{"id":21813,"date":"2025-07-08T23:00:52","date_gmt":"2025-07-08T16:00:52","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=21813"},"modified":"2025-07-08T23:00:52","modified_gmt":"2025-07-08T16:00:52","slug":"cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/","title":{"rendered":"C\u00e1c d\u1ea1ng to\u00e1n \u1edf Ti\u1ec3u h\u1ecdc t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao v\u00e0 h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft"},"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\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Cac_dang_toan_tieu_hoc_va_cach_giai_chi_tiet\" >C\u00e1c d\u1ea1ng to\u00e1n ti\u1ec3u h\u1ecdc v\u00e0 c\u00e1ch gi\u1ea3i chi ti\u1ebft<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Dang_1_So_chan_so_le_va_dang_bai_toan_xet_chu_so_tan_cung_cua_mot_so\" >D\u1ea1ng 1: S\u1ed1 ch\u1eb5n, s\u1ed1 l\u1ebb v\u00e0 d\u1ea1ng b\u00e0i to\u00e1n x\u00e9t ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a m\u1ed9t s\u1ed1<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Ly_thuyet_can_nho\" >L\u00fd thuy\u1ebft c\u1ea7n nh\u1edb:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Cac_dang_bai_tap_van_dung\" >C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng:<\/a><\/li><\/ul><\/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\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Dang_2_Dang_bai_toan_so_sanh_Nhieu_hon_%E2%80%93_it_hon\" >D\u1ea1ng 2: D\u1ea1ng b\u00e0i to\u00e1n so s\u00e1nh (Nhi\u1ec1u h\u01a1n &#8211; \u00edt h\u01a1n)<\/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\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Dang_3_Cac_dang_bai_toan_gap_bao_nhieu_lan_va_giam_bao_nhieu_lan\" >D\u1ea1ng 3: C\u00e1c d\u1ea1ng b\u00e0i to\u00e1n g\u1ea5p bao nhi\u00eau l\u1ea7n v\u00e0 gi\u1ea3m bao nhi\u00eau l\u1ea7n<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Cac_bai_toan_giam_bao_nhieu_lan\" >C\u00e1c b\u00e0i to\u00e1n gi\u1ea3m bao nhi\u00eau l\u1ea7n:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Cac_bai_toan_gap_bao_nhieu_lan\" >C\u00e1c b\u00e0i to\u00e1n g\u1ea5p bao nhi\u00eau l\u1ea7n:<\/a><\/li><\/ul><\/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\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Dang_4_Bai_toan_dieu_kien_chia_het\" >D\u1ea1ng 4: B\u00e0i to\u00e1n \u0111i\u1ec1u ki\u1ec7n chia h\u1ebft<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Loai_1_cac_dang_toan_ve_so_tu_nhien_o_tieu_hoc_theo_dau_hieu_chia_het\" >Lo\u1ea1i 1: c\u00e1c d\u1ea1ng to\u00e1n v\u1ec1 s\u1ed1 t\u1ef1 nhi\u00ean \u1edf ti\u1ec3u h\u1ecdc theo d\u1ea5u hi\u1ec7u chia h\u1ebft.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Loai_2_Loai_toan_dung_dau_hieu_chia_het_de_dien_vao_chu_so_chua_biet\" >Lo\u1ea1i 2: Lo\u1ea1i to\u00e1n d\u00f9ng d\u1ea5u hi\u1ec7u chia h\u1ebft \u0111\u1ec3 \u0111i\u1ec1n v\u00e0o ch\u1eef s\u1ed1 ch\u01b0a bi\u1ebft.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Loai_3_Cac_bai_toan_ve_van_dung_tinh_chat_chia_het_cua_mot_tong_va_mot_hieu\" >Lo\u1ea1i 3: C\u00e1c b\u00e0i to\u00e1n v\u1ec1 v\u1eadn d\u1ee5ng t\u00ednh ch\u1ea5t chia h\u1ebft c\u1ee7a m\u1ed9t t\u1ed5ng v\u00e0 m\u1ed9t hi\u1ec7u.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Loai_4_Cac_bai_toan_ve_phep_chia_co_du\" >Lo\u1ea1i 4: C\u00e1c b\u00e0i to\u00e1n v\u1ec1 ph\u00e9p chia c\u00f3 d\u01b0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Loai_5_Van_dung_tinh_chat_chia_het_va_chia_con_du_de_giai_cac_dang_toan_co_loi_van_o_tieu_hoc\" >Lo\u1ea1i 5: V\u1eadn d\u1ee5ng t\u00ednh ch\u1ea5t chia h\u1ebft v\u00e0 chia c\u00f2n d\u01b0 \u0111\u1ec3 gi\u1ea3i c\u00e1c d\u1ea1ng to\u00e1n c\u00f3 l\u1eddi v\u0103n \u1edf ti\u1ec3u h\u1ecdc<\/a><\/li><\/ul><\/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\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Dang_5_Tinh_nhanh_bang_cac_tinh_chat_bat_bien_cua_phep_tinh\" >D\u1ea1ng 5: T\u00ednh nhanh b\u1eb1ng c\u00e1c t\u00ednh ch\u1ea5t b\u1ea5t bi\u1ebfn c\u1ee7a ph\u00e9p t\u00ednh<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#On_luyen_nhanh_mon_Toan_voi_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\" >\u00d4n luy\u1ec7n nhanh m\u00f4n To\u00e1n v\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ckconitsha.com\/vn\/cac-dang-toan-o-tieu-hoc-tu-co-ban-den-nang-cao-va-huong-dan-giai-chi-tiet\/#Mot_so_luu_y_khi_bo_me_day_be_hoc_cac_dang_toan_o_tieu_hoc\" >M\u1ed9t s\u1ed1 l\u01b0u \u00fd khi b\u1ed1 m\u1eb9 d\u1ea1y b\u00e9 h\u1ecdc c\u00e1c d\u1ea1ng to\u00e1n \u1edf ti\u1ec3u h\u1ecdc<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>\u0110\u1ec3 d\u1ec5 d\u00e0ng h\u01a1n cho c\u00e1c b\u1ea1n trong vi\u1ec7c n\u1eafm b\u1eaft v\u00e0 \u00f4n luy\u1ec7n c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 m\u00f4n to\u00e1n cho tr\u1ebb t\u1ea1i nh\u00e0. Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd t\u1ed5ng h\u1ee3p h\u1ea7u h\u1ebft c\u00e1c d\u1ea1ng to\u00e1n \u1edf Ti\u1ec3u h\u1ecdc th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch \u0111\u1ec3 gi\u1ea3i ch\u00fang ngay trong b\u00e0i vi\u1ebft n\u00e0y.\u00a0<\/p>\n<p>                                    <\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dang_toan_tieu_hoc_va_cach_giai_chi_tiet\"><\/span>C\u00e1c d\u1ea1ng to\u00e1n ti\u1ec3u h\u1ecdc v\u00e0 c\u00e1ch gi\u1ea3i chi ti\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00f3 r\u1ea5t nhi\u1ec1u b\u00e0i to\u00e1n ti\u1ec3u h\u1ecdc m\u00e0 tr\u1ebb s\u1ebd \u0111\u01b0\u1ee3c l\u00e0m quen t\u1eeb l\u1edbp 1 \u0111\u1ebfn l\u1edbp 5. Tuy nhi\u00ean, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef ch\u1ec9 li\u1ec7t k\u00ea 5 d\u1ea1ng b\u00e0i to\u00e1n th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u0169ng l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 ph\u00e1t tri\u1ec3n n\u00ean c\u00e1c d\u1ea1ng b\u00e0i to\u00e1n kh\u00e1c nhau. Vi\u1ec7c t\u1ed1i \u01b0u l\u1ea1i c\u00e1c d\u1ea1ng to\u00e1n \u0111i\u1ec3n h\u00ecnh \u1edf ti\u1ec3u h\u1ecdc m\u00e0 tr\u1ebb c\u1ea7n h\u1ecdc, c\u0169ng gi\u00fap tr\u1ebb d\u1ec5 d\u00e0ng bi\u1ebft \u0111\u01b0\u1ee3c \u0111\u00e2u l\u00e0 c\u00e1c ki\u1ebfn th\u1ee9c quan tr\u1ecdng trong c\u1ea3 ch\u01b0\u01a1ng tr\u00ecnh.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_1_So_chan_so_le_va_dang_bai_toan_xet_chu_so_tan_cung_cua_mot_so\"><\/span>D\u1ea1ng 1: S\u1ed1 ch\u1eb5n, s\u1ed1 l\u1ebb v\u00e0 d\u1ea1ng b\u00e0i to\u00e1n x\u00e9t ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a m\u1ed9t s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ly_thuyet_can_nho\"><\/span>L\u00fd thuy\u1ebft c\u1ea7n nh\u1edb:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a 1 t\u1ed5ng b\u1eb1ng ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a t\u1ed5ng c\u00e1c ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb c\u1ee7a c\u00e1c s\u1ed1 h\u1ea1ng trong t\u1ed5ng \u1ea5y.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a 1 t\u00edch b\u1eb1ng ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a t\u00edch c\u00e1c ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb c\u1ee7a c\u00e1c th\u1eeba s\u1ed1 trong t\u00edch \u1ea5y.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ed5ng 1 + 2 + 3 + 4 + &#8230;&#8230; + 9 c\u00f3 ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng b\u1eb1ng 5.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00edch 1 x 3 x 5 x 7 x 9 c\u00f3 ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng b\u1eb1ng 5.<\/p>\n<\/li>\n<\/ul>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dang_bai_tap_van_dung\"><\/span>C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 1: C\u00f3 th\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c 2 s\u1ed1 t\u1ef1 nhi\u00ean sao cho hi\u1ec7u c\u1ee7a ch\u00fang nh\u00e2n v\u1edbi 18 \u0111\u01b0\u1ee3c 1989 kh\u00f4ng?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Ta th\u1ea5y s\u1ed1 n\u00e0o nh\u00e2n v\u1edbi s\u1ed1 ch\u1eb5n t\u00edch c\u0169ng l\u00e0 1 s\u1ed1 ch\u1eb5n. 18 l\u00e0 s\u1ed1 ch\u1eb5n m\u00e0 1989 l\u00e0 s\u1ed1 l\u1ebb.<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady kh\u00f4ng th\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c 2 s\u1ed1 t\u1ef1 nhi\u00ean m\u00e0 hi\u1ec7u c\u1ee7a ch\u00fang nh\u00e2n v\u1edbi 18 \u0111\u01b0\u1ee3c 1989.<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 2: C\u00f3 s\u1ed1 t\u1ef1 nhi\u00ean n\u00e0o nh\u00e2n v\u1edbi ch\u00ednh n\u00f3 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t s\u1ed1 vi\u1ebft b\u1edfi 6 ch\u1eef s\u1ed1 1 kh\u00f4ng?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">G\u1ecdi s\u1ed1 ph\u1ea3i t\u00ecm l\u00e0 A (A &gt; 0)<\/p>\n<p dir=\"ltr\">Ta c\u00f3: A x A = 111 111\u00a0<\/p>\n<p dir=\"ltr\">V\u00ec 1 + 1 +1\u00a0 + 1+ 1+ 1+ = 6\u00a0 chia h\u1ebft cho 3 n\u00ean 111 111 chia h\u1ebft cho 3.<\/p>\n<p dir=\"ltr\">Do v\u1eady A chia h\u1ebft cho 3, m\u00e0 A chia h\u1ebft cho 3 n\u00ean A \u00ec A chia h\u1ebft cho 9 nh\u01b0ng 111 111 kh\u00f4ng chia h\u1ebft cho 9.<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 3: B\u1ea1n To\u00e0n t\u00ednh t\u1ed5ng c\u00e1c ch\u1eb5n trong ph\u1ea1m vi t\u1eeb 20 \u0111\u1ebfn 98 \u0111\u01b0\u1ee3c 2025. Kh\u00f4ng th\u1ef1c hi\u1ec7n t\u00ednh t\u1ed5ng em cho bi\u1ebft To\u00e0n t\u00ednh \u0111\u00fang hay sai?