{"id":40726,"date":"2025-08-08T16:20:24","date_gmt":"2025-08-08T09:20:24","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=40726"},"modified":"2025-08-08T20:07:19","modified_gmt":"2025-08-08T13:07:19","slug":"50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/","title":{"rendered":"50+ b\u00e0i t\u1eadp to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 \u0111\u00e1p \u00e1n c\u00f9ng b\u00e9 \u00f4n t\u1eadp hi\u1ec7u qu\u1ea3"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Tam_quan_trong_khi_giai_toan_lop_2_nang_cao\" >T\u1ea7m quan tr\u1ecdng khi gi\u1ea3i to\u00e1n l\u1edbp 2 n\u00e2ng cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Cac_dang_toan_nang_cao_lop_2\" >C\u00e1c d\u1ea1ng to\u00e1n n\u00e2ng cao l\u1edbp 2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#200_bai_toan_nang_cao_lop_2_co_loi_giai_de_be_luyen_tap\" >200+ b\u00e0i to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ec3 b\u00e9 luy\u1ec7n t\u1eadp<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_tap_doc_viet_so_sanh_cac_so_trong_pham_vi_100_toan_lop_2\" >B\u00e0i t\u1eadp \u0111\u1ecdc, vi\u1ebft, so s\u00e1nh c\u00e1c s\u1ed1 trong ph\u1ea1m vi 100 to\u00e1n l\u1edbp 2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_toan_cong_tru_co_nho_toan_lop_2_trong_pham_vi_100\" >B\u00e0i to\u00e1n c\u1ed9ng, tr\u1eeb c\u00f3 nh\u1edb to\u00e1n l\u1edbp 2 trong ph\u1ea1m vi 100<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_tap_nang_cao_toan_lop_2_ve_phep_nhan_chia_toan\" >B\u00e0i t\u1eadp n\u00e2ng cao to\u00e1n l\u1edbp 2 v\u1ec1 ph\u00e9p nh\u00e2n, chia to\u00e1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_tap_tinh_nham_tinh_nhanh_lop_2_nang_cao\" >B\u00e0i t\u1eadp t\u00ednh nh\u1ea9m, t\u00ednh nhanh l\u1edbp 2 n\u00e2ng cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_toan_co_loi_van_lop_2_co_dap_an\" >B\u00e0i to\u00e1n c\u00f3 l\u1eddi v\u0103n l\u1edbp 2 c\u00f3 \u0111\u00e1p \u00e1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_tap_doc_viet_va_so_sanh_cac_so_co_3_chu_so_toan_lop_2_nang_cao\" >B\u00e0i t\u1eadp \u0111\u1ecdc, vi\u1ebft v\u00e0 so s\u00e1nh c\u00e1c s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 to\u00e1n l\u1edbp 2 n\u00e2ng cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Huong_dan_giai_bai_toan_don_vi_do_do_dai_lop_2_nang_cao\" >H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i to\u00e1n \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i l\u1edbp 2 n\u00e2ng cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bai_toan_do_lop_2_luyen_tu_duy\" >B\u00e0i to\u00e1n \u0111\u1ed1 l\u1edbp 2 luy\u1ec7n t\u01b0 duy<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Bi_quyet_giup_be_lam_bai_tap_toan_nang_cao_lop_2_hieu_qua\" >B\u00ed quy\u1ebft gi\u00fap b\u00e9 l\u00e0m b\u00e0i t\u1eadp to\u00e1n n\u00e2ng cao l\u1edbp 2 hi\u1ec7u qu\u1ea3<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Tao_nen_tang_hoc_toan_lop_2_nang_cao_cung_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\" >T\u1ea1o n\u1ec1n t\u1ea3ng h\u1ecdc to\u00e1n l\u1edbp 2 n\u00e2ng cao c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Cho_cac_con_lam_bai_tap_thuong_xuyen_moi_ngay\" >Cho c\u00e1c con l\u00e0m b\u00e0i t\u1eadp th\u01b0\u1eddng xuy\u00ean m\u1ed7i ng\u00e0y<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Cho_con_tham_gia_vao_cac_cuoc_thi\" >Cho con tham gia v\u00e0o c\u00e1c cu\u1ed9c thi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Cho_con_on_tap_theo_cac_giai_doan\" >Cho con \u00f4n t\u1eadp theo c\u00e1c giai \u0111o\u1ea1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Cho_cac_ban_nho_luyen_them_nhieu_de_toan_nang_cao_lop_2\" >Cho c\u00e1c b\u1ea1n nh\u1ecf luy\u1ec7n th\u00eam nhi\u1ec1u \u0111\u1ec1 to\u00e1n n\u00e2ng cao l\u1edbp 2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Khong_nen_tao_cho_be_su_ap_luc\" >Kh\u00f4ng n\u00ean t\u1ea1o cho b\u00e9 s\u1ef1 \u00e1p l\u1ef1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Giup_cho_be_nam_chac_kien_thuc_co_ban\" >Gi\u00fap cho b\u00e9 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.ckconitsha.com\/vn\/50-bai-tap-toan-nang-cao-lop-2-co-dap-an-cung-be-on-tap-hieu-qua\/#Phu_huynh_nen_danh_gia_nang_luc_de_chon_cho_con_chuong_trinh_hoc_phu_hop\" >Ph\u1ee5 huynh n\u00ean \u0111\u00e1nh gi\u00e1 n\u0103ng l\u1ef1c \u0111\u1ec3 ch\u1ecdn cho con ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc ph\u00f9 h\u1ee3p<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>T\u1ed5ng h\u1ee3p c\u00e1c b\u00e0i t\u1eadp\u00a0to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 \u0111\u00e1p \u00e1n c\u00f9ng nhi\u1ec1u b\u00ed quy\u1ebft gi\u00fap b\u00e9 chinh ph\u1ee5c ki\u1ebfn th\u1ee9c n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. H\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef t\u00ecm hi\u1ec3u r\u00f5 h\u01a1n ngay trong b\u00e0i vi\u1ebft sau \u0111\u00e2y nh\u00e9.<\/p>\n<p>                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/image\/600x480_(1).png\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tam_quan_trong_khi_giai_toan_lop_2_nang_cao\"><\/span>T\u1ea7m quan tr\u1ecdng khi gi\u1ea3i to\u00e1n l\u1edbp 2 n\u00e2ng cao<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Sau khi \u0111\u00e3 trang b\u1ecb \u0111\u01b0\u1ee3c ch\u01b0\u01a1ng tr\u00ecnh ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n th\u00ec c\u00e1c b\u1eadc ph\u1ee5 huynh c\u0169ng n\u00ean h\u01b0\u1edbng \u0111\u1ebfn vi\u1ec7c cho b\u00e9 h\u1ecdc to\u00e1n n\u00e2ng cao. \u1ede to\u00e1n l\u1edbp 2, vi\u1ec7c h\u1ecdc ki\u1ebfn th\u1ee9c n\u00e2ng cao s\u1ebd c\u00f3 r\u1ea5t nhi\u1ec1u l\u1ee3i \u00edch \u0111\u1ed1i v\u1edbi c\u00e1c b\u1ea1n nh\u1ecf nh\u01b0:<\/p>\n<ul data-start=\"0\" data-end=\"791\" data-is-last-node=\"\" data-is-only-node=\"\">\n<li class=\"\" data-start=\"0\" data-end=\"60\">\n<p class=\"\" data-start=\"2\" data-end=\"60\">Ph\u00e1t tri\u1ec3n t\u01b0 duy logic v\u00e0 kh\u1ea3 n\u0103ng ph\u00e2n t\u00edch th\u00f4ng tin.<\/p>\n<\/li>\n<li class=\"\" data-start=\"61\" data-end=\"135\">\n<p class=\"\" data-start=\"63\" data-end=\"135\">R\u00e8n luy\u1ec7n k\u1ef9 n\u0103ng suy lu\u1eadn v\u00e0 l\u1eadp lu\u1eadn ch\u1eb7t ch\u1ebd khi gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1.<\/p>\n<\/li>\n<li class=\"\" data-start=\"136\" data-end=\"213\">\n<p class=\"\" data-start=\"138\" data-end=\"213\">C\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n th\u00f4ng qua vi\u1ec7c \u00e1p d\u1ee5ng v\u00e0o c\u00e1c b\u00e0i to\u00e1n kh\u00f3 h\u01a1n.<\/p>\n<\/li>\n<li class=\"\" data-start=\"214\" data-end=\"295\">\n<p class=\"\" data-start=\"216\" data-end=\"295\">M\u1edf r\u1ed9ng hi\u1ec3u bi\u1ebft v\u00e0 l\u00e0m quen v\u1edbi c\u00e1c d\u1ea1ng to\u00e1n \u0111a d\u1ea1ng ngo\u00e0i s\u00e1ch gi\u00e1o khoa.<\/p>\n<\/li>\n<li class=\"\" data-start=\"296\" data-end=\"377\">\n<p class=\"\" data-start=\"298\" data-end=\"377\">Gi\u00fap h\u1ecdc sinh t\u0103ng kh\u1ea3 n\u0103ng t\u1eadp trung v\u00e0 ki\u00ean nh\u1eabn khi \u0111\u1ed1i m\u1eb7t v\u1edbi th\u1eed th\u00e1ch.<\/p>\n<\/li>\n<li class=\"\" data-start=\"378\" data-end=\"459\">\n<p class=\"\" data-start=\"380\" data-end=\"459\">T\u1ea1o c\u1ea3m gi\u00e1c h\u1ee9ng th\u00fa, y\u00eau th\u00edch m\u00f4n to\u00e1n khi h\u1ecdc sinh v\u01b0\u1ee3t qua b\u00e0i to\u00e1n kh\u00f3.<\/p>\n<\/li>\n<li class=\"\" data-start=\"460\" data-end=\"535\">\n<p class=\"\" data-start=\"462\" data-end=\"535\">X\u00e2y d\u1ef1ng s\u1ef1 t\u1ef1 tin trong h\u1ecdc t\u1eadp, \u0111\u1eb7c bi\u1ec7t l\u00e0 v\u1edbi c\u00e1c em c\u00f3 n\u0103ng khi\u1ebfu.<\/p>\n<\/li>\n<li class=\"\" data-start=\"536\" data-end=\"619\">\n<p class=\"\" data-start=\"538\" data-end=\"619\">Chu\u1ea9n b\u1ecb n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc cho c\u00e1c k\u1ef3 thi h\u1ecdc sinh gi\u1ecfi ho\u1eb7c thi v\u00e0o l\u1edbp ch\u1ecdn.<\/p>\n<\/li>\n<li class=\"\" data-start=\"620\" data-end=\"698\">\n<p class=\"\" data-start=\"622\" data-end=\"698\">H\u1ed7 tr\u1ee3 ph\u00e1t tri\u1ec3n n\u0103ng l\u1ef1c h\u1ecdc t\u1eadp l\u00e2u d\u00e0i, kh\u00f4ng ch\u1ec9 gi\u1edbi h\u1ea1n \u1edf m\u00f4n to\u00e1n.<\/p>\n<\/li>\n<li class=\"\" data-start=\"699\" data-end=\"791\">\n<p class=\"\" data-start=\"701\" data-end=\"791\">T\u1ea1o th\u00f3i quen suy ngh\u0129 c\u00f3 h\u1ec7 th\u1ed1ng v\u00e0 bi\u1ebft c\u00e1ch ti\u1ebfp c\u1eadn v\u1ea5n \u0111\u1ec1 t\u1eeb nhi\u1ec1u g\u00f3c \u0111\u1ed9 kh\u00e1c nhau.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/1-toan-lop-2-nang-cao-co-loi-giai.jpg\" alt=\"To\u00e1n n\u00e2ng cao l\u1edbp 2 quan tr\u1ecdng nh\u01b0 th\u1ebf n\u00e0o? (Ngu\u1ed3n \u1ea3nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac_dang_toan_nang_cao_lop_2\"><\/span>C\u00e1c d\u1ea1ng to\u00e1n n\u00e2ng cao l\u1edbp 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To\u00e1n kh\u00f3 l\u1edbp 2 bao g\u1ed3m c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp kh\u00f3 h\u01a1n so v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n, gi\u00fap h\u1ecdc sinh ph\u00e1t tri\u1ec3n t\u01b0 duy logic, kh\u1ea3 n\u0103ng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 v\u00e0 r\u00e8n luy\u1ec7n k\u1ef9 n\u0103ng t\u00ednh to\u00e1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 d\u1ea1ng th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n trong \u0111\u1ec1 to\u00e1n l\u1edbp 2 n\u00e2ng cao:<\/p>\n<p class=\"\" data-start=\"370\" data-end=\"389\">1. So s\u00e1nh s\u1ed1<\/p>\n<ul data-start=\"390\" data-end=\"722\">\n<li class=\"\" data-start=\"390\" data-end=\"525\">\n<p class=\"\" data-start=\"392\" data-end=\"525\">So s\u00e1nh c\u00e1c s\u1ed1 c\u00f3 m\u1ed9t, hai ho\u1eb7c ba ch\u1eef s\u1ed1 trong ph\u1ea1m vi 1000.