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">T\u1ed5ng c\u00e1c s\u1ed1 ch\u1eb5n l\u00e0 1 s\u1ed1 ch\u1eb5n, k\u1ebft qu\u1ea3 to\u00e0n t\u00ednh \u0111\u01b0\u1ee3c 2025 l\u00e0 s\u1ed1 l\u1ebb do v\u1eady to\u00e0n \u0111\u00e3 t\u00ednh sai.<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 4:<\/p>\n<p dir=\"ltr\">a\/ N\u1ebfu t\u1ed5ng c\u1ee7a 2 s\u1ed1 t\u1ef1 nhi\u00ean l\u00e0 1 s\u1ed1 l\u1ebb, th\u00ec t\u00edch c\u1ee7a ch\u00fang c\u00f3 th\u1ec3 l\u00e0 1 s\u1ed1 l\u1ebb \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>\n<p dir=\"ltr\">b\/ N\u1ebfu t\u00edch c\u1ee7a 2 s\u1ed1 t\u1ef1 nhi\u00ean l\u00e0 1 s\u1ed1 l\u1ebb, th\u00ec t\u1ed5ng c\u1ee7a ch\u00fang c\u00f3 th\u1ec3 l\u00e0 1 s\u1ed1 l\u1ebb \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>\n<p dir=\"ltr\">c\/ \u201cT\u1ed5ng\u201d v\u00e0 \u201chi\u1ec7u\u201d hai s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 th\u1ec3 l\u00e0 s\u1ed1 ch\u1eb5n, v\u00e0 s\u1ed1 kia l\u00e0 l\u1ebb \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">a\/ T\u1ed5ng hai s\u1ed1 t\u1ef1 nhi\u00ean l\u00e0 m\u1ed9t s\u1ed1 l\u1ebb, nh\u01b0 v\u1eady t\u1ed5ng \u0111\u00f3 g\u1ed3m 1 s\u1ed1 ch\u1eb5n v\u00e0 1 s\u1ed1 l\u1ebb, do \u0111\u00f3 t\u00edch c\u1ee7a ch\u00fang ph\u1ea3i l\u00e0 1 s\u1ed1 ch\u1eb5n (Kh\u00f4ng th\u1ec3 l\u00e0 m\u1ed9t s\u1ed1 l\u1ebb \u0111\u01b0\u1ee3c).<\/p>\n<p dir=\"ltr\">b\/ T\u00edch hai s\u1ed1 t\u1ef1 nhi\u00ean l\u00e0 1 s\u1ed1 l\u1ebb, nh\u01b0 v\u1eady t\u00edch \u0111\u00f3 g\u1ed3m 2 th\u1eeba s\u1ed1 \u0111\u1ec1u l\u00e0 s\u1ed1 l\u1ebb, do \u0111\u00f3 t\u1ed5ng c\u1ee7a ch\u00fang ph\u1ea3i l\u00e0 1 s\u1ed1 ch\u1eb5n(Kh\u00f4ng th\u1ec3 l\u00e0 m\u1ed9t s\u1ed1 l\u1ebb \u0111\u01b0\u1ee3c).<\/p>\n<p dir=\"ltr\">c\/ L\u1ea5y \u201cT\u1ed5ng\u201d c\u1ed9ng v\u1edbi \u201chi\u1ec7u\u201d ta \u0111\u01b0\u1ee3c 2 l\u1ea7n s\u1ed1 l\u1edbn, t\u1ee9c l\u00e0 \u0111\u01b0\u1ee3c 1 s\u1ed1 ch\u1eb5n. V\u1eady \u201ct\u1ed5ng\u201d v\u00e0 \u201chi\u1ec7u\u201d ph\u1ea3i l\u00e0 2 s\u1ed1 c\u00f9ng ch\u1eb5n ho\u1eb7c c\u00f9ng l\u1ebb (Kh\u00f4ng th\u1ec3 1 s\u1ed1 l\u00e0 ch\u1eb5n, s\u1ed1 kia l\u00e0 l\u1ebb \u0111\u01b0\u1ee3c).<\/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\/2-cac-dang-toan-o-tieu-hoc.jpg\" alt=\"C\u00e1c d\u1ea1ng b\u00e0i to\u00e1n th\u01b0\u1eddng g\u1eb7p \u1edf ti\u1ec3u h\u1ecdc. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_2_Dang_bai_toan_so_sanh_Nhieu_hon_%E2%80%93_it_hon\"><\/span>D\u1ea1ng 2: D\u1ea1ng b\u00e0i to\u00e1n so s\u00e1nh (Nhi\u1ec1u h\u01a1n &#8211; \u00edt h\u01a1n)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 h\u01b0\u1edbng d\u1eabn cho b\u00e9 nh\u00e0 t\u1eadp gi\u1ea3i t\u1ea1i nh\u00e0:<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 1: Ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c 18 c\u00e2y hoa. Em tr\u1ed3ng \u0111\u01b0\u1ee3c \u00edt h\u01a1n ch\u1ecb 7 c\u00e2y hoa. H\u1ecfi em tr\u1ed3ng \u0111\u01b0\u1ee3c bao nhi\u00eau c\u00e2y hoa?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Em tr\u1ed3ng \u0111\u01b0\u1ee3c s\u1ed1 c\u00e2y hoa l\u00e0: 18 \u2013 7 = 11 (c\u00e2y)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 11 c\u00e2y hoa<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 2: Em tr\u1ed3ng \u0111\u01b0\u1ee3c 8 c\u00e2y hoa. Em tr\u1ed3ng \u0111\u01b0\u1ee3c \u00edt h\u01a1n ch\u1ecb 6 c\u00e2y hoa. H\u1ecfi ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c m\u1ea5y c\u00e2y hoa?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c s\u1ed1 c\u00e2y hoa l\u00e0: 8 + 6 = 14 (c\u00e2y)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 14 c\u00e2y hoa<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 3: Em tr\u1ed3ng \u0111\u01b0\u1ee3c 8 c\u00e2y hoa. Ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01a1n em 5 c\u00e2y hoa. H\u1ecfi ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c bao nhi\u00eau c\u00e2y hoa?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c s\u1ed1 c\u00e2y hoa l\u00e0: 8 + 5 = 13 (c\u00e2y)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 13 c\u00e2y hoa<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 4: Em tr\u1ed3ng \u0111\u01b0\u1ee3c 8 c\u00e2y hoa, ch\u1ecb tr\u1ed3ng \u0111\u01b0\u1ee3c 14 c\u00e2y hoa. H\u1ecfi em tr\u1ed3ng \u0111\u01b0\u1ee3c \u00edt h\u01a1n ch\u1ecb m\u1ea5y c\u00e2y hoa?