<em data-start=\"458\" data-end=\"466\">V\u00ed d\u1ee5:<\/em> S\u1ed1 n\u00e0o l\u1edbn h\u01a1n: 237 hay 273? \u2192 Tr\u1ea3 l\u1eddi: 273 l\u1edbn h\u01a1n 237.<\/p>\n<\/li>\n<li class=\"\" data-start=\"526\" data-end=\"628\">\n<p class=\"\" data-start=\"528\" data-end=\"628\">So s\u00e1nh s\u1ed1 ch\u1eb5n v\u00e0 s\u1ed1 l\u1ebb.<em data-start=\"558\" data-end=\"566\">V\u00ed d\u1ee5:<\/em> 48 l\u00e0 s\u1ed1 ch\u1eb5n, c\u00f2n 35 l\u00e0 s\u1ed1 l\u1ebb. So s\u00e1nh 48 v\u00e0 35 \u2192 48 &gt; 35.<\/p>\n<\/li>\n<li class=\"\" data-start=\"629\" data-end=\"722\">\n<p class=\"\" data-start=\"631\" data-end=\"722\">Nh\u1eadn bi\u1ebft s\u1ed1 l\u1edbn h\u01a1n, b\u00e9 h\u01a1n ho\u1eb7c b\u1eb1ng nhau.<em data-start=\"680\" data-end=\"688\">V\u00ed d\u1ee5:<\/em> So s\u00e1nh: 99 ___ 100 \u2192 \u0110i\u1ec1n d\u1ea5u &lt;.<\/p>\n<\/li>\n<\/ul>\n<p class=\"\" data-start=\"724\" data-end=\"742\">2. Ph\u00e9p t\u00ednh<\/p>\n<ul data-start=\"743\" data-end=\"1018\">\n<li class=\"\" data-start=\"743\" data-end=\"829\">\n<p class=\"\" data-start=\"745\" data-end=\"829\">C\u1ed9ng, tr\u1eeb c\u00f3 nh\u1edb trong ph\u1ea1m vi 100.<em data-start=\"785\" data-end=\"793\">V\u00ed d\u1ee5:<\/em> 67 + 28 = ? \u2192 T\u00ednh: 67 + 28 = 95.<\/p>\n<\/li>\n<li class=\"\" data-start=\"830\" data-end=\"899\">\n<p class=\"\" data-start=\"832\" data-end=\"899\">Nh\u00e2n, chia trong ph\u1ea1m vi 20.<em data-start=\"865\" data-end=\"873\">V\u00ed d\u1ee5:<\/em> 4 \u00d7 5 = 20, 18 \u00f7 3 = 6.<\/p>\n<\/li>\n<li class=\"\" data-start=\"900\" data-end=\"1018\">\n<p class=\"\" data-start=\"902\" data-end=\"1018\">T\u00ednh nh\u1ea9m, t\u00ednh nhanh c\u00e1c ph\u00e9p to\u00e1n c\u01a1 b\u1ea3n.<em data-start=\"950\" data-end=\"958\">V\u00ed d\u1ee5:<\/em> 19 + 21 \u2013 20 = ? \u2192 T\u00ednh nh\u1ea9m: (19 + 21 = 40), 40 \u2013 20 = 20.<\/p>\n<\/li>\n<\/ul>\n<p class=\"\" data-start=\"1020\" data-end=\"1048\">3. B\u00e0i to\u00e1n c\u00f3 l\u1eddi v\u0103n<\/p>\n<ul data-start=\"1049\" data-end=\"1650\">\n<li class=\"\" data-start=\"1049\" data-end=\"1185\">\n<p class=\"\" data-start=\"1051\" data-end=\"1185\">C\u00e1c b\u00e0i to\u00e1n v\u1ec1 c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia.<em data-start=\"1094\" data-end=\"1102\">V\u00ed d\u1ee5:<\/em> Lan c\u00f3 24 c\u00e1i k\u1eb9o, chia \u0111\u1ec1u cho 4 b\u1ea1n. M\u1ed7i b\u1ea1n \u0111\u01b0\u1ee3c m\u1ea5y c\u00e1i? \u2192 24 \u00f7 4 = 6 (c\u00e1i).<\/p>\n<\/li>\n<li class=\"\" data-start=\"1186\" data-end=\"1359\">\n<p class=\"\" data-start=\"1188\" data-end=\"1359\">B\u00e0i to\u00e1n v\u1ec1 \u0111o l\u01b0\u1eddng: \u0111\u1ed9 d\u00e0i, th\u1eddi gian, kh\u1ed1i l\u01b0\u1ee3ng.<em data-start=\"1245\" data-end=\"1253\">V\u00ed d\u1ee5:<\/em> M\u1ed9t c\u00e2y b\u00fat d\u00e0i 15 cm, c\u00e2y th\u01b0\u1edbc d\u00e0i h\u01a1n c\u00e2y b\u00fat 10 cm. H\u1ecfi c\u00e2y th\u01b0\u1edbc d\u00e0i bao nhi\u00eau? \u2192 15 + 10 = 25 cm.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1360\" data-end=\"1507\">\n<p class=\"\" data-start=\"1362\" data-end=\"1507\">Nh\u1eadn bi\u1ebft h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n: h\u00ecnh vu\u00f4ng, h\u00ecnh tr\u00f2n, h\u00ecnh tam gi\u00e1c, h\u00ecnh ch\u1eef nh\u1eadt.<em data-start=\"1446\" data-end=\"1454\">V\u00ed d\u1ee5:<\/em> H\u00ecnh c\u00f3 4 c\u1ea1nh b\u1eb1ng nhau l\u00e0 h\u00ecnh g\u00ec? \u2192 H\u00ecnh vu\u00f4ng.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1508\" data-end=\"1650\">\n<p class=\"\" data-start=\"1510\" data-end=\"1650\">B\u00e0i to\u00e1n logic, gi\u1ea3i tr\u00ed.<em data-start=\"1540\" data-end=\"1548\">V\u00ed d\u1ee5:<\/em> C\u00f3 3 con m\u00e8o, m\u1ed7i con b\u1eaft \u0111\u01b0\u1ee3c 3 con chu\u1ed9t. H\u1ecfi t\u1ea5t c\u1ea3 b\u1eaft \u0111\u01b0\u1ee3c bao nhi\u00eau con chu\u1ed9t? \u2192 3 \u00d7 3 = 9 con.<\/p>\n<\/li>\n<\/ul>\n<p class=\"\" data-start=\"1652\" data-end=\"1691\">4. M\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n n\u00e2ng cao kh\u00e1c<\/p>\n<p>\u00a0<\/p>\n<ul data-start=\"1692\" data-end=\"2069\">\n<li class=\"\" data-start=\"1692\" data-end=\"1800\">\n<p class=\"\" data-start=\"1694\" data-end=\"1800\">So s\u00e1nh c\u00e1c s\u1ed1 th\u1eadp ph\u00e2n \u0111\u01a1n gi\u1ea3n (n\u1ebfu h\u1ecdc sinh \u0111\u00e3 l\u00e0m quen).<em data-start=\"1760\" data-end=\"1768\">V\u00ed d\u1ee5:<\/em> 1,2 v\u00e0 1,5 \u2192 1,5 l\u1edbn h\u01a1n 1,2.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1801\" data-end=\"1875\">\n<p class=\"\" data-start=\"1803\" data-end=\"1875\">T\u00ednh to\u00e1n v\u1edbi s\u1ed1 th\u1eadp ph\u00e2n \u1edf m\u1ee9c c\u01a1 b\u1ea3n.<em data-start=\"1848\" data-end=\"1856\">V\u00ed d\u1ee5:<\/em> 1,5 + 0,5 = 2,0.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1876\" data-end=\"1961\">\n<p class=\"\" data-start=\"1878\" data-end=\"1961\">L\u00e0m quen v\u1edbi ph\u00e2n s\u1ed1: nh\u1eadn bi\u1ebft v\u00e0 so s\u00e1nh.<em data-start=\"1926\" data-end=\"1934\">V\u00ed d\u1ee5:<\/em> Ph\u00e2n s\u1ed1 1\/2 l\u1edbn h\u01a1n 1\/4.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1962\" data-end=\"2069\">\n<p class=\"\" data-start=\"1964\" data-end=\"2069\">To\u00e1n t\u01b0 duy logic, t\u00ecm quy lu\u1eadt.<em data-start=\"2001\" data-end=\"2009\">V\u00ed d\u1ee5:<\/em> D\u00e3y s\u1ed1: 2, 4, 6, 8, &#8230; \u2192 S\u1ed1 ti\u1ebfp theo l\u00e0 10 (t\u0103ng th\u00eam 2).<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"200_bai_toan_nang_cao_lop_2_co_loi_giai_de_be_luyen_tap\"><\/span>200+ b\u00e0i to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ec3 b\u00e9 luy\u1ec7n t\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c b\u00e0i to\u00e1n n\u00e2ng cao l\u1edbp 2 k\u00ec 1 c\u00f3 l\u1eddi gi\u1ea3i, v\u1edbi \u0111a d\u1ea1ng d\u1ea1ng to\u00e1n kh\u00e1c nhau \u0111\u1ec3 b\u00e9 luy\u1ec7n t\u1eadp h\u1ed7 tr\u1ee3 b\u1ed3i d\u01b0\u1ee1ng luy\u1ec7n thi h\u1ecdc sinh gi\u1ecfi hay h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_doc_viet_so_sanh_cac_so_trong_pham_vi_100_toan_lop_2\"><\/span>B\u00e0i t\u1eadp \u0111\u1ecdc, vi\u1ebft, so s\u00e1nh c\u00e1c s\u1ed1 trong ph\u1ea1m vi 100 to\u00e1n l\u1edbp 2<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: \u0110\u1ecdc c\u00e1c s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn: 47: B\u1ed1n m\u01b0\u01a1i b\u1ea3y<\/p>\n<p dir=\"ltr\">19:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.; 82:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.; 33:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">65:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.; 78:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.; 24:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Vi\u1ebft c\u00e1c s\u1ed1 g\u1ed3m:<\/p>\n<p dir=\"ltr\">a. 3 ch\u1ee5c v\u00e0 4 \u0111\u01a1n v\u1ecb: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">b. 2 tr\u0103m 0 ch\u1ee5c v\u00e0 0 \u0111\u01a1n v\u1ecb: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 5: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u00e0 4: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">e. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb kh\u00e1c nhau: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u1eeb 3 ch\u1eef s\u1ed1 2, 4, 7 em h\u00e3y vi\u1ebft t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">C\u00f3 bao nhi\u00eau s\u1ed1 nh\u01b0 v\u1eady?<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">B\u00e0i 4:<\/p>\n<p dir=\"ltr\">a. C\u00f3 bao nhi\u00eau s\u1ed1 c\u00f3 m\u1ed9t ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">b. C\u00f3 bao nhi\u00eau s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">c. T\u1eeb 37 \u0111\u1ebfn 89 c\u00f3 bao nhi\u00eau s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">B\u00e0i 5:<\/p>\n<p dir=\"ltr\">a. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, c\u00f3 t\u1ed5ng ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb b\u1eb1ng 9:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u1edbn h\u01a1n ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb 3 \u0111\u01a1n v\u1ecb:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">B\u00e0i 6: B\u00e0i t\u1eadp to\u00e1n l\u1edbp 2 t\u00ecm X c\u00f3 hai ch\u1eef s\u1ed1, bi\u1ebft:<\/p>\n<p dir=\"ltr\">a. X &lt; 30: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. X &gt; 75: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">B\u00e0i 7: Trong c\u00e1c s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 30, c\u00f3 bao nhi\u00eau:<\/p>\n<p dir=\"ltr\">a. Ch\u1eef s\u1ed1 0: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">b. Ch\u1eef s\u1ed1 2: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">c. Ch\u1eef s\u1ed1 3: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">B\u00e0i 8: Em h\u00e3y vi\u1ebft:<\/p>\n<p dir=\"ltr\">a. S\u1ed1 b\u00e9 nh\u1ea5t c\u00f3 m\u1ed9t ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">b. S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 m\u1ed9t ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. S\u1ed1 b\u00e9 nh\u1ea5t c\u00f3 hai ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 hai ch\u1eef s\u1ed1: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">B\u00e0i 9: So s\u00e1nh c\u00e1c c\u1eb7p s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn: 56 &gt; 34<\/p>\n<p dir=\"ltr\">a. 78 v\u00e0 89: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">b. 45 v\u00e0 54: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">c. 23 v\u00e0 32: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">d. 67 v\u00e0 76: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">B\u00e0i 10: T\u00ecm s\u1ed1 l\u1edbn nh\u1ea5t v\u00e0 s\u1ed1 b\u00e9 nh\u1ea5t trong c\u00e1c nh\u00f3m s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">a. 12, 34, 56, 78, 90:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">b. 65, 43, 29, 81, 54:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">c. 19, 28, 37, 46, 55:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">B\u00e0i 11: Vi\u1ebft c\u00e1c s\u1ed1 ch\u1eb5n t\u1eeb 10 \u0111\u1ebfn 50:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">B\u00e0i 12: Vi\u1ebft c\u00e1c s\u1ed1 l\u1ebb t\u1eeb 15 \u0111\u1ebfn 35:<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n<\/p>\n<p dir=\"ltr\">B\u00e0i 1: \u0110\u1ecdc c\u00e1c s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn: 47: B\u1ed1n m\u01b0\u01a1i b\u1ea3y<\/p>\n<p dir=\"ltr\">19: M\u01b0\u1eddi ch\u00edn; 82: T\u00e1m m\u01b0\u01a1i hai; 33: Ba m\u01b0\u01a1i ba<\/p>\n<p dir=\"ltr\">65: S\u00e1u m\u01b0\u01a1i l\u0103m; 78: B\u1ea3y m\u01b0\u01a1i t\u00e1m; 24: Hai m\u01b0\u01a1i b\u1ed1n<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Vi\u1ebft c\u00e1c s\u1ed1 g\u1ed3m:<\/p>\n<p dir=\"ltr\">a. 3 ch\u1ee5c v\u00e0 4 \u0111\u01a1n v\u1ecb: 34<\/p>\n<p dir=\"ltr\">b. 2 tr\u0103m 0 ch\u1ee5c v\u00e0 0 \u0111\u01a1n v\u1ecb: 200<\/p>\n<p dir=\"ltr\">c. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 5: 15, 25, 35, 45, 55, 65, 75, 85, 95<\/p>\n<p dir=\"ltr\">d. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u00e0 4: 40, 41, 42, 43, 44, 45, 46, 47, 48, 49<\/p>\n<p dir=\"ltr\">e. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb kh\u00e1c nhau: 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99.<\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u1eeb 3 ch\u1eef s\u1ed1 2, 4, 7 em h\u00e3y vi\u1ebft t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1:<\/p>\n<p dir=\"ltr\">24, 27, 42, 47, 72, 74<\/p>\n<p dir=\"ltr\">C\u00f3 6 s\u1ed1 nh\u01b0 v\u1eady.<\/p>\n<p dir=\"ltr\">B\u00e0i 4:<\/p>\n<p dir=\"ltr\">a. C\u00f3 bao nhi\u00eau s\u1ed1 c\u00f3 m\u1ed9t ch\u1eef s\u1ed1: 9 (c\u00e1c s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 9)<\/p>\n<p dir=\"ltr\">b. C\u00f3 bao nhi\u00eau s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1: 90 (c\u00e1c s\u1ed1 t\u1eeb 10 \u0111\u1ebfn 99)<\/p>\n<p dir=\"ltr\">c. T\u1eeb 37 \u0111\u1ebfn 89 c\u00f3 bao nhi\u00eau s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1: 53 s\u1ed1 (t\u1eeb 37 \u0111\u1ebfn 89 c\u00f3 t\u1ed5ng c\u1ed9ng 53 s\u1ed1, bao g\u1ed3m c\u1ea3 37 v\u00e0 89)<\/p>\n<p dir=\"ltr\">B\u00e0i 5:<\/p>\n<p dir=\"ltr\">a. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, c\u00f3 t\u1ed5ng ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb b\u1eb1ng 9:<\/p>\n<p dir=\"ltr\">18, 27, 36, 45, 54, 63, 72, 81, 90<\/p>\n<p dir=\"ltr\">b. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u1edbn h\u01a1n ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb 3 \u0111\u01a1n v\u1ecb:<\/p>\n<p dir=\"ltr\">41, 52, 63, 74, 85, 96<\/p>\n<p dir=\"ltr\">B\u00e0i 6: T\u00ecm X c\u00f3 hai ch\u1eef s\u1ed1, bi\u1ebft:<\/p>\n<p dir=\"ltr\">a. X &lt; 30: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29<\/p>\n<p dir=\"ltr\">b. X &gt; 75: 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99<\/p>\n<p dir=\"ltr\">B\u00e0i 7: Trong c\u00e1c s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 30, c\u00f3 bao nhi\u00eau:<\/p>\n<p dir=\"ltr\">a. Ch\u1eef s\u1ed1 0: 3 (10, 20, 30)<\/p>\n<p dir=\"ltr\">b. Ch\u1eef s\u1ed1 2: 13 (2, 12, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)<\/p>\n<p dir=\"ltr\">c. Ch\u1eef s\u1ed1 3: 13 (3, 13, 23, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)<\/p>\n<p dir=\"ltr\">B\u00e0i 8: Em h\u00e3y vi\u1ebft:<\/p>\n<p dir=\"ltr\">a. S\u1ed1 b\u00e9 nh\u1ea5t c\u00f3 m\u1ed9t ch\u1eef s\u1ed1: 1<\/p>\n<p dir=\"ltr\">b. S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 m\u1ed9t ch\u1eef s\u1ed1: 9<\/p>\n<p dir=\"ltr\">c. S\u1ed1 b\u00e9 nh\u1ea5t c\u00f3 hai ch\u1eef s\u1ed1: 10<\/p>\n<p dir=\"ltr\">d. S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 hai ch\u1eef s\u1ed1: 99<\/p>\n<p dir=\"ltr\">B\u00e0i 9: So s\u00e1nh c\u00e1c c\u1eb7p s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">a. 78 v\u00e0 89: 78 &lt; 89<\/p>\n<p dir=\"ltr\">b. 45 v\u00e0 54: 45 &lt; 54<\/p>\n<p dir=\"ltr\">c. 23 v\u00e0 32: 23 &lt; 32<\/p>\n<p dir=\"ltr\">d. 67 v\u00e0 76: 67 &lt; 76<\/p>\n<p dir=\"ltr\">B\u00e0i 10: T\u00ecm s\u1ed1 l\u1edbn nh\u1ea5t v\u00e0 s\u1ed1 b\u00e9 nh\u1ea5t trong c\u00e1c nh\u00f3m s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">a. 12, 34, 56, 78, 90:<\/p>\n<ul>\n<li dir=\"ltr\">S\u1ed1 l\u1edbn nh\u1ea5t: 90<\/li>\n<li dir=\"ltr\">S\u1ed1 b\u00e9 nh\u1ea5t: 12<\/li>\n<\/ul>\n<p dir=\"ltr\">b. 65, 43, 29, 81, 54:<\/p>\n<ul>\n<li dir=\"ltr\">S\u1ed1 l\u1edbn nh\u1ea5t: 81<\/li>\n<li dir=\"ltr\">S\u1ed1 b\u00e9 nh\u1ea5t: 29<\/li>\n<\/ul>\n<p dir=\"ltr\">c. 19, 28, 37, 46, 55:<\/p>\n<ul>\n<li dir=\"ltr\">S\u1ed1 l\u1edbn nh\u1ea5t: 55<\/li>\n<li dir=\"ltr\">S\u1ed1 b\u00e9 nh\u1ea5t: 19<\/li>\n<\/ul>\n<p dir=\"ltr\">B\u00e0i 11: Vi\u1ebft c\u00e1c s\u1ed1 ch\u1eb5n t\u1eeb 10 \u0111\u1ebfn 50:<\/p>\n<p dir=\"ltr\">10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50<\/p>\n<p dir=\"ltr\">B\u00e0i 12: Vi\u1ebft c\u00e1c s\u1ed1 l\u1ebb t\u1eeb 15 \u0111\u1ebfn 35:<\/p>\n<p dir=\"ltr\">15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_toan_cong_tru_co_nho_toan_lop_2_trong_pham_vi_100\"><\/span>B\u00e0i to\u00e1n c\u1ed9ng, tr\u1eeb c\u00f3 nh\u1edb to\u00e1n l\u1edbp 2 trong ph\u1ea1m vi 100<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: \u0110\u1eb7t t\u00ednh r\u1ed3i t\u00ednh:<\/p>\n<p dir=\"ltr\">72 \u2013 29<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">15 + 38<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">86 \u2013 78<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">72 &#8211; 29 = 43<\/p>\n<p dir=\"ltr\">15 + 38 = 53<\/p>\n<p dir=\"ltr\">86 &#8211; 78 = 8<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh:<\/p>\n<p dir=\"ltr\">a. 52 + 18 \u2013 33 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 72 \u2013 16 \u2013 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 31 \u2013 9 + 28 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 52 + 18 \u2013 33 = 70 &#8211; 33 = 37<\/p>\n<p dir=\"ltr\">b. 72 \u2013 16 \u2013 5 = 56 &#8211; 5 = 51<\/p>\n<p dir=\"ltr\">c. 31 \u2013 9 + 28 = 22 + 28 = 50<\/p>\n<p dir=\"ltr\">B\u00e0i 3: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m:<\/p>\n<p dir=\"ltr\">9 + \u2026.. \u2013 \u2026.. = 15<\/p>\n<p dir=\"ltr\">\u2026.. \u2013 12 + \u2026.. = 8<\/p>\n<p dir=\"ltr\">\u2026.. + \u2026.. \u2013 7 = 13<\/p>\n<p dir=\"ltr\">16 \u2013 \u2026.. \u2013 \u2026.. = 12<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">9 + 7 \u2013 1 = 15<\/p>\n<p dir=\"ltr\">20 \u2013 12 + 0 = 8<\/p>\n<p dir=\"ltr\">10 + 10 \u2013 7 = 13<\/p>\n<p dir=\"ltr\">16 \u2013 2 \u2013 2 = 12<\/p>\n<p dir=\"ltr\">B\u00e0i 4: T\u00ecm x, bi\u1ebft:<\/p>\n<p dir=\"ltr\">a. x \u2013 29 = 12<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 15 + x = 52<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 86 \u2013 x = 28<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. x \u2013 29 = 12<\/p>\n<p dir=\"ltr\">x = 12 + 29<\/p>\n<p dir=\"ltr\">x = 41<\/p>\n<p dir=\"ltr\">b. 15 + x = 52<\/p>\n<p dir=\"ltr\">x = 52 \u2013 15<\/p>\n<p dir=\"ltr\">x = 37<\/p>\n<p dir=\"ltr\">c. 86 \u2013 x = 28<\/p>\n<p dir=\"ltr\">x = 86 \u2013 28<\/p>\n<p dir=\"ltr\">x = 58<\/p>\n<p dir=\"ltr\">B\u00e0i 5: T\u00ecm s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 hai ch\u1eef s\u1ed1 m\u00e0 t\u1ed5ng hai ch\u1eef s\u1ed1 b\u1eb1ng 15:<\/p>\n<p dir=\"ltr\">A. 78<\/p>\n<p dir=\"ltr\">B. 87<\/p>\n<p dir=\"ltr\">C. 96<\/p>\n<p dir=\"ltr\">D. 99<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 hai ch\u1eef s\u1ed1 m\u00e0 t\u1ed5ng hai ch\u1eef s\u1ed1 b\u1eb1ng 15 l\u00e0 96 (9 + 6 = 15).<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 96<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_nang_cao_toan_lop_2_ve_phep_nhan_chia_toan\"><\/span>B\u00e0i t\u1eadp n\u00e2ng cao to\u00e1n l\u1edbp 2 v\u1ec1 ph\u00e9p nh\u00e2n, chia to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh:<\/p>\n<p dir=\"ltr\">a. 2 x 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 3 x 6 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 4 x 7 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 5 x 7 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 2 x 5 = 10<\/p>\n<p dir=\"ltr\">b. 3 x 6 = 18<\/p>\n<p dir=\"ltr\">c. 4 x 7 = 28<\/p>\n<p dir=\"ltr\">d. 5 x 7 = 35<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh:<\/p>\n<p dir=\"ltr\">a. 35 : 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 18 : 3 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 24 : 4 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 14 : 2 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 35 : 5 = 7<\/p>\n<p dir=\"ltr\">b. 18 : 3 = 6<\/p>\n<p dir=\"ltr\">c. 24 : 4 = 6<\/p>\n<p dir=\"ltr\">d. 14 : 2 = 7<\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u00ecm hai s\u1ed1 c\u00f3 t\u00edch b\u1eb1ng 0 v\u00e0 c\u00f3 t\u1ed5ng b\u1eb1ng 8.