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Em tr\u1ed3ng \u0111\u01b0\u1ee3c \u00edt h\u01a1n s\u1ed1 c\u00e2y hoa l\u00e0: 14 \u2013 8 = 6 (c\u00e2y)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 6 c\u00e2y hoa<\/p>\n<p dir=\"ltr\">Xem th\u00eam: N\u00ean ch\u1ecdn app h\u1ecdc To\u00e1n c\u1ea5p 1 mi\u1ec5n ph\u00ed hay tr\u1ea3 ph\u00ed cho con? V\u00e0 top 5 \u1ee9ng d\u1ee5ng uy t\u00edn nh\u1ea5t hi\u1ec7n nay<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_3_Cac_dang_bai_toan_gap_bao_nhieu_lan_va_giam_bao_nhieu_lan\"><\/span>D\u1ea1ng 3: C\u00e1c d\u1ea1ng b\u00e0i to\u00e1n g\u1ea5p bao nhi\u00eau l\u1ea7n v\u00e0 gi\u1ea3m bao nhi\u00eau l\u1ea7n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_bai_toan_giam_bao_nhieu_lan\"><\/span>C\u00e1c b\u00e0i to\u00e1n gi\u1ea3m bao nhi\u00eau l\u1ea7n:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 1: Hoa c\u00f3 40 c\u00e1i b\u00e1nh, sau khi bi\u1ebfu \u00f4ng b\u00e0 m\u1ed9t s\u1ed1 b\u00e1nh th\u00ec Hoa c\u00f2n l\u1ea1i 10 c\u00e1i b\u00e1nh. H\u1ecfi s\u1ed1 b\u00e1nh c\u1ee7a Hoa gi\u1ea3m \u0111i m\u1ea5y l\u1ea7n?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">S\u1ed1 b\u00e1nh c\u1ee7a Hoa gi\u1ea3m \u0111i s\u1ed1 l\u1ea7n l\u00e0: 40 : 10 = 4 (l\u1ea7n)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 4 l\u1ea7n<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 2: Hoa c\u00f3 40 c\u00e1i b\u00e1nh, sau khi bi\u1ebfu \u00f4ng b\u00e0 m\u1ed9t s\u1ed1 c\u00e1i b\u00e1nh th\u00ec s\u1ed1 b\u00e1nh c\u1ee7a Hoa gi\u1ea3m \u0111i 4 l\u1ea7n. H\u1ecfi Hoa c\u00f2n l\u1ea1i bao nhi\u00eau c\u00e1i b\u00e1nh?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">S\u1ed1 b\u00e1nh Hoa c\u00f2n l\u1ea1i l\u00e0: 40 : 4 = 10 (c\u00e1i)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 10 c\u00e1i b\u00e1nh<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_bai_toan_gap_bao_nhieu_lan\"><\/span>C\u00e1c b\u00e0i to\u00e1n g\u1ea5p bao nhi\u00eau l\u1ea7n:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 1: B\u1ed1 b\u1eaft \u0111\u01b0\u1ee3c 12 con c\u00e1, b\u1ed1 b\u1eaft \u0111\u01b0\u1ee3c g\u1ea5p 3 l\u1ea7n s\u1ed1 c\u00e1 c\u1ee7a con. H\u1ecfi con b\u1eaft \u0111\u01b0\u1ee3c bao nhi\u00eau con c\u00e1?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Con b\u1eaft \u0111\u01b0\u1ee3c s\u1ed1 c\u00e1 l\u00e0: 12 : 3 = 4 (con)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 4 con c\u00e1<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 2: Con b\u1eaft \u0111\u01b0\u1ee3c 4 con c\u00e1, b\u1ed1 b\u1eaft \u0111\u01b0\u1ee3c g\u1ea5p 3 l\u1ea7n s\u1ed1 c\u00e1 c\u1ee7a con. H\u1ecfi b\u1ed1 b\u1eaft \u0111\u01b0\u1ee3c bao nhi\u00eau con c\u00e1?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">S\u1ed1 c\u00e1 b\u1ed1 b\u1eaft \u0111\u01b0\u1ee3c l\u00e0: 3 x 4 = 12 (con)<\/p>\n<p dir=\"ltr\">\u0110\u00e1p s\u1ed1: 12 con c\u00e1<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_4_Bai_toan_dieu_kien_chia_het\"><\/span>D\u1ea1ng 4: B\u00e0i to\u00e1n \u0111i\u1ec1u ki\u1ec7n chia h\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ed1i v\u1edbi d\u1ea1ng to\u00e1n ti\u1ec3u h\u1ecdc n\u00e0y, s\u1ebd c\u00f3 5 lo\u1ea1i b\u00e0i t\u1eadp ch\u00ednh m\u00e0 b\u00e9 s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc nh\u01b0:<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Loai_1_cac_dang_toan_ve_so_tu_nhien_o_tieu_hoc_theo_dau_hieu_chia_het\"><\/span>Lo\u1ea1i 1: c\u00e1c d\u1ea1ng to\u00e1n v\u1ec1 s\u1ed1 t\u1ef1 nhi\u00ean \u1edf ti\u1ec3u h\u1ecdc theo d\u1ea5u hi\u1ec7u chia h\u1ebft.<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng: H\u00e3y thi\u1ebft l\u1eadp c\u00e1c s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 kh\u00e1c nhau t\u1eeb 4 ch\u1eef s\u1ed1 0, 4, 5, 9 tho\u1ea3 m\u00e3n \u0111i\u1ec1u ki\u1ec7n<\/p>\n<p dir=\"ltr\">a\/ Chia h\u1ebft cho 2<\/p>\n<p dir=\"ltr\">b\/ Chia h\u1ebft cho 4<\/p>\n<p dir=\"ltr\">c\/ Chia h\u1ebft cho 2 v\u00e0 5<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">a\/ C\u00e1c s\u1ed1 chia h\u1ebft cho 2 c\u00f3 t\u1eadn c\u00f9ng b\u1eb1ng 0 ho\u1eb7c 4. M\u1eb7t kh\u00e1c m\u1ed7i s\u1ed1 \u0111\u1ec1u c\u00f3 c\u00e1c ch\u1eef s\u1ed1 kh\u00e1c nhau, n\u00ean c\u00e1c s\u1ed1 thi\u1ebft l\u1eadp \u0111\u01b0\u1ee3c l\u00e0: 540; 504; 940; 904; 450; 954; 950; 594; 490; 590<\/p>\n<p dir=\"ltr\">b\/ Ta c\u00f3 c\u00e1c s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 chia h\u1ebft cho 4 \u0111\u01b0\u1ee3c vi\u1ebft t\u1eeb 4 ch\u1eef s\u1ed1 \u0111\u00e3 cho l\u00e0: 540; 504; 940; 904<\/p>\n<p dir=\"ltr\">c; S\u1ed1 chia h\u1ebft cho 2 v\u00e0 5 ph\u1ea3i c\u00f3 t\u1eadn c\u00f9ng 0. V\u1eady c\u00e1c s\u1ed1 c\u1ea7n t\u00ecm l\u00e0: 540; 450;490; 940; 950; 590<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Loai_2_Loai_toan_dung_dau_hieu_chia_het_de_dien_vao_chu_so_chua_biet\"><\/span>Lo\u1ea1i 2: Lo\u1ea1i to\u00e1n d\u00f9ng d\u1ea5u hi\u1ec7u chia h\u1ebft \u0111\u1ec3 \u0111i\u1ec1n v\u00e0o ch\u1eef s\u1ed1 ch\u01b0a bi\u1ebft.