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">Hai s\u1ed1 \u0111\u00f3 l\u00e0 0 v\u00e0 8.<\/p>\n<p dir=\"ltr\">B\u00e0i 4: T\u00ecm s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 sao cho s\u1ed1 h\u00e0ng ch\u1ee5c chia cho s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 b\u1eb1ng 3.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 \u0111\u00f3 l\u00e0 36 (3 chia cho 6 \u0111\u01b0\u1ee3c 0.5 nh\u01b0ng 6 chia cho 3 \u0111\u01b0\u1ee3c 2)<\/p>\n<p dir=\"ltr\">B\u00e0i 5: T\u00ecm hai s\u1ed1 t\u00edch b\u1eb1ng 8 v\u00e0 c\u00f3 hi\u1ec7u b\u1eb1ng 2.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">Hai s\u1ed1 \u0111\u00f3 l\u00e0 4 v\u00e0 2 (4 x 2 = 8 v\u00e0 4 &#8211; 2 = 2)<\/p>\n<p dir=\"ltr\">B\u00e0i 6: Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh:<\/p>\n<p dir=\"ltr\">a. 6 x 4 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 7 x 3 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 8 x 2 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 9 x 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 6 x 4 = 24<\/p>\n<p dir=\"ltr\">b. 7 x 3 = 21<\/p>\n<p dir=\"ltr\">c. 8 x 2 = 16<\/p>\n<p dir=\"ltr\">d. 9 x 5 = 45<\/p>\n<p dir=\"ltr\">B\u00e0i 7: Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh:<\/p>\n<p dir=\"ltr\">a. 20 : 4 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 16 : 2 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 45 : 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 28 : 7 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 20 : 4 = 5<\/p>\n<p dir=\"ltr\">b. 16 : 2 = 8<\/p>\n<p dir=\"ltr\">c. 45 : 5 = 9<\/p>\n<p dir=\"ltr\">d. 28 : 7 = 4<\/p>\n<p dir=\"ltr\">B\u00e0i 8: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a. 3 x \u2026 = 21<\/p>\n<p dir=\"ltr\">b. \u2026 x 4 = 32<\/p>\n<p dir=\"ltr\">c. 9 x \u2026 = 27<\/p>\n<p dir=\"ltr\">d. \u2026 x 6 = 54<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 3 x 7 = 21<\/p>\n<p dir=\"ltr\">b. 8 x 4 = 32<\/p>\n<p dir=\"ltr\">c. 9 x 3 = 27<\/p>\n<p dir=\"ltr\">d. 9 x 6 = 54<\/p>\n<p dir=\"ltr\">B\u00e0i 9: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a. 18 : \u2026 = 6<\/p>\n<p dir=\"ltr\">b. \u2026 : 5 = 7<\/p>\n<p dir=\"ltr\">c. 24 : \u2026 = 4<\/p>\n<p dir=\"ltr\">d. \u2026 : 2 = 9<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 18 : 3 = 6<\/p>\n<p dir=\"ltr\">b. 35 : 5 = 7<\/p>\n<p dir=\"ltr\">c. 24 : 6 = 4<\/p>\n<p dir=\"ltr\">d. 18 : 2 = 9<\/p>\n<p dir=\"ltr\">B\u00e0i 10: T\u00ecm x, bi\u1ebft:<\/p>\n<p dir=\"ltr\">a. x x 5 = 40<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 72 : x = 8<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. x x 9 = 81<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 56 : x = 7<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. x x 5 = 40<\/p>\n<p dir=\"ltr\">x = 40 : 5<\/p>\n<p dir=\"ltr\">x = 8<\/p>\n<p dir=\"ltr\">b. 72 : x = 8<\/p>\n<p dir=\"ltr\">x = 72 : 8<\/p>\n<p dir=\"ltr\">x = 9<\/p>\n<p dir=\"ltr\">c. x x 9 = 81<\/p>\n<p dir=\"ltr\">x = 81 : 9<\/p>\n<p dir=\"ltr\">x = 9<\/p>\n<p dir=\"ltr\">d. 56 : x = 7<\/p>\n<p dir=\"ltr\">x = 56 : 7<\/p>\n<p dir=\"ltr\">x = 8<\/p>\n<p dir=\"ltr\">B\u00e0i 11: So s\u00e1nh c\u00e1c c\u1eb7p s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">a. 7 x 4 v\u00e0 28<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 36 : 6 v\u00e0 6<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 8 x 5 v\u00e0 40<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 49 : 7 v\u00e0 7<\/p>\n<p dir=\"ltr\">\u2026\u2026\u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 7 x 4 = 28 n\u00ean 28 = 28<\/p>\n<p dir=\"ltr\">b. 36 : 6 = 6 n\u00ean 6 = 6<\/p>\n<p dir=\"ltr\">c. 8 x 5 = 40 n\u00ean 40 = 40<\/p>\n<p dir=\"ltr\">d. 49 : 7 = 7 n\u00ean 7 = 7<\/p>\n<p dir=\"ltr\">B\u00e0i 12: T\u00ecm hai s\u1ed1 c\u00f3 t\u00edch b\u1eb1ng 0 v\u00e0 c\u00f3 t\u1ed5ng b\u1eb1ng 8.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n: Hai s\u1ed1 \u0111\u00f3 l\u00e0: s\u1ed1 0 v\u00e0 s\u1ed1 8.<\/p>\n<p dir=\"ltr\">B\u00e0i 13: T\u00ecm s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 sao cho s\u1ed1 h\u00e0ng ch\u1ee5c chia cho s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 b\u1eb1ng 3.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n: 93<\/p>\n<p dir=\"ltr\">C\u00e2u 14: T\u00ecm hai s\u1ed1 t\u00edch b\u1eb1ng 8 v\u00e0 c\u00f3 hi\u1ec7u b\u1eb1ng 2.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n: Hai s\u1ed1 \u0111\u00f3 l\u00e0: s\u1ed1 4 v\u00e0 s\u1ed1 2.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_tinh_nham_tinh_nhanh_lop_2_nang_cao\"><\/span>B\u00e0i t\u1eadp t\u00ednh nh\u1ea9m, t\u00ednh nhanh l\u1edbp 2 n\u00e2ng cao<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: T\u00ednh t\u1ed5ng:<\/p>\n<p dir=\"ltr\">a. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 28 + 32 + 28 + 12 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45<\/p>\n<p dir=\"ltr\">b. 28 + 32 + 28 + 12 = 100<\/p>\n<p dir=\"ltr\">B\u00e0i 2: T\u00ednh nhanh:<\/p>\n<p dir=\"ltr\">a. 10 + 20 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 20 + 20 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 30 + 30 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 30 \u2013 10 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 10 + 20 = 30<\/p>\n<p dir=\"ltr\">b. 20 + 20 = 40<\/p>\n<p dir=\"ltr\">c. 30 + 30 = 60<\/p>\n<p dir=\"ltr\">d. 30 \u2013 10 = 20<\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u00ednh nhanh:<\/p>\n<p dir=\"ltr\">a. 58 \u2013 28 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 67 \u2013 37 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 35 \u2013 15 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 58 \u2013 28 = 30<\/p>\n<p dir=\"ltr\">b. 67 \u2013 37 = 30<\/p>\n<p dir=\"ltr\">c. 35 \u2013 15 = 20<\/p>\n<p dir=\"ltr\">B\u00e0i 4: T\u00ednh:<\/p>\n<p dir=\"ltr\">a. 1 x 2 x 3 x 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 1 x 2 x 2 x 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 1 x 2 x 3 x 5 = 30<\/p>\n<p dir=\"ltr\">b. 1 x 2 x 2 x 5 = 20<\/p>\n<p dir=\"ltr\">B\u00e0i 5: T\u00ednh nhanh:<\/p>\n<p dir=\"ltr\">a. 28 + 27 + 12 + 23 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 28 \u2013 6 + 36 \u2013 8 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 25 \u2013 5 \u2013 23 + 5 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 28 + 27 + 12 + 23 = 90<\/p>\n<p dir=\"ltr\">b. 28 \u2013 6 + 36 \u2013 8 = 50<\/p>\n<p dir=\"ltr\">c. 25 \u2013 5 \u2013 23 + 5 = 2<\/p>\n<p dir=\"ltr\">B\u00e0i 6: T\u00ednh t\u1ed5ng:<\/p>\n<p dir=\"ltr\">a. 5 + 10 + 15 + 20 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 11 + 22 + 33 + 44 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 5 + 10 + 15 + 20 = 50<\/p>\n<p dir=\"ltr\">b. 11 + 22 + 33 + 44 = 110<\/p>\n<p dir=\"ltr\">B\u00e0i 7: T\u00ednh nhanh:<\/p>\n<p dir=\"ltr\">a. 40 + 50 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 70 + 80 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 90 + 90 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">d. 50 \u2013 20 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 40 + 50 = 90<\/p>\n<p dir=\"ltr\">b. 70 + 80 = 150<\/p>\n<p dir=\"ltr\">c. 90 + 90 = 180<\/p>\n<p dir=\"ltr\">d. 50 \u2013 20 = 30<\/p>\n<p dir=\"ltr\">B\u00e0i 8: T\u00ednh nhanh:<\/p>\n<p dir=\"ltr\">a. 64 \u2013 34 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 77 \u2013 47 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 56 \u2013 26 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 64 \u2013 34 = 30<\/p>\n<p dir=\"ltr\">b. 77 \u2013 47 = 30<\/p>\n<p dir=\"ltr\">c. 56 \u2013 26 = 30<\/p>\n<p dir=\"ltr\">B\u00e0i 9: T\u00ednh:<\/p>\n<p dir=\"ltr\">a. 2 x 3 x 4 x 1 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 3 x 3 x 2 x 2 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 2 x 3 x 4 x 1 = 24<\/p>\n<p dir=\"ltr\">b. 3 x 3 x 2 x 2 = 36<\/p>\n<p dir=\"ltr\">B\u00e0i 10: T\u00ednh nhanh:<\/p>\n<p dir=\"ltr\">a. 18 + 27 + 15 + 20 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">b. 24 \u2013 4 + 36 \u2013 6 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">c. 45 \u2013 5 \u2013 23 + 3 = \u2026\u2026\u2026.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 18 + 27 + 15 + 20 = 80<\/p>\n<p dir=\"ltr\">b. 24 \u2013 4 + 36 \u2013 6 = 50<\/p>\n<p dir=\"ltr\">c. 45 \u2013 5 \u2013 23 + 3 = 20<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_toan_co_loi_van_lop_2_co_dap_an\"><\/span>B\u00e0i to\u00e1n c\u00f3 l\u1eddi v\u0103n l\u1edbp 2 c\u00f3 \u0111\u00e1p \u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: Hoa c\u00f3 12 c\u00e1i k\u1eb9o. M\u1eb9 cho Hoa th\u00eam 8 c\u00e1i k\u1eb9o n\u1eefa. H\u1ecfi Hoa c\u00f3 t\u1ea5t c\u1ea3 bao nhi\u00eau c\u00e1i k\u1eb9o?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 k\u1eb9o Hoa c\u00f3 t\u1ea5t c\u1ea3 l\u00e0:<\/p>\n<p dir=\"ltr\">12 + 8 = 20 (c\u00e1i)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 20 c\u00e1i k\u1eb9o<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Nam c\u00f3 15 quy\u1ec3n s\u00e1ch, sau khi t\u1eb7ng b\u1ea1n 5 quy\u1ec3n s\u00e1ch, Nam c\u00f2n l\u1ea1i bao nhi\u00eau quy\u1ec3n s\u00e1ch?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 quy\u1ec3n s\u00e1ch Nam c\u00f2n l\u1ea1i l\u00e0:<\/p>\n<p dir=\"ltr\">15 &#8211; 5 = 10 (quy\u1ec3n)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 10 quy\u1ec3n s\u00e1ch<\/p>\n<p dir=\"ltr\">B\u00e0i 3: L\u1edbp 2A c\u00f3 18 h\u1ecdc sinh nam v\u00e0 12 h\u1ecdc sinh n\u1eef. H\u1ecfi l\u1edbp 2A c\u00f3 t\u1ea5t c\u1ea3 bao nhi\u00eau h\u1ecdc sinh?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 h\u1ecdc sinh l\u1edbp 2A c\u00f3 t\u1ea5t c\u1ea3 l\u00e0:<\/p>\n<p dir=\"ltr\">18 + 12 = 30 (h\u1ecdc sinh)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 30 h\u1ecdc sinh<\/p>\n<p dir=\"ltr\">B\u00e0i 4: Tr\u00ean c\u00e0nh c\u00e2y c\u00f3 25 con chim, c\u00f3 10 con bay \u0111i. H\u1ecfi tr\u00ean c\u00e0nh c\u00f2n l\u1ea1i bao nhi\u00eau con chim?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 con chim c\u00f2n l\u1ea1i tr\u00ean c\u00e0nh l\u00e0:<\/p>\n<p dir=\"ltr\">25 &#8211; 10 = 15 (con)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 15 con chim<\/p>\n<p dir=\"ltr\">B\u00e0i 5: Trong v\u01b0\u1eddn c\u00f3 14 c\u00e2y cam v\u00e0 6 c\u00e2y xo\u00e0i. H\u1ecfi trong v\u01b0\u1eddn c\u00f3 t\u1ea5t c\u1ea3 bao nhi\u00eau c\u00e2y?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 c\u00e2y c\u00f3 trong v\u01b0\u1eddn l\u00e0:<\/p>\n<p dir=\"ltr\">14 + 6 = 20 (c\u00e2y)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 20 c\u00e2y<\/p>\n<p dir=\"ltr\">B\u00e0i 6: M\u1ed9t c\u1eeda h\u00e0ng c\u00f3 40 c\u00e1i b\u00e1nh, \u0111\u00e3 b\u00e1n \u0111\u01b0\u1ee3c 25 c\u00e1i. H\u1ecfi c\u1eeda h\u00e0ng c\u00f2n l\u1ea1i bao nhi\u00eau c\u00e1i b\u00e1nh?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 c\u00e1i b\u00e1nh c\u1eeda h\u00e0ng c\u00f2n l\u1ea1i l\u00e0:<\/p>\n<p dir=\"ltr\">40 &#8211; 25 = 15 (c\u00e1i)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 15 c\u00e1i b\u00e1nh<\/p>\n<p dir=\"ltr\">B\u00e0i 7: Lan c\u00f3 20 b\u00f4ng hoa, Lan chia \u0111\u1ec1u cho 4 b\u1ea1n. H\u1ecfi m\u1ed7i b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c bao nhi\u00eau b\u00f4ng hoa?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 b\u00f4ng hoa m\u1ed7i b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c l\u00e0:<\/p>\n<p dir=\"ltr\">20 : 4 = 5 (b\u00f4ng)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 5 b\u00f4ng hoa<\/p>\n<p dir=\"ltr\">B\u00e0i 8: C\u00f3 10 con th\u1ecf, m\u1ed7i con th\u1ecf c\u00f3 2 tai. H\u1ecfi c\u00f3 t\u1ea5t c\u1ea3 bao nhi\u00eau tai th\u1ecf?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 tai th\u1ecf c\u00f3 t\u1ea5t c\u1ea3 l\u00e0:<\/p>\n<p dir=\"ltr\">10 x 2 = 20 (tai)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 20 tai th\u1ecf<\/p>\n<p dir=\"ltr\">B\u00e0i 9: Mai c\u00f3 8 qu\u1ea3 t\u00e1o, Lan c\u00f3 s\u1ed1 t\u00e1o g\u1ea5p \u0111\u00f4i s\u1ed1 t\u00e1o c\u1ee7a Mai. H\u1ecfi Lan c\u00f3 bao nhi\u00eau qu\u1ea3 t\u00e1o?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 t\u00e1o Lan c\u00f3 l\u00e0:<\/p>\n<p dir=\"ltr\">8 x 2 = 16 (qu\u1ea3)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 16 qu\u1ea3 t\u00e1o<\/p>\n<p dir=\"ltr\">B\u00e0i 10: M\u1ed9t nh\u00f3m h\u1ecdc sinh c\u00f3 30 h\u1ecdc sinh, \u0111\u01b0\u1ee3c chia th\u00e0nh 5 \u0111\u1ed9i. H\u1ecfi m\u1ed7i \u0111\u1ed9i c\u00f3 bao nhi\u00eau h\u1ecdc sinh?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 h\u1ecdc sinh m\u1ed7i \u0111\u1ed9i c\u00f3 l\u00e0:<\/p>\n<p dir=\"ltr\">30 : 5 = 6 (h\u1ecdc sinh)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 6 h\u1ecdc sinh<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_doc_viet_va_so_sanh_cac_so_co_3_chu_so_toan_lop_2_nang_cao\"><\/span>B\u00e0i t\u1eadp \u0111\u1ecdc, vi\u1ebft v\u00e0 so s\u00e1nh c\u00e1c s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 to\u00e1n l\u1edbp 2 n\u00e2ng cao<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: \u0110\u1ecdc c\u00e1c s\u1ed1 sau:<\/p>\n<p dir=\"ltr\">a. 231: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">b. 537: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">c. 406: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 231: Hai tr\u0103m ba m\u01b0\u01a1i m\u1ed1t<\/p>\n<p dir=\"ltr\">b. 537: N\u0103m tr\u0103m ba m\u01b0\u01a1i b\u1ea3y<\/p>\n<p dir=\"ltr\">c. 406: B\u1ed1n tr\u0103m linh s\u00e1u<\/p>\n<p dir=\"ltr\">B\u00e0i 2: S\u1ed1 762 \u0111\u01b0\u1ee3c \u0111\u1ecdc l\u00e0:<\/p>\n<p dir=\"ltr\">A. B\u1ea3y s\u00e1u hai<\/p>\n<p dir=\"ltr\">B. B\u1ea3y tr\u0103m s\u00e1u m\u01b0\u01a1i hai<\/p>\n<p dir=\"ltr\">C. B\u1ea3y tr\u0103m s\u00e1u hai<\/p>\n<p dir=\"ltr\">D. B\u1ea3y s\u00e1u m\u01b0\u01a1i hai<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">B. B\u1ea3y tr\u0103m s\u00e1u m\u01b0\u01a1i hai<\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u00ecm s\u1ed1 th\u00edch h\u1ee3p \u0111i\u1ec1n v\u00e0o ch\u1ed7 ch\u1ea5m: \u201cS\u00e1u tr\u0103m m\u01b0\u1eddi l\u0103m\u201d \u0111\u01b0\u1ee3c vi\u1ebft l\u00e0\u2026?<\/p>\n<p dir=\"ltr\">A. 615<\/p>\n<p dir=\"ltr\">B. 650<\/p>\n<p dir=\"ltr\">C. 605<\/p>\n<p dir=\"ltr\">D. 651<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">A. 615<\/p>\n<p dir=\"ltr\">B\u00e0i 4: Cho c\u00e1c s\u1ed1: 325, 452, 569, 582, 352, 520, 493. S\u1ed1 l\u1edbn nh\u1ea5t trong c\u00e1c s\u1ed1 k\u1ec3 tr\u00ean l\u00e0:<\/p>\n<p dir=\"ltr\">A. 569<\/p>\n<p dir=\"ltr\">B. 493<\/p>\n<p dir=\"ltr\">C. 582<\/p>\n<p dir=\"ltr\">D. 520<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">C. 582<\/p>\n<p dir=\"ltr\">B\u00e0i 5: T\u00ecm s\u1ed1 tr\u00f2n ch\u1ee5c X th\u1ecfa m\u00e3n 235 &lt; X &lt; 245:<\/p>\n<p dir=\"ltr\">A. 240<\/p>\n<p dir=\"ltr\">B. 230<\/p>\n<p dir=\"ltr\">C. 250<\/p>\n<p dir=\"ltr\">D. 220<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">A. 240<\/p>\n<p dir=\"ltr\">B\u00e0i 6: Vi\u1ebft c\u00e1c s\u1ed1 l\u1edbn h\u01a1n 614 m\u00e0 nh\u1ecf h\u01a1n 623<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">615, 616, 617, 618, 619, 620, 621, 622<\/p>\n<p dir=\"ltr\">B\u00e0i 7: \u0110i\u1ec1n d\u1ea5u th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a. 437 \u2026\u2026 473<\/p>\n<p dir=\"ltr\">b. 233 \u2026\u2026 232<\/p>\n<p dir=\"ltr\">c. 602 \u2026\u2026 701<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 437 &lt; 473<\/p>\n<p dir=\"ltr\">b. 233 &gt; 232<\/p>\n<p dir=\"ltr\">c. 602 &lt; 701<\/p>\n<p dir=\"ltr\">B\u00e0i 8: T\u00ecm s\u1ed1 l\u1edbn nh\u1ea5t v\u00e0 s\u1ed1 b\u00e9 nh\u1ea5t trong c\u00e1c s\u1ed1 sau: 221, 203, 231, 209, 252, 260, 258, 285<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 l\u1edbn nh\u1ea5t: 285<\/p>\n<p dir=\"ltr\">S\u1ed1 b\u00e9 nh\u1ea5t: 203<\/p>\n<p dir=\"ltr\">B\u00e0i 9: S\u1eafp x\u1ebfp c\u00e1c s\u1ed1:<\/p>\n<p dir=\"ltr\">a. 301, 333, 321, 345, 306, 389, 365 theo th\u1ee9 t\u1ef1 t\u1eeb b\u00e9 \u0111\u1ebfn l\u1edbn<\/p>\n<p dir=\"ltr\">b. 598, 582, 505, 555, 562, 548, 574 theo th\u1ee9 t\u1ef1 t\u1eeb l\u1edbn \u0111\u1ebfn b\u00e9<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 301, 306, 321, 333, 345, 365, 389<\/p>\n<p dir=\"ltr\">b. 598, 582, 574, 562, 555, 548, 505<\/p>\n<p dir=\"ltr\">B\u00e0i 10: T\u00ecm s\u1ed1 tr\u00f2n tr\u0103m X th\u1ecfa m\u00e3n 300 &lt; X &lt; 600:<\/p>\n<p dir=\"ltr\">A. 400<\/p>\n<p dir=\"ltr\">B. 300<\/p>\n<p dir=\"ltr\">C. 600<\/p>\n<p dir=\"ltr\">D. 700<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">A. 400<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Huong_dan_giai_bai_toan_don_vi_do_do_dai_lop_2_nang_cao\"><\/span>H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i to\u00e1n \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 d\u00e0i l\u1edbp 2 n\u00e2ng cao<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m: \u201c\u2026\u2026cm = 10mm\u201d<\/p>\n<p dir=\"ltr\">A. 1<\/p>\n<p dir=\"ltr\">B. 10<\/p>\n<p dir=\"ltr\">C. 100<\/p>\n<p dir=\"ltr\">D. 1000<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">A. 1<\/p>\n<p dir=\"ltr\">B\u00e0i 2: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m: \u201c54m \u2013 46m = \u2026\u2026m\u201d l\u00e0:<\/p>\n<p dir=\"ltr\">A. 10m<\/p>\n<p dir=\"ltr\">B. 20m<\/p>\n<p dir=\"ltr\">C. 8m<\/p>\n<p dir=\"ltr\">D. 12m<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">C. 8m<\/p>\n<p dir=\"ltr\">B\u00e0i 3: C\u00e2y th\u1ee9 nh\u1ea5t cao 9m, c\u00e2y th\u1ee9 hai th\u1ea5p h\u01a1n c\u00e2y th\u1ee9 nh\u1ea5t 3m. H\u1ecfi c\u00e2y th\u1ee9 hai c\u00f3 chi\u1ec1u cao l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">A. 12m<\/p>\n<p dir=\"ltr\">B. 10m<\/p>\n<p dir=\"ltr\">C. 6m<\/p>\n<p dir=\"ltr\">D. 8m<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">C. 6m<\/p>\n<p dir=\"ltr\">B\u00e0i 4: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a. 1dm = \u2026\u2026cm<\/p>\n<p dir=\"ltr\">b. 1m = \u2026\u2026cm<\/p>\n<p dir=\"ltr\">c. 10dm = \u2026\u2026m<\/p>\n<p dir=\"ltr\">d. 300cm = \u2026\u2026m<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. 