<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng: Cho n = a378b l\u00e0 s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 5 ch\u1eef s\u1ed1 kh\u00e1c nhau. T\u00ecm t\u1ea5t c\u1ea3 c\u00e1c ch\u1eef s\u1ed1 a v\u00e0 b \u0111\u1ec3 thay v\u00e0o ta d\u01b0\u1ee3c s\u1ed1 n chia h\u1ebft cho 3 v\u00e0 4.<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">n chia h\u1ebft cho 4 th\u00ec 8b ph\u1ea3i chia h\u1ebft cho 4. V\u1eady b = 0, 4 ho\u1eb7c 8<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">n c\u00f3 5 ch\u1eef s\u1ed1 kh\u00e1c nhau n\u00ean b = 0 ho\u1eb7c 4<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Thay b = 0 th\u00ec n = a3780<\/p>\n<\/li>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 a3780 chia h\u1ebft cho 3 th\u00ec a = 3, 6 ho\u1eb7c 9<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 n c\u00f3 5 ch\u1eef s\u1ed1 kh\u00e1c nhau n\u00ean a = 6 ho\u1eb7c 9<\/p>\n<\/li>\n<\/ul>\n<\/ul>\n<p dir=\"ltr\">Ta \u0111\u01b0\u1ee3c c\u00e1c s\u1ed1 63 780 v\u00e0 930780 tho\u1ea3 m\u00e3n \u0111i\u1ec1u ki\u1ec7n c\u1ee7a \u0111\u1ec1 b\u00e0i<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Thay b = 4 th\u00ec n = a3784<\/p>\n<\/li>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 a3784 chia h\u1ebft cho 3 th\u00ec a = 2, 5 ho\u1eb7c 8<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 n c\u00f3 5 ch\u1eef s\u1ed1 kh\u00e1c nhau n\u00ean a = 2 ho\u1eb7c 5. Ta \u0111\u01b0\u1ee3c c\u00e1c s\u1ed1 23784 v\u00e0 53 784 tho\u1ea3 m\u00e3n \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec1 b\u00e0i.<\/p>\n<\/li>\n<\/ul>\n<\/ul>\n<p dir=\"ltr\">C\u00e1c s\u1ed1 ph\u1ea3i t\u00ecm l\u00e0 63780; 93780; 23784; 53784.<\/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\/3-cac-dang-toan-o-tieu-hoc.jpg\" alt=\"T\u1ea5t c\u1ea3 c\u00e1c d\u1ea1ng b\u00e0i to\u00e1n \u0111i\u1ec1u ki\u1ec7n chia h\u1ebft \u1edf ti\u1ec3u h\u1ecdc. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Loai_3_Cac_bai_toan_ve_van_dung_tinh_chat_chia_het_cua_mot_tong_va_mot_hieu\"><\/span>Lo\u1ea1i 3: C\u00e1c b\u00e0i to\u00e1n v\u1ec1 v\u1eadn d\u1ee5ng t\u00ednh ch\u1ea5t chia h\u1ebft c\u1ee7a m\u1ed9t t\u1ed5ng v\u00e0 m\u1ed9t hi\u1ec7u.<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">L\u00fd thuy\u1ebft c\u1ea7n nh\u1edb:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu m\u1ed7i s\u1ed1 h\u1ea1ng c\u1ee7a t\u1ed5ng \u0111\u1ec1u chia h\u1ebft cho 2 th\u00ec t\u1ed5ng c\u1ee7a ch\u00fang c\u0169ng chia h\u1ebft cho 2<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu SBT v\u00e0 ST \u0111\u1ec1u chia h\u1ebft cho 2 th\u00ec hi\u1ec7u c\u1ee7a ch\u00fang c\u0169ng chia h\u1ebft cho 2<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">M\u1ed9t s\u1ed1 h\u1ea1ng kh\u00f4ng chia h\u1ebft cho 2, c\u00e1c s\u1ed1 h\u1ea1ng c\u00f2n l\u1ea1i chia h\u1ebft cho 2 th\u00ec t\u1ed5ng kh\u00f4ng chia h\u1ebft cho 2<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hi\u1ec7u c\u1ee7a 1 s\u1ed1 chia h\u1ebft cho 2 v\u00e0 1 s\u1ed1 kh\u00f4ng chia h\u1ebft cho 2 l\u00e0 1 s\u1ed1 kh\u00f4ng chia h\u1ebft cho 2. (T\u00ednh ch\u1ea5t n\u00e0y t\u01b0\u01a1ng t\u1ef1 \u0111\u1ed1i v\u1edbi c\u00e1c tr\u01b0\u1eddng h\u1ee3p chia h\u1ebft kh\u00e1c)<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng: T\u1ed5ng k\u1ebft n\u0103m h\u1ecdc 2001- 2002 m\u1ed9t tr\u01b0\u1eddng ti\u1ec3u h\u1ecdc c\u00f3 462 h\u1ecdc sinh ti\u00ean ti\u1ebfn v\u00e0 195 h\u1ecdc sinh xu\u1ea5t s\u1eafc. Nh\u00e0 tr\u01b0\u1eddng d\u1ef1 \u0111\u1ecbnh th\u01b0\u1edfng cho h\u1ecdc sinh xu\u1ea5t s\u1eafc nhi\u1ec1u h\u01a1n h\u1ecdc sinh ti\u00ean ti\u1ebfn 2 quy\u1ec3n v\u1edf 1 em. C\u00f4 v\u0103n th\u01b0 t\u00ednh ph\u1ea3i mua 1996 quy\u1ec3n th\u00ec v\u1eeba \u0111\u1ee7 ph\u00e1t th\u01b0\u1edfng. H\u1ecfi c\u00f4 v\u0103n th\u01b0 t\u00ednh \u0111\u00fang hay sai? v\u00ec sao?<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Ta th\u1ea5y s\u1ed1 HS ti\u00ean ti\u1ebfn v\u00e0 s\u1ed1 HS xu\u1ea5t s\u1eafc \u0111\u1ec1u l\u00e0 nh\u1eefng s\u1ed1 chia h\u1ebft cho 3 v\u00ec v\u1eady s\u1ed1 v\u1edf th\u01b0\u1edfng cho m\u1ed7i lo\u1ea1i HS ph\u1ea3i l\u00e0 1 s\u1ed1 chia h\u1ebft cho 3. Suy ra t\u1ed5ng s\u1ed1 v\u1edf ph\u00e1t th\u01b0\u1edfng c\u0169ng l\u00e0 1 s\u1ed1 chia h\u1ebft cho 3, m\u00e0 1996 kh\u00f4ng chia h\u1ebft cho 3 &gt; V\u1eady c\u00f4 v\u0103n th\u01b0 \u0111\u00e3 t\u00ednh sai.