1dm = 10cm<\/p>\n<p dir=\"ltr\">b. 1m = 100cm<\/p>\n<p dir=\"ltr\">c. 10dm = 1m<\/p>\n<p dir=\"ltr\">d. 300cm = 3m<\/p>\n<p dir=\"ltr\">B\u00e0i 5: \u0110i\u1ec1n c\u00e1c \u0111\u01a1n v\u1ecb \u0111o (cm, dm, m) th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a. T\u00f2a nh\u00e0 cao 50\u2026\u2026<\/p>\n<p dir=\"ltr\">b. H\u01b0ng cao 170\u2026\u2026<\/p>\n<p dir=\"ltr\">c. Th\u01b0\u1edbc k\u1ebb d\u00e0i 2\u2026\u2026<\/p>\n<p dir=\"ltr\">d. C\u00e2y cau cao 3\u2026\u2026<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">a. T\u00f2a nh\u00e0 cao 50m<\/p>\n<p dir=\"ltr\">b. H\u01b0ng cao 170cm<\/p>\n<p dir=\"ltr\">c. Th\u01b0\u1edbc k\u1ebb d\u00e0i 2dm<\/p>\n<p dir=\"ltr\">d. C\u00e2y cau cao 3m<\/p>\n<p dir=\"ltr\">B\u00e0i 6: \u0110\u1ed9i A s\u1eeda \u0111\u01b0\u1ee3c 72m \u0111\u01b0\u1eddng. \u0110\u1ed9i B s\u1eeda \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01a1n \u0111\u1ed9i A 15m \u0111\u01b0\u1eddng. H\u1ecfi \u0111\u1ed9i B s\u1eeda \u0111\u01b0\u1ee3c bao nhi\u00eau m\u00e9t \u0111\u01b0\u1eddng?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 m\u00e9t \u0111\u01b0\u1eddng \u0111\u1ed9i B s\u1eeda \u0111\u01b0\u1ee3c l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">72 + 15 = 87 (m)\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 87m<\/p>\n<p dir=\"ltr\">B\u00e0i 7: M\u1ed9t s\u1ee3i d\u00e2y d\u00e0i 1m, ng\u01b0\u1eddi ta c\u1eaft \u0111i 25cm. H\u1ecfi s\u1ee3i d\u00e2y c\u00f2n l\u1ea1i bao nhi\u00eau cm?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">Chi\u1ec1u d\u00e0i s\u1ee3i d\u00e2y c\u00f2n l\u1ea1i l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">100 &#8211; 25 = 75 (cm)\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 75cm<\/p>\n<p dir=\"ltr\">B\u00e0i 8: M\u1ed9t c\u00e2y th\u01b0\u1edbc d\u00e0i 2dm, m\u1ed9t c\u00e2y th\u01b0\u1edbc kh\u00e1c d\u00e0i h\u01a1n c\u00e2y th\u01b0\u1edbc n\u00e0y 3cm. H\u1ecfi c\u00e2y th\u01b0\u1edbc kia d\u00e0i bao nhi\u00eau cm?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">Chi\u1ec1u d\u00e0i c\u00e2y th\u01b0\u1edbc kia l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">20 + 3 = 23 (cm)\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 23cm<\/p>\n<p dir=\"ltr\">B\u00e0i 9: M\u1ed9t cu\u1ed9n d\u00e2y d\u00e0i 5m, ng\u01b0\u1eddi ta c\u1eaft th\u00e0nh c\u00e1c \u0111o\u1ea1n, m\u1ed7i \u0111o\u1ea1n d\u00e0i 50cm. H\u1ecfi c\u00f3 th\u1ec3 c\u1eaft \u0111\u01b0\u1ee3c bao nhi\u00eau \u0111o\u1ea1n d\u00e2y?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">S\u1ed1 \u0111o\u1ea1n d\u00e2y c\u00f3 th\u1ec3 c\u1eaft \u0111\u01b0\u1ee3c l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">500 : 50 = 10 (\u0111o\u1ea1n)\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 10 \u0111o\u1ea1n d\u00e2y<\/p>\n<p dir=\"ltr\">B\u00e0i 10: M\u1ed9t c\u00e1i s\u00e2n c\u00f3 chi\u1ec1u d\u00e0i 30m, chi\u1ec1u r\u1ed9ng b\u1eb1ng 1\/3 chi\u1ec1u d\u00e0i. H\u1ecfi chi\u1ec1u r\u1ed9ng c\u1ee7a c\u00e1i s\u00e2n l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:<\/p>\n<p dir=\"ltr\">Chi\u1ec1u r\u1ed9ng c\u1ee7a c\u00e1i s\u00e2n l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">30 : 3 = 10 (m)\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 10m<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_toan_do_lop_2_luyen_tu_duy\"><\/span>B\u00e0i to\u00e1n \u0111\u1ed1 l\u1edbp 2 luy\u1ec7n t\u01b0 duy<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: B\u1ea1n Ng\u1ecdc \u0111\u00e3 d\u00f9ng h\u1ebft 35 ch\u1eef s\u1ed1 \u0111\u1ec3 vi\u1ebft c\u00e1c s\u1ed1 li\u1ec1n nhau th\u00e0nh m\u1ed9t d\u00e3y s\u1ed1 li\u00ean ti\u1ebfp: 1, 2, 3, 4, \u2026 X. H\u1ecfi X l\u00e0 s\u1ed1 n\u00e0o? (X l\u00e0 s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a d\u00e3y s\u1ed1).<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:\u00a0<\/p>\n<p dir=\"ltr\">S\u1ed1 1 \u0111\u1ebfn 9 c\u00f3 9 s\u1ed1, m\u1ed7i s\u1ed1 c\u00f3 1 ch\u1eef s\u1ed1 =&gt; 9 ch\u1eef s\u1ed1.\u00a0<\/p>\n<p dir=\"ltr\">S\u1ed1 10 \u0111\u1ebfn 19 c\u00f3 10 s\u1ed1, m\u1ed7i s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1 =&gt; 20 ch\u1eef s\u1ed1.\u00a0<\/p>\n<p dir=\"ltr\">T\u1ed5ng s\u1ed1 ch\u1eef s\u1ed1 \u0111\u00e3 d\u00f9ng l\u00e0: 9 + 20 = 29 ch\u1eef s\u1ed1.\u00a0<\/p>\n<p dir=\"ltr\">S\u1ed1 20 \u0111\u1ebfn 22 c\u00f3 3 s\u1ed1, m\u1ed7i s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1 =&gt; 6 ch\u1eef s\u1ed1.\u00a0<\/p>\n<p dir=\"ltr\">T\u1ed5ng s\u1ed1 ch\u1eef s\u1ed1 \u0111\u00e3 d\u00f9ng l\u00e0: 29 + 6 = 35 ch\u1eef s\u1ed1.\u00a0<\/p>\n<p dir=\"ltr\">V\u1eady X l\u00e0 s\u1ed1 22. \u0110\u00e1p s\u1ed1: 22<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Trong gia \u0111\u00ecnh c\u1ea7n c\u00f3 \u00edt nh\u1ea5t bao nhi\u00eau \u0111\u1ee9a tr\u1ebb \u0111\u1ec3 m\u1ed7i \u0111\u1ee9a tr\u1ebb \u0111\u1ec1u c\u00f3 \u00edt nh\u1ea5t 1 anh ho\u1eb7c em trai v\u00e0 c\u00f3 \u00edt nh\u1ea5t 1 ch\u1ecb ho\u1eb7c em g\u00e1i?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:\u00a0<\/p>\n<p dir=\"ltr\">Gia \u0111\u00ecnh c\u1ea7n c\u00f3 \u00edt nh\u1ea5t 4 \u0111\u1ee9a tr\u1ebb:\u00a0<\/p>\n<p dir=\"ltr\">2 trai v\u00e0 2 g\u00e1i.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 4 \u0111\u1ee9a tr\u1ebb<\/p>\n<p dir=\"ltr\">B\u00e0i 3: Em h\u00e3y t\u00ecm s\u1ed1 ti\u1ebfp theo:<\/p>\n<p dir=\"ltr\">a. 1, 3, 5, 7, 9,\u2026\u2026<\/p>\n<p dir=\"ltr\">Gi\u1ea3i th\u00edch: D\u00e3y s\u1ed1 l\u00e0 d\u00e3y s\u1ed1 l\u1ebb, m\u1ed7i s\u1ed1 h\u01a1n s\u1ed1 tr\u01b0\u1edbc n\u00f3 2 \u0111\u01a1n v\u1ecb. S\u1ed1 ti\u1ebfp theo l\u00e0: 11 \u0110\u00e1p s\u1ed1: 11<\/p>\n<p dir=\"ltr\">b. 1, 4, 7, 10, 13,\u2026\u2026<\/p>\n<p dir=\"ltr\">Gi\u1ea3i th\u00edch: M\u1ed7i s\u1ed1 h\u01a1n s\u1ed1 tr\u01b0\u1edbc n\u00f3 3 \u0111\u01a1n v\u1ecb. S\u1ed1 ti\u1ebfp theo l\u00e0: 16 \u0110\u00e1p s\u1ed1: 16<\/p>\n<p dir=\"ltr\">B\u00e0i 4: Ch\u1ec9 s\u1eed d\u1ee5ng c\u00e1c ch\u1eef s\u1ed1 1 v\u00e0 ch\u1eef s\u1ed1 2, c\u00f3 th\u1ec3 vi\u1ebft \u0111\u01b0\u1ee3c bao nhi\u00eau s\u1ed1 c\u00f3 1 ho\u1eb7c 2 ch\u1eef s\u1ed1?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:\u00a0<\/p>\n<p dir=\"ltr\">S\u1ed1 c\u00f3 1 ch\u1eef s\u1ed1: 1, 2 S\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1: 11, 12, 21, 22 V\u1eady c\u00f3 6 s\u1ed1.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 6 s\u1ed1<\/p>\n<p dir=\"ltr\">B\u00e0i 5: Vi\u1ebft s\u1ed1 t\u1ef1 nhi\u00ean nh\u1ecf nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 v\u00e0 t\u1ed5ng c\u00e1c ch\u1eef s\u1ed1 b\u1eb1ng 20.<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n: S\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 v\u00e0 t\u1ed5ng c\u00e1c ch\u1eef s\u1ed1 b\u1eb1ng 20 l\u00e0 299. \u0110\u00e1p s\u1ed1: 299<\/p>\n<p dir=\"ltr\">B\u00e0i 6: N\u1ebfu m\u1ed9t tu\u1ea7n c\u00f3 5 ng\u00e0y v\u00e0 m\u1ed9t ng\u00e0y c\u00f3 5 gi\u1edd, th\u00ec m\u1ed9t tu\u1ea7n c\u00f3 bao nhi\u00eau gi\u1edd?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n: M\u1ed9t tu\u1ea7n c\u00f3 s\u1ed1 gi\u1edd l\u00e0: 5 ng\u00e0y x 5 gi\u1edd = 25 gi\u1edd. \u0110\u00e1p s\u1ed1: 25 gi\u1edd<\/p>\n<p dir=\"ltr\">B\u00e0i 7: M\u1ed9t \u0111o\u00e0n t\u00e0u c\u00f3 10 toa, m\u1ed7i toa c\u00f3 2 b\u00e1nh xe. H\u1ecfi c\u1ea3 \u0111o\u00e0n t\u00e0u c\u00f3 bao nhi\u00eau b\u00e1nh xe?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:\u00a0<\/p>\n<p dir=\"ltr\">C\u1ea3 \u0111o\u00e0n t\u00e0u c\u00f3 s\u1ed1 b\u00e1nh xe l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">10 toa x 2 b\u00e1nh\/toa = 20 b\u00e1nh xe.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 20 b\u00e1nh xe<\/p>\n<p dir=\"ltr\">B\u00e0i 8: Trong m\u1ed9t h\u1ed9p c\u00f3 12 vi\u00ean k\u1eb9o, H\u00f9ng \u0103n 3 vi\u00ean, sau \u0111\u00f3 H\u00f9ng \u0103n th\u00eam 4 vi\u00ean n\u1eefa. H\u1ecfi H\u00f9ng \u0111\u00e3 \u0103n bao nhi\u00eau vi\u00ean k\u1eb9o?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:\u00a0<\/p>\n<p dir=\"ltr\">S\u1ed1 k\u1eb9o H\u00f9ng \u0111\u00e3 \u0103n l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">3 + 4 = 7 vi\u00ean.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 7 vi\u00ean k\u1eb9o<\/p>\n<p dir=\"ltr\">B\u00e0i 9: M\u1ed9t chi\u1ebfc b\u00fat ch\u00ec d\u00e0i 15 cm, m\u1ed9t chi\u1ebfc b\u00fat bi d\u00e0i 12 cm. H\u1ecfi chi\u1ebfc b\u00fat ch\u00ec d\u00e0i h\u01a1n chi\u1ebfc b\u00fat bi bao nhi\u00eau cm?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n:\u00a0<\/p>\n<p dir=\"ltr\">Chi\u1ebfc b\u00fat ch\u00ec d\u00e0i h\u01a1n chi\u1ebfc b\u00fat bi l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">15 &#8211; 12 = 3 cm.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 3 cm<\/p>\n<p dir=\"ltr\">B\u00e0i 10: C\u00f3 5 qu\u1ea3 t\u00e1o v\u00e0 3 qu\u1ea3 cam trong m\u1ed9t gi\u1ecf. H\u1ecfi trong gi\u1ecf c\u00f3 bao nhi\u00eau qu\u1ea3 tr\u00e1i c\u00e2y?<\/p>\n<p dir=\"ltr\">\u0110\u00e1p \u00e1n: S\u1ed1 qu\u1ea3 tr\u00e1i c\u00e2y trong gi\u1ecf l\u00e0:\u00a0<\/p>\n<p dir=\"ltr\">5 + 3 = 8 qu\u1ea3.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 8 qu\u1ea3 tr\u00e1i c\u00e2y<\/p>\n<p dir=\"ltr\">Xem th\u00eam:<\/p>\n<ul>\n<li dir=\"ltr\">T\u1ed5ng h\u1ee3p c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp to\u00e1n l\u1edbp 5 H\u1ed6N S\u1ed0 th\u01b0\u1eddng g\u1eb7p<\/li>\n<li dir=\"ltr\">C\u00e1c s\u1ed1 la m\u00e3 k\u00fd hi\u1ec7u nh\u01b0 th\u1ebf n\u00e0o? C\u00e1ch \u0111\u1ecdc v\u00e0 c\u00e1ch vi\u1ebft ra sao?<\/li>\n<li dir=\"ltr\">100+ b\u00e0i t\u1eadp to\u00e1n cho b\u00e9 5 tu\u1ed5i r\u00e8n luy\u1ec7n t\u01b0 duy hi\u1ec7u qu\u1ea3<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_giup_be_lam_bai_tap_toan_nang_cao_lop_2_hieu_qua\"><\/span>B\u00ed quy\u1ebft gi\u00fap b\u00e9 l\u00e0m b\u00e0i t\u1eadp to\u00e1n n\u00e2ng cao l\u1edbp 2 hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Mu\u1ed1n c\u00e1c con h\u1ecdc v\u00e0 gi\u1ea3i \u0111\u01b0\u1ee3c b\u00e0i t\u1eadp to\u00e1n n\u00e2ng cao l\u1edbp 2 hi\u1ec7u qu\u1ea3 th\u00ec ba m\u1eb9 nh\u1ea5t \u0111\u1ecbnh ph\u1ea3i c\u00f3 m\u1ed9t s\u1ed1 b\u00ed quy\u1ebft. Sau \u0111\u00e2y s\u1ebd l\u00e0 nh\u1eefng b\u00ed quy\u1ebft gi\u1ea3i \u0111\u1ec1 to\u00e1n n\u00e2ng cao l\u1edbp 2 m\u00e0 b\u1ed1 m\u1eb9 n\u00ean trang b\u1ecb cho c\u00e1c con:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tao_nen_tang_hoc_toan_lop_2_nang_cao_cung_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\"><\/span>T\u1ea1o n\u1ec1n t\u1ea3ng h\u1ecdc to\u00e1n l\u1edbp 2 n\u00e2ng cao c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Cho b\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 n\u00e2ng cao v\u1edbi\u00a0Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math th\u1ef1c s\u1ef1 l\u00e0 m\u1ed9t c\u00e1ch h\u1ecdc r\u1ea5t th\u00fa v\u1ecb v\u00e0 \u0111em l\u1ea1i hi\u1ec7u qu\u1ea3 cao. Nhi\u1ec1u b\u1eadc ph\u1ee5 huynh hi\u1ec7n nay ngh\u0129 r\u1eb1ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math ch\u1ec9 gi\u1ea3ng d\u1ea1y ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n cho c\u00e1c b\u1ea1n h\u1ecdc sinh t\u1eeb l\u1edbp m\u1ea7m \u0111\u1ebfn ti\u1ec3u h\u1ecdc. Tuy nhi\u00ean, trong ch\u01b0\u01a1ng tr\u00ecnh d\u1ea1y, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math v\u1eabn thi\u1ebft k\u1ebf r\u1ea5t nhi\u1ec1u b\u00e0i t\u1eadp d\u00e0nh ri\u00eang cho c\u00e1c b\u1ea1n h\u1ecdc sinh mu\u1ed1n h\u1ecdc ki\u1ebfn th\u1ee9c n\u00e2ng cao. M\u1ed7i ki\u1ebfn th\u1ee9c \u0111\u1ec1u chia th\u00e0nh 4 c\u1ea5p \u0111\u1ed9 t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao, v\u00ec th\u1ebf c\u00e1c b\u1eadc ph\u1ee5 huynh ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 ch\u1ee7 \u0111\u1ed9ng ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc cho c\u00e1c b\u00e9.<\/p>\n<p dir=\"ltr\">M\u1eb7c d\u00f9 l\u00e0 h\u1ecdc ki\u1ebfn th\u1ee9c n\u00e2ng cao c\u1ee7a To\u00e1n l\u1edbp 2 nh\u01b0ng c\u00e1c con khi h\u1ecdc v\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math s\u1ebd th\u1ea5y r\u1ea5t th\u00fa v\u1ecb v\u00e0 th\u1eddi gian tr\u00f4i qua r\u1ea5t nhanh. \u0110\u00e3 c\u00f3 kh\u00f4ng \u00edt b\u1ea1n nh\u1ecf sau khi h\u1ecdc to\u00e1n qua Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef th\u00ec lu\u00f4n th\u1ea5y to\u00e1n h\u1ecdc th\u00fa v\u1ecb v\u00e0 y\u00eau th\u00edch to\u00e1n nhi\u1ec1u h\u01a1n.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/47-toan-lop-2-nang-cao-co-loi-giai.jpg\" alt=\"Cho b\u00e9 h\u1ecdc to\u00e1n c\u00f9ng Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef Math (Ngu\u1ed3n \u1ea3nh:Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">V\u00e0 \u0111\u1ec3 ki\u1ec3m tra vi\u1ec7c c\u00e1c b\u1ea1n nh\u1ecf ti\u1ebfp thu \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c nh\u01b0 th\u1ebf n\u00e0o th\u00ec Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math c\u00f3 thi\u1ebft k\u1ebf th\u00eam s\u00e1ch b\u00e0i t\u1eadp b\u1ed5 tr\u1ee3\u00a0\u0111i k\u00e8m. B\u1ed1 m\u1eb9 n\u00ean cho b\u00e9 l\u00e0m nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp n\u00e0y r\u1ed3i xem l\u1eddi gi\u1ea3i c\u1ee7a con \u0111\u00e3 \u0111\u00fang hay ch\u01b0a.<\/p>\n<p dir=\"ltr\">Ngo\u00e0i ra, \u0111i\u1ec3m c\u1ed9ng c\u1ee7a Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math kh\u00e1c v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng d\u1ea1y to\u00e1n kh\u00e1c ch\u00ednh l\u00e0 b\u00e9 s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc ho\u00e0n to\u00e0n b\u1eb1ng ti\u1ebfng Anh. Ngay c\u1ea3 nh\u1eefng b\u00e9 ch\u01b0a bi\u1ebft ti\u1ebfng Anh v\u1eabn c\u00f3 th\u1ec3 h\u1ecdc \u0111\u01b0\u1ee3c \u0111\u1ec3 h\u1ed7 tr\u1ee3 vi\u1ec7c h\u1ecdc ngo\u1ea1i ng\u1eef c\u1ee7a tr\u1ebb t\u1ef1 nhi\u00ean h\u01a1n, ti\u1ebft ki\u1ec7m chi ph\u00ed h\u01a1n. T\u1eeb \u0111\u00f3 gi\u00fap b\u00e9 ph\u00e1t tri\u1ec3n \u0111\u1ed3ng b\u1ed9 t\u01b0 duy &amp; ng\u00f4n ng\u1eef gi\u00fap con h\u1ecdc gi\u1ecfi c\u1ea3 to\u00e1n v\u00e0 ti\u1ebfng Anh.<\/p>\n<p dir=\"ltr\">V\u1eady n\u00ean, b\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 t\u1ea3i \u1ee9ng d\u1ee5ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math mi\u1ec5n ph\u00ed \u0111\u1ec3 c\u00f9ng con th\u1eed tr\u1ea3i nghi\u1ec7m \u0111\u1ec3 h\u1ed7 tr\u1ee3 vi\u1ec7c h\u1ecdc to\u00e1n c\u1ee7a tr\u1ebb \u0111\u1ea1t th\u00e0nh t\u00edch t\u1ed1t h\u01a1n nh\u00e9.<\/p>\n<p dir=\"ltr\">T\u1ea3i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cho \u0111i\u1ec7n tho\u1ea1i Android<\/p>\n<p dir=\"ltr\">T\u1ea3i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cho \u0111i\u1ec7n tho\u1ea1i iOS<\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><iframe loading=\"lazy\" title=\"Gi\u1edbi thi\u1ec7u \u1ee9ng d\u1ee5ng Monkey Math\" width=\"1020\" height=\"574\" src=\"https:\/\/www.youtube.com\/embed\/7DsjpvHFrOs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<table style=\"border-collapse: collapse;margin-left: auto;margin-right: auto;width: 100%;background-color: #fbeeb8;height: 92.1562px\" border=\"1\">\n<tr style=\"height: 92.1562px\">\n<td style=\"width: 98.5932%;background-color: #fbeeb8;text-align: center;height: 92.1562px\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math &#8211; \u1ee8ng D\u1ee5ng H\u1ecdc To\u00e1n S\u1ed1 1 Cho Tr\u1ebb M\u1ea7m Non &amp; Ti\u1ec3u H\u1ecdc.  <img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia.monkeyuni.net\/upload\/web\/img\/button_dang-ky-ngay-1.png\" width=\"185\"><\/td>\n<\/tr>\n<\/table>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cho_cac_con_lam_bai_tap_thuong_xuyen_moi_ngay\"><\/span>Cho c\u00e1c con l\u00e0m b\u00e0i t\u1eadp th\u01b0\u1eddng xuy\u00ean m\u1ed7i ng\u00e0y<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap con h\u1ecdc to\u00e1n n\u00e2ng cao hi\u1ec7u qu\u1ea3 n\u1eefa ch\u00ednh l\u00e0 c\u00e1c b\u1eadc ph\u1ee5 huynh h\u00e3y cho con \u00f4n luy\u1ec7n\u00a0200 b\u00e0i to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 l\u1eddi gi\u1ea3i\u00a0th\u01b0\u1eddng xuy\u00ean m\u1ed7i ng\u00e0y. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u00e9 s\u1ebd d\u1ec5 d\u00e0ng ghi nh\u1edb nh\u1eefng ch\u01b0\u01a1ng tr\u00ecnh ki\u1ebfn th\u1ee9c To\u00e1n l\u1edbp 2 m\u00e0 m\u00ecnh ph\u1ea3i h\u1ecdc, \u0111\u1ed3ng th\u1eddi n\u1eafm b\u1eaft th\u00eam \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e1ch gi\u1ea3i nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp kh\u00e1c nhau.<\/p>\n<p dir=\"ltr\">B\u00ean c\u1ea1nh \u0111\u00f3 vi\u1ec7c cho c\u00e1c con l\u00e0m b\u00e0i t\u1eadp th\u01b0\u1eddng xuy\u00ean c\u00f2n gi\u00fap cho b\u00e9 h\u00ecnh th\u00e0nh \u0111\u01b0\u1ee3c th\u00f3i quen t\u1ef1 h\u1ecdc. \u0110i\u1ec1u n\u00e0y th\u1ef1c s\u1ef1 r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi nh\u1eefng b\u1ea1n nh\u1ecf mu\u1ed1n chinh ph\u1ee5c ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n n\u00e2ng cao l\u1edbp 2.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cho_con_tham_gia_vao_cac_cuoc_thi\"><\/span>Cho con tham gia v\u00e0o c\u00e1c cu\u1ed9c thi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong c\u00e1c cu\u1ed9c thi lu\u00f4n c\u00f3 nh\u1eefng b\u00e0i to\u00e1n n\u00e2ng cao \u0111\u01b0\u1ee3c \u0111\u01b0a ra. V\u00ec th\u1ebf c\u00e1c b\u1eadc ph\u1ee5 huynh cho con tham gia v\u00e0o c\u00e1c cu\u1ed9c thi nh\u01b0 Violympic to\u00e1n l\u1edbp 2, thi h\u1ecdc sinh gi\u1ecfi tr\u01b0\u1eddng,&#8230;s\u1ebd r\u1ea5t hi\u1ec7u qu\u1ea3 trong vi\u1ec7c gi\u00fap cho b\u00e9 c\u00f3 th\u1ec3 chinh ph\u1ee5c ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n l\u1edbp 2 n\u00e2ng cao c\u00f3 l\u1eddi gi\u1ea3i d\u1ec5 d\u00e0ng h\u01a1n. B\u1edfi qua m\u1ed7i cu\u1ed9c thi th\u00ec c\u00e1c b\u1ea1n nh\u1ecf s\u1ebd t\u00edch l\u0169y th\u00eam \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c. Ngo\u00e0i ra th\u00ec cho con ti\u1ebfp c\u1eadn v\u1edbi c\u00e1c cu\u1ed9c thi c\u0169ng gi\u00fap cho b\u00e9 t\u1ef1 tin v\u00e0 m\u1ea1nh d\u1ea1n h\u01a1n. Con khi g\u1eb7p nh\u1eefng b\u00e0i to\u00e1n kh\u00f3 c\u0169ng s\u1ebd kh\u00f4ng c\u1ea3m th\u1ea5y n\u1ea3n ch\u00ed hay t\u1ef1 ti.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cho_con_on_tap_theo_cac_giai_doan\"><\/span>Cho con \u00f4n t\u1eadp theo c\u00e1c giai \u0111o\u1ea1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Vi\u1ec7c chia giai \u0111o\u1ea1n \u0111\u1ec3 cho b\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 n\u00e2ng cao l\u00e0 \u0111i\u1ec1u th\u1ef1c s\u1ef1 r\u1ea5t quan tr\u1ecdng. B\u1edfi khi b\u00e9 h\u1ecdc theo giai \u0111o\u1ea1n th\u00ec c\u00e1c b\u1ea1n nh\u1ecf s\u1ebd kh\u00f4ng c\u1ea3m th\u1ea5y s\u1ee3 h\u1ecdc. \u0110\u1ed3ng th\u1eddi v\u1edbi m\u1ed7i giai \u0111o\u1ea1n th\u00ec b\u1ed1 m\u1eb9 v\u00e0 c\u00e1c con s\u1ebd \u0111\u1eb7t ra nh\u1eefng m\u1ee5c ti\u00eau c\u1ee5 th\u1ec3 \u0111\u1ec3 gi\u00fap c\u00e1c b\u00e9 t\u1eebng b\u01b0\u1edbc ho\u00e0n th\u00e0nh m\u1ee5c ti\u00eau d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n<p dir=\"ltr\">C\u00e1c b\u1eadc ph\u1ee5 huynh tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng n\u00ean d\u1ea1y ki\u1ebfn th\u1ee9c d\u00e0n tr\u1ea3i hay k\u00e9o d\u00e0i khi\u1ebfn cho c\u00e1c b\u1ea1n nh\u1ecf c\u1ea3m th\u1ea5y ch\u00e1n n\u1ea3n khi h\u1ecdc. C\u00e1ch t\u1ed1t nh\u1ea5t l\u00e0 b\u1ed1 m\u1eb9 n\u00ean tham kh\u1ea3o ch\u01b0\u01a1ng tr\u00ecnh ki\u1ebfn th\u1ee9c \u0111\u01b0\u1ee3c chia theo t\u1eebng giai \u0111o\u1ea1n c\u1ee7a s\u00e1ch n\u00e2ng cao \u0111\u1ec3 gi\u00fap c\u00e1c b\u1ea1n nh\u1ecf h\u1ecdc to\u00e1n hi\u1ec7u qu\u1ea3.