<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Loai_4_Cac_bai_toan_ve_phep_chia_co_du\"><\/span>Lo\u1ea1i 4: C\u00e1c b\u00e0i to\u00e1n v\u1ec1 ph\u00e9p chia c\u00f3 d\u01b0<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">L\u00fd thuy\u1ebft c\u1ea7n nh\u1edb:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu a : 2 d\u01b0 1 th\u00ec ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a a l\u00e0 1, 3, 5, 7, 9<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu a : 5 d\u01b0 1 th\u00ec ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng c\u1ee7a a ph\u1ea3i l\u00e0 1 ho\u1eb7c 6 ; a : 5 d\u01b0 2 th\u00ec ch\u1ee9 s\u1ed1 t\u1eadn c\u00f9ng ph\u1ea3i l\u00e0 2 ho\u1eb7c 7 . . .<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu a v\u00e0 b c\u00f3 c\u00f9ng s\u1ed1 d\u01b0 khi chia cho 2 th\u00ec hi\u1ec7u c\u1ee7a ch\u00fang c\u0169ng chia h\u1ebft cho 2<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu a : b d\u01b0 b &#8211; 1 th\u00ec a + 1 chia h\u1ebft cho b<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu a : b d\u01b0 1 th\u00ec a &#8211; 1 chia h\u1ebft cho b<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng: Cho a = x459y. H\u00e3y thay x, y b\u1edfi nh\u1eefng ch\u1eef s\u1ed1 th\u00edch h\u1ee3p \u0111\u1ec3 khi chia a cho 2, 5, 9 \u0111\u1ec1u d\u01b0 1.<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Ta nh\u1eadn th\u1ea5y: a : 5 d\u01b0 1 n\u00ean y b\u1eb1ng 1 ho\u1eb7c 6<\/p>\n<p dir=\"ltr\">M\u1eb7t kh\u00e1c a : 2 d\u01b0 1 n\u00ean y ph\u1ea3i b\u1eb1ng 1. S\u1ed1 ph\u1ea3i t\u00ecm c\u00f3 d\u1ea1ng a= x4591<\/p>\n<p dir=\"ltr\">x4591 chia cho 9 d\u01b0 1 n\u00ean x + 4 + 5 + 9 + 1 chia cho 9 d\u01b0 1. v\u1eady x chia h\u1ebft cho 9 suy ra x = 0 ho\u1eb7c 9. M\u00e0 x l\u00e0 ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean c\u1ee7a 1 s\u1ed1 n\u00ean kh\u00f4ng th\u1ec3 b\u1eb1ng 0 v\u1eady x = 9<\/p>\n<p dir=\"ltr\">S\u1ed1 ph\u1ea3i t\u00ecm l\u00e0 : 94591<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Loai_5_Van_dung_tinh_chat_chia_het_va_chia_con_du_de_giai_cac_dang_toan_co_loi_van_o_tieu_hoc\"><\/span>Lo\u1ea1i 5: V\u1eadn d\u1ee5ng t\u00ednh ch\u1ea5t chia h\u1ebft v\u00e0 chia c\u00f2n d\u01b0 \u0111\u1ec3 gi\u1ea3i c\u00e1c d\u1ea1ng to\u00e1n c\u00f3 l\u1eddi v\u0103n \u1edf ti\u1ec3u h\u1ecdc<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng: T\u1ed5ng s\u1ed1 HS kh\u1ed1i 1 c\u1ee7a m\u1ed9t tr\u01b0\u1eddng ti\u1ec3u h\u1ecdc l\u00e0 1 s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng tr\u0103m l\u00e0 3. N\u1ebfu x\u1ebfp h\u00e0ng 10 v\u00e0 h\u00e0ng 12 \u0111\u1ec1u d\u01b0 8, m\u00e0 x\u1ebfp h\u00e0ng 8 th\u00ec kh\u00f4ng c\u00f2n d\u01b0. T\u00ednh s\u1ed1 HS kh\u1ed1i 1 c\u1ee7a tr\u01b0\u1eddng \u0111\u00f3.<\/p>\n<p dir=\"ltr\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n<p dir=\"ltr\">Theo \u0111\u1ec1 b\u00e0i th\u00ec s\u1ed1 HS kh\u1ed1i 1 \u0111\u00f3 c\u00f3 d\u1ea1ng 3ab. C\u00e1c em x\u1ebfp h\u00e0ng 10 d\u01b0 8 v\u1eady b = 8. Thay v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 3a8. M\u1eb7t kh\u00e1c, c\u00e1c em x\u1ebfp h\u00e0ng 12 d\u01b0 8 n\u00ean 3a8 &#8211; 8 = 3a0 ph\u1ea3i chia h\u1ebft cho 12 suy ra 3a0 chia h\u1ebft cho 3. suy ra a = 0, 3, 6 ho\u1eb7c 9. Ta c\u00f3 c\u00e1c s\u1ed1 330; 390 kh\u00f4ng chia h\u1ebft cho 12 v\u00ec v\u1eady s\u1ed1 HS kh\u1ed1i 1 l\u00e0 308 ho\u1eb7c 368 em. S\u1ed1 308 kh\u00f4ng chia h\u1ebft cho 8 v\u1eady s\u1ed1 HS kh\u1ed1i 1 c\u1ee7a tr\u01b0\u1eddng \u0111\u00f3 l\u00e0 368 em.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_5_Tinh_nhanh_bang_cac_tinh_chat_bat_bien_cua_phep_tinh\"><\/span>D\u1ea1ng 5: T\u00ednh nhanh b\u1eb1ng c\u00e1c t\u00ednh ch\u1ea5t b\u1ea5t bi\u1ebfn c\u1ee7a ph\u00e9p t\u00ednh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">L\u00fd thuy\u1ebft c\u1ea7n nh\u1edb:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00ednh ch\u1ea5t giao ho\u00e1n : a + b = b + a v\u00e0 a x b = b x a<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p: (a + b)+ c = a + (b + c) v\u00e0: (a x b) x c = a x (b x c)\u00a0<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Nh\u00e2n v\u1edbi 1 v\u00e0 chia cho 1: a x 1 = a ; a : a = 1 v\u00e0 a : 1 = a<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u1ed9ng v\u00e0 nh\u00e2n v\u1edbi 0: a + 0 = a v\u00e0 a x 0 = 0<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Nh\u00e2n 1 s\u1ed1 v\u1edbi 1 t\u1ed5ng v\u00e0 1 hi\u1ec7u:<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\" style=\"text-align: center\">a x (b + c) = a x b + a x c;<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">a x (b \u2013 c) = a x b \u2013 a x c<\/p>\n<p dir=\"ltr\" style=\"text-align: left\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"On_luyen_nhanh_mon_Toan_voi_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\"><\/span>\u00d4n luy\u1ec7n nhanh m\u00f4n To\u00e1n v\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Ngo\u00e0i