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/46-toan-lop-2-nang-cao-co-loi-giai.jpg\" alt=\"Ph\u1ee5 huynh l\u00ean cho con \u00f4n t\u1eadp to\u00e1n theo c\u00e1c giai \u0111o\u1ea1n c\u1ee5 th\u1ec3 (Ngu\u1ed3n \u1ea3nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cho_cac_ban_nho_luyen_them_nhieu_de_toan_nang_cao_lop_2\"><\/span>Cho c\u00e1c b\u1ea1n nh\u1ecf luy\u1ec7n th\u00eam nhi\u1ec1u \u0111\u1ec1 to\u00e1n n\u00e2ng cao l\u1edbp 2<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong c\u00e1c \u0111\u1ec1 thi to\u00e1n l\u1edbp 2 \u1edf b\u1ea5t c\u1ee9 cu\u1ed9c thi n\u00e0o c\u0169ng \u0111\u1ec1u s\u1ebd c\u00f3 nh\u1eefng b\u00e0i t\u1eadp n\u00e2ng cao \u0111\u01b0\u1ee3c \u0111\u01b0a ra.\u00a0 V\u00ec th\u1ebf mu\u1ed1n cho c\u00e1c b\u1ea1n nh\u1ecf h\u1ecdc t\u1ed1t To\u00e1n l\u1edbp 2 n\u00e2ng cao c\u00f3 l\u1eddi gi\u1ea3i th\u00ec c\u00e1c b\u1eadc ph\u1ee5 huynh c\u1ea7n ph\u1ea3i cho con luy\u1ec7n th\u00eam c\u00e1c \u0111\u1ec1 thi.\u00a0<\/p>\n<p dir=\"ltr\">\u0110\u1ed3ng th\u1eddi vi\u1ec7c cho c\u00e1c b\u1ea1n nh\u1ecf luy\u1ec7n c\u00e1c b\u00e0i to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 l\u1eddi gi\u1ea3i c\u00f2n gi\u00fap cho c\u00e1c b\u00e9 luy\u1ec7n t\u1eadp \u0111\u01b0\u1ee3c ph\u1ea3n x\u1ea1 l\u00e0m b\u00e0i t\u1eadp. Do \u0111\u00f3 c\u00e1c con c\u0169ng c\u00f3 th\u1ec3 ph\u00e2n chia th\u1eddi gian h\u1ee3p l\u00fd khi l\u00e0m c\u00e1c b\u00e0i ki\u1ec3m tra. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap cho c\u00e1c b\u1ea1n nh\u1ecf kh\u00f4ng h\u1ec1 c\u1ea3m th\u1ea5y b\u1ee1 ng\u1ee1 n\u1ebfu nh\u01b0 trong \u0111\u1ec1 thi c\u00f3 th\u1ec3 g\u1eb7p ph\u1ea3i nh\u1eefng b\u00e0i to\u00e1n n\u00e2ng cao l\u1edbp 2.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Khong_nen_tao_cho_be_su_ap_luc\"><\/span>Kh\u00f4ng n\u00ean t\u1ea1o cho b\u00e9 s\u1ef1 \u00e1p l\u1ef1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Kh\u00f4ng ch\u1ec9 ri\u00eang\u00a0b\u00e0i t\u1eadp n\u00e2ng cao l\u1edbp 2 m\u00e0 khi b\u00e9 h\u1ecdc b\u1ea5t c\u1ee9 m\u00f4n h\u1ecdc n\u00e0o \u0111i ch\u0103ng n\u1eefa th\u00ec ba m\u1eb9 c\u0169ng kh\u00f4ng n\u00ean t\u1ea1o cho con s\u1ef1 \u00e1p l\u1ef1c. Khi c\u00e1c b\u1ea1n nh\u1ecf c\u1ea3m th\u1ea5y \u00e1p l\u1ef1c th\u00ec hi\u1ec7u qu\u1ea3 h\u1ecdc t\u1eadp c\u1ee7a c\u00e1c con \u00edt nh\u1ea5t s\u1ebd gi\u1ea3m \u0111i t\u1eeb 30 \u0111\u1ebfn 50%.<\/p>\n<p dir=\"ltr\">L\u1eddi khuy\u00ean d\u00e0nh cho c\u00e1c b\u1eadc ph\u1ee5 huynh \u0111\u00f3 ch\u00ednh l\u00e0 n\u00ean t\u1ea1o cho b\u00e9 m\u1ed9t t\u00e2m l\u00fd tho\u1ea3i m\u00e1i \u0111\u1ec3 c\u00e1c con c\u00f3 th\u1ec3 h\u1ecdc t\u1eadp t\u1ed1t h\u01a1n. B\u1ed1 m\u1eb9 n\u00ean d\u00e0nh th\u1eddi gian t\u00ecm cho b\u00e9 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc ph\u00f9 h\u1ee3p v\u1edbi s\u1edf th\u00edch c\u1ee7a c\u00e1c b\u1ea1n nh\u1ecf.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giup_cho_be_nam_chac_kien_thuc_co_ban\"><\/span>Gi\u00fap cho b\u00e9 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Vi\u1ec7c gi\u00fap cho b\u00e9 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n l\u00e0 \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng khi h\u1ecdc To\u00e1n l\u1edbp 2, bi\u1ec7t l\u00e0 to\u00e1n n\u00e2ng cao c\u00f3 l\u1eddi gi\u1ea3i. B\u1edfi n\u1ebfu nh\u01b0 c\u00e1c b\u00e9 kh\u00f4ng n\u1eafm ch\u1eafc \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n th\u00ec c\u00e1c con s\u1ebd kh\u00f4ng th\u1ec3 l\u00e0m b\u01b0\u1edbc \u0111\u1ec7m \u0111\u1ec3 ti\u1ebfp thu ki\u1ebfn th\u1ee9c n\u00e2ng cao.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/45-toan-lop-2-nang-cao-co-loi-giai.jpg\" alt=\"B\u1ed1 m\u1eb9 c\u1ea7n \u0111\u1ea3m b\u1ea3o c\u00e1c b\u1ea1n nh\u1ecf \u0111\u00e3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n tr\u01b0\u1edbc khi h\u1ecdc to\u00e1n n\u00e2ng cao (Ngu\u1ed3n \u1ea3nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Do \u0111\u00f3 b\u1ed1 m\u1eb9 kh\u00f4ng n\u00ean n\u00f3ng l\u00f2ng cho con h\u1ecdc to\u00e1n n\u00e2ng cao l\u1edbp 2 v\u1ed9i m\u00e0 c\u1ea7n ph\u1ea3i trang b\u1ecb ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n cho b\u00e9 \u0111\u1ea7y \u0111\u1ee7 tr\u01b0\u1edbc \u0111\u00e3. Khi b\u00e9 \u0111\u00e3 c\u00f3 n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n th\u00ec c\u00e1c con c\u0169ng c\u00f3 th\u1ec3 ti\u1ebfp thu v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh ki\u1ebfn th\u1ee9c n\u00e2ng cao m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Phu_huynh_nen_danh_gia_nang_luc_de_chon_cho_con_chuong_trinh_hoc_phu_hop\"><\/span>Ph\u1ee5 huynh n\u00ean \u0111\u00e1nh gi\u00e1 n\u0103ng l\u1ef1c \u0111\u1ec3 ch\u1ecdn cho con ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc ph\u00f9 h\u1ee3p<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Vi\u1ec7c ch\u1ecdn cho b\u00e9 m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc ph\u00f9 h\u1ee3p th\u1ef1c s\u1ef1 r\u1ea5t quan tr\u1ecdng. B\u1edfi ki\u1ebfn th\u1ee9c To\u00e1n n\u00e2ng cao l\u1edbp 2 \u0111\u00f4i khi kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng b\u1ea1n nh\u1ecf ti\u1ebfp thu ch\u1eadm. Do \u0111\u00f3 b\u1ed1 m\u1eb9 c\u1ea7n ph\u1ea3i ki\u1ec3m tra, \u0111\u00e1nh gi\u00e1 n\u0103ng l\u1ef1c c\u1ee7a b\u00e9 m\u1ed9t c\u00e1ch k\u1ef9 l\u01b0\u1ee1ng r\u1ed3i m\u1edbi \u0111\u01b0a ra cho con m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc ph\u00f9 h\u1ee3p. C\u00f3 nh\u01b0 v\u1eady th\u00ec c\u00e1c b\u1ea1n nh\u1ecf s\u1ebd ti\u1ebfp thu ki\u1ebfn th\u1ee9c hi\u1ec7u qu\u1ea3 h\u01a1n c\u0169ng nh\u01b0 kh\u00f4ng c\u1ea3m th\u1ea5y ch\u00e1n n\u1ea3n.<\/p>\n<p dir=\"ltr\">V\u1edbi nh\u1eefng th\u00f4ng tin chia s\u1ebb v\u1ec1 To\u00e1n l\u1edbp 2 n\u00e2ng cao c\u00f3 l\u1eddi gi\u1ea3i tr\u00ean \u0111\u00e2y, c\u00e1c b\u1eadc ph\u1ee5 huynh \u0111\u00e3 bi\u1ebft n\u00ean cho b\u00e9 h\u1ecdc nh\u01b0 th\u1ebf n\u00e0o hay ch\u01b0a. Hi v\u1ecdng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef c\u00f3 th\u1ec3 \u0111\u1ed3ng h\u00e0nh c\u00f9ng v\u1edbi c\u00e1c b\u1ea1n nh\u1ecf tr\u00ean con \u0111\u01b0\u1eddng h\u1ecdc t\u1eadp \u0111\u1ec3 b\u00e9 h\u1ecdc t\u1ed1t To\u00e1n h\u01a1n.<\/p>\n<table style=\"border-collapse: collapse;margin-left: auto;margin-right: auto;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5932%;background-color: #2dc26b;text-align: center\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef &#8211; L\u1ef1a Ch\u1ecdn T\u1ed1t Nh\u1ea5t Cho M\u1ecdi Tr\u1ebb Em M\u1edbi B\u1eaft \u0110\u1ea7u H\u1ecdc Ti\u1ebfng Anh. Ba m\u1eb9 h\u00e3y T\u1ea2I APP v\u00e0 \u0110\u0102NG K\u00dd G\u00d3I H\u1eccC ngay h\u00f4m nay \u0111\u1ec3 gi\u00fap con ghi nh\u1edb h\u01a1n 10.000 t\u1eeb v\u1ef1ng ch\u1ec9 v\u1edbi 15 ph\u00fat h\u1ecdc m\u1ed7i ng\u00e0y v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u qu\u00e0 t\u1eb7ng h\u1ea5p d\u1eabn kh\u00e1c.  <img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia.monkeyuni.net\/upload\/web\/img\/nhantuvanmienphi.png\" width=\"185\"><\/td>\n<\/tr>\n<\/table>\n<p dir=\"ltr\">Xem th\u00eam:<\/p>\n<ul>\n<li dir=\"ltr\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u00e0 g\u00ec? B\u00e0i t\u1eadp v\u00e0 b\u00ed quy\u1ebft th\u1ef1c h\u00e0nh hi\u1ec7u qu\u1ea3<\/li>\n<li dir=\"ltr\">H\u00ecnh tam gi\u00e1c l\u00e0 g\u00ec? T\u1ea5t t\u1ea7n t\u1eadt ki\u1ebfn th\u1ee9c chi ti\u1ebft \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t<\/li>\n<li dir=\"ltr\">G\u1ee3i \u00fd \u0111\u1ec1 to\u00e1n l\u1edbp 1 n\u00e2ng cao c\u00f3 h\u01b0\u1edbng d\u1eabn gi\u1ea3i gi\u00fap con \u0111\u1ea1t k\u1ebft qu\u1ea3 t\u1ed1t<\/li>\n<\/ul>\n<p>Ngu\u1ed3n: <a href=\"http:\/\/www.ckconitsha.com\/vn\/\">http:\/\/www.ckconitsha.com\/vn\/<\/a> T\u00e1c gi\u1ea3: <a href=\"https:\/\/www.ckconitsha.com\/vn\/author\/nguyenlandung\">Nguy\u1ec5n L\u00e2n d\u0169ng<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u1ed5ng h\u1ee3p c\u00e1c b\u00e0i t\u1eadp\u00a0to\u00e1n n\u00e2ng cao l\u1edbp 2 c\u00f3 \u0111\u00e1p \u00e1n c\u00f9ng nhi\u1ec1u b\u00ed quy\u1ebft gi\u00fap b\u00e9 chinh ph\u1ee5c ki\u1ebfn th\u1ee9c n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. H\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef t\u00ecm hi\u1ec3u r\u00f5 h\u01a1n ngay trong b\u00e0i vi\u1ebft sau \u0111\u00e2y nh\u00e9. T\u1ea7m quan tr\u1ecdng khi gi\u1ea3i to\u00e1n l\u1edbp 2&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-40726","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/40726","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/comments?post=40726"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/40726\/revisions"}],"predecessor-version":[{"id":40783,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/40726\/revisions\/40783"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=40726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=40726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=40726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}