c\u00e1c d\u1ea1ng to\u00e1n \u1edf ti\u1ec3u h\u1ecdc th\u01b0\u1eddng g\u1eb7p k\u1ec3 tr\u00ean th\u00ec c\u00f2n nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp to\u00e1n ti\u1ec3u h\u1ecdc n\u00e2ng cao kh\u00e1c. V\u00e0 \u0111\u1ec3 tr\u1ebb c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng ghi nh\u1edb v\u00e0 \u1ee9ng d\u1ee5ng c\u00e1c l\u00fd thuy\u1ebft to\u00e1n h\u1ecdc \u0111\u00f3 th\u00ec Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u00e3 ra \u0111\u1eddi. V\u1edbi \u0111\u1ed9i ng\u0169 ph\u00e1t tri\u1ec3n c\u00f3 nhi\u1ec1u n\u0103m kinh nghi\u1ec7m \u0111\u1ebfn t\u1eeb Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef, ph\u1ea7n m\u1ec1m n\u00e0y h\u1ee9a h\u1eb9n s\u1ebd l\u00e0 m\u1ed9t b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 trong gi\u00e1o d\u1ee5c hi\u1ec7n \u0111\u1ea1i.<\/p>\n<p dir=\"ltr\">\u1ee8ng d\u1ee5ng h\u1ecdc to\u00e1n b\u1eb1ng ti\u1ebfng Anh Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u00e3 t\u00edch h\u1ee3p c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gi\u00e1o d\u1ee5c hi\u1ec7n \u0111\u1ea1i, h\u1ed7 tr\u1ee3 tr\u1ebb ti\u1ebfp thu ki\u1ebfn th\u1ee9c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. Ngo\u00e0i ra c\u00f2n gi\u00fap t\u0103ng c\u01b0\u1eddng h\u1ee9ng th\u00fa h\u1ecdc cho tr\u1ebb th\u00f4ng qua c\u00e1c tr\u00f2 ch\u01a1i t\u01b0\u01a1ng t\u00e1c s\u1eb5n c\u00f3, v\u00e0 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt m\u1edbi h\u1eb1ng tu\u1ea7n.<\/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\/4-cac-dang-toan-o-tieu-hoc.jpg\" alt=\"Ph\u1ea7n m\u1ec1m h\u1ecdc to\u00e1n Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef Math. (\u1ea2nh: Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">B\u00ean c\u1ea1nh \u0111\u00f3, c\u00e1c b\u00e0i h\u1ecdc \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf m\u1ed9t c\u00e1ch b\u00e0i b\u1ea3ng theo \u0111\u00fang chu\u1ea9n theo ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c m\u1edbi c\u1ee7a B\u1ed9. T\u1eeb \u0111\u00f3, gi\u00fap tr\u1ebb d\u1ec5 d\u00e0ng ti\u1ebfp thu c\u00e1c ki\u1ebfn th\u1ee9c tr\u00ean l\u1edbp, t\u1ea1o ti\u1ec1n \u0111\u1ec1 cho b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 c\u1ee7a tr\u1ebb tr\u00ean c\u1ea3 h\u00e0nh tr\u00ecnh h\u1ecdc t\u1eadp sau n\u00e0y.\u00a0<\/p>\n<p dir=\"ltr\">C\u1ee5 th\u1ec3, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math s\u1ebd cung c\u1ea5p h\u01a1n 400 b\u00e0i h\u1ecdc th\u00f4ng qua video, h\u00ecnh \u1ea3nh ho\u1ea1t h\u1ecda ng\u1ed9 ngh\u0129nh d\u1ef1a tr\u00ean 60 ch\u1ee7 \u0111\u1ec1 to\u00e1n b\u00e1m s\u00e1t n\u1ed9i dung h\u1ecdc t\u1eeb m\u1ea7m non \u0111\u1ebfn ti\u1ec3u h\u1ecdc. \u0110\u1ec3 qua \u0111\u00f3 gi\u00fap tr\u1ebb ti\u1ebfp thu ki\u1ebfn th\u1ee9c m\u1ed9t c\u00e1ch h\u1ee9ng th\u00fa h\u01a1n, d\u1ec5 hi\u1ec3u h\u01a1n thay v\u00ec ch\u1ec9 d\u1ef1a v\u00e0o s\u00e1ch v\u1edf.<\/p>\n<p dir=\"ltr\">C\u00f9ng v\u1edbi \u0111\u00f3, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math x\u00e2y d\u1ef1ng v\u1edbi h\u01a1n 10.000 ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c h\u1ea5p d\u1eabn t\u1eeb ch\u01a1i tr\u00f2 ch\u01a1i, gi\u1ea3i c\u00e2u \u0111\u00f3, kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi to\u00e1n h\u1ecdc,&#8230; \u0110i\u1ec1u n\u00e0y g\u00f3p ph\u1ea7n gi\u00fap gia t\u0103ng s\u1ef1 h\u1ee9ng th\u00fa khi h\u1ecdc to\u00e1n, k\u00edch th\u00edch t\u01b0 duy to\u00e1n h\u1ecdc c\u1ee7a tr\u1ebb m\u1ed9t c\u00e1ch t\u1ed1t h\u01a1n r\u1ea5t nhi\u1ec1u. \u0110\u1ed3ng th\u1eddi, qua \u0111\u00f3 gi\u00fap tr\u1ebb 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\">B\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math qua video sau \u0111\u00e2y nh\u00e9:<\/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<p dir=\"ltr\" style=\"text-align: left\">T\u1ea3i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cho \u0111i\u1ec7n tho\u1ea1i Android<\/p>\n<p dir=\"ltr\" style=\"text-align: left\">T\u1ea3i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cho \u0111i\u1ec7n tho\u1ea1i iOS<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Mot_so_luu_y_khi_bo_me_day_be_hoc_cac_dang_toan_o_tieu_hoc\"><\/span>M\u1ed9t s\u1ed1 l\u01b0u \u00fd khi b\u1ed1 m\u1eb9 d\u1ea1y b\u00e9 h\u1ecdc c\u00e1c d\u1ea1ng to\u00e1n \u1edf ti\u1ec3u h\u1ecdc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00e1c d\u1ea1ng to\u00e1n c\u1ea5p 1 c\u0169ng kh\u00e1 nhi\u1ec1u, c\u0169ng nh\u01b0 l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng trong giai \u0111o\u1ea1n &#8220;v\u00e0ng&#8221; ph\u00e1t tri\u1ec3n c\u1ee7a tr\u1ebb. Ch\u00ednh v\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap con h\u1ecdc t\u1ed1t, b\u1ed1 m\u1eb9 c\u1ea7n l\u01b0u \u00fd m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 sau \u0111\u00e2y:<\/p>\n<ul>\n<li>Lu\u00f4n \u0111\u1ed3ng h\u00e0nh c\u00f9ng con: V\u00ec th\u1eddi l\u01b0\u1ee3ng h\u1ecdc tr\u00ean l\u1edbp kh\u00e1 \u00edt, n\u00ean b\u1ed1 m\u1eb9 c\u1ea7n d\u00e0nh th\u1eddi gian \u0111\u1ec3 \u0111\u1ed3ng h\u00e0nh h\u1ed7 tr\u1ee3 b\u00e9 h\u1ecdc th\u00eam t\u1ea1i nh\u00e0, gi\u00fap con luy\u1ec7n t\u1eadp ki\u1ebfn th\u1ee9c h\u1ecdc tr\u00ean tr\u01b0\u1eddng, c\u0169ng nh\u01b0 gi\u1ea3i \u0111\u00e1p ki\u1ebfn th\u1ee9c b\u00e9 c\u00f2n y\u1ebfu. Qua \u0111\u00f3 v\u1eeba gi\u00fap b\u00e9 h\u1ecdc t\u1eadp t\u1ed1t h\u01a1n m\u00e0 c\u00f2n g\u1eafn k\u1ebft t\u00ecnh c\u1ea3m gia \u0111\u00ecnh hi\u1ec7u qu\u1ea3.<\/li>\n<li>Gi\u00fap b\u00e9 n\u1eafm ch\u1eafc c\u00e1c d\u1ea1ng to\u00e1n ti\u1ec3u h\u1ecdc: V\u1edbi ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n c\u1ea5p 1 ki\u1ebfn th\u1ee9c ch\u1ec9 xoay quanh c\u00e1c ch\u1ee7 \u0111\u1ec1 nh\u01b0 s\u1ed1 \u0111\u1ebfm, ph\u00e9p t\u00ednh, so s\u00e1nh, h\u00ecnh h\u1ecdc,&#8230; N\u00ean b\u1ed1 m\u1eb9 h\u00e3y h\u1ed7 tr\u1ee3 b\u00e9 n\u1eafm ch\u1eafc t\u1eebng d\u1ea1ng to\u00e1n \u1edf m\u1ee9c c\u01a1 b\u1ea3n r\u1ed3i m\u1edbi d\u1ea7n h\u1ecdc n\u00e2ng cao l\u00ean.<\/li>\n<li>Th\u1ef1c h\u00e0nh, luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean: Thay v\u00ec ch\u1ec9 h\u1ecdc tr\u00ean s\u00e1ch v\u1edf, b\u1ed1 m\u1eb9 h\u00e3y t\u1ea1o \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 b\u00e9 \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean. Ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00f9ng con l\u00e0m b\u00e0i t\u1eadp tr\u00ean l\u1edbp, s\u01b0u t\u1ea7m th\u00eam nhi\u1ec1u b\u00e0i t\u1eadp tr\u00ean internet, gi\u1ea3i \u0111\u1ec1 thi, tham gia c\u00e1c cu\u1ed9c thi to\u00e1n ph\u00f9 h\u1ee3p v\u1edbi n\u0103ng l\u1ef1c, ch\u01a1i tr\u00f2 ch\u01a1i to\u00e1n h\u1ecdc li\u00ean quan,&#8230; Khi \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean b\u00e9 s\u1ebd c\u1ea3m th\u1ea5y h\u1ee9ng th\u00fa v\u00e0 ti\u1ebfp thu ki\u1ebfn th\u1ee9c t\u1ed1t h\u01a1n \u0111\u1ea5y.<\/li>\n<li>\u00c1p d\u1ee5ng nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc to\u00e1n: To\u00e1n ti\u1ec3u h\u1ecdc kh\u00f4ng kh\u00f3, nh\u01b0ng n\u1ebfu h\u1ecdc tr\u00ean s\u00e1ch v\u1edf b\u00e9 s\u1ebd nhanh ch\u00e1n v\u00e0 kh\u1ea3 n\u0103ng ti\u1ebfp thu gi\u1ea3m d\u1ea7n. Ch\u00ednh v\u00ec v\u1eady, b\u1ed1 m\u1eb9 n\u00ean \u00e1p d\u1ee5ng nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc kh\u00e1c nhau t\u1eeb tr\u00f2 ch\u01a1i, luy\u1ec7n t\u1eadp, gi\u1ea3i \u0111\u1ed1, h\u1ecdc to\u00e1n d\u1ef1a v\u00e0o th\u1ef1c ti\u1ec5n,&#8230; \u0110\u1ec3 k\u00edch th\u00edch t\u01b0 duy h\u1ecdc to\u00e1n c\u1ee7a tr\u1ebb ti\u1ec3u h\u1ecdc t\u1ed1t h\u01a1n.<\/li>\n<\/ul>\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 c\u00e1c d\u1ea1ng to\u00e1n \u1edf Ti\u1ec3u h\u1ecdc th\u01b0\u1eddng g\u1eb7p trong ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y m\u00e0 ba m\u1eb9 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng cho tr\u1ebb t\u1ef1 h\u1ecdc t\u1ea1i nh\u00e0. H\u00e3y theo d\u00f5i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef \u0111\u1ec3 \u0111\u00f3n xem c\u00e1c b\u00e0i vi\u1ebft chia s\u1ebb ki\u1ebfn th\u1ee9c nu\u00f4i d\u1ea1y tr\u1ebb h\u1eefu \u00edch s\u1eafp t\u1edbi nh\u00e9!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ec3 d\u1ec5 d\u00e0ng h\u01a1n cho c\u00e1c b\u1ea1n trong vi\u1ec7c n\u1eafm b\u1eaft v\u00e0 \u00f4n luy\u1ec7n c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 m\u00f4n to\u00e1n cho tr\u1ebb t\u1ea1i nh\u00e0. Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd t\u1ed5ng h\u1ee3p h\u1ea7u h\u1ebft c\u00e1c d\u1ea1ng to\u00e1n \u1edf Ti\u1ec3u h\u1ecdc th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch \u0111\u1ec3 gi\u1ea3i ch\u00fang ngay trong b\u00e0i vi\u1ebft n\u00e0y.\u00a0 C\u00e1c&#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-21813","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/21813","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=21813"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/21813\/revisions"}],"predecessor-version":[{"id":25378,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/21813\/revisions\/25378"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=21813"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=21813"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=21813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}