{"id":14981,"date":"2025-06-11T08:29:59","date_gmt":"2025-06-11T01:29:59","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=14981"},"modified":"2025-07-05T22:20:05","modified_gmt":"2025-07-05T15:20:05","slug":"toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/","title":{"rendered":"To\u00e1n l\u1edbp 4 \u0111\u1ec1 xi m\u00e9t vu\u00f4ng l\u00fd thuy\u1ebft v\u00e0 b\u00e0i t\u1eadp 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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Toan_toan_4_-meter_-square_-meter_la_gi\" >To\u00e1n to\u00e1n 4 -meter -square -meter l\u00e0 g\u00ec?<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Lam_the_nao_de_doc_va_lam_the_nao_de_viet_mot_don_vi_dexet_vuong\" >L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc v\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 vi\u1ebft m\u1ed9t \u0111\u01a1n v\u1ecb dexet vu\u00f4ng?<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Huong_dan_ve_cach_chuyen_doi_toan_hoc_lop_4_sang_cac_don_vi_khac\" >H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch chuy\u1ec3n \u0111\u1ed5i to\u00e1n h\u1ecdc l\u1edbp 4 sang c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Cac_loai_DM2_pho_bien_cua_toan_hoc_trong_toan_hoc_lop_4\" >C\u00e1c lo\u1ea1i DM2 ph\u1ed5 bi\u1ebfn c\u1ee7a to\u00e1n h\u1ecdc trong to\u00e1n h\u1ecdc l\u1edbp 4<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Mau_1_Doc_va_viet_so_bang_met_vuong\" >M\u1eabu 1: \u0110\u1ecdc v\u00e0 vi\u1ebft s\u1ed1 b\u1eb1ng m\u00e9t vu\u00f4ng<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Mau_2_Chuyen_doi_cac_don_vi_khac_thanh_DM%C2%B2_va_nguoc_lai\" >M\u1eabu 2: Chuy\u1ec3n \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c th\u00e0nh DM\u00b2 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Mau_3_So_sanh\" >M\u1eabu 3: So s\u00e1nh<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Mau_4_Tinh_toan\" >M\u1eabu 4: T\u00ednh to\u00e1n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Bi_quyet_hoc_tap_va_ghi_nho_kien_%E2%80%8B%E2%80%8Bthuc_toan_hoc_lop_4_tot_hon\" >B\u00ed quy\u1ebft h\u1ecdc t\u1eadp v\u00e0 ghi nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c to\u00e1n h\u1ecdc l\u1edbp 4 t\u1ed1t h\u01a1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Mot_so_trong_4_bai_tap_toan_hoc_cho_tre_em_de_thuc_hanh\" >M\u1ed9t s\u1ed1 trong 4 b\u00e0i t\u1eadp to\u00e1n h\u1ecdc cho tr\u1ebb em \u0111\u1ec3 th\u1ef1c h\u00e0nh<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Lop_4_Trang_63_Bai_1\" >L\u1edbp 4 Trang 63 B\u00e0i 1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Toan_lop_4_Trang_63_Bai_2\" >To\u00e1n l\u1edbp 4 Trang 63 B\u00e0i 2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Toan_hoc_lop_4_Trang_64_Bai_3\" >To\u00e1n h\u1ecdc l\u1edbp 4 Trang 64 B\u00e0i 3<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Toan_hoc_lop_4_Trang_64_Bai_4\" >To\u00e1n h\u1ecdc l\u1edbp 4 Trang 64 B\u00e0i 4<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Lop_4_Trang_64_Bai_5\" >L\u1edbp 4 Trang 64 B\u00e0i 5<\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Tap_the_duc_4_met_vuong_o_lop_4_duoc_mo_rong\" >T\u1eadp th\u1ec3 d\u1ee5c 4 m\u00e9t vu\u00f4ng \u1edf l\u1edbp 4 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng<\/a><\/li><\/ul><\/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\/toan-lop-4-de-xi-met-vuong-ly-thuyet-va-bai-tap-chi-tiet\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>To\u00e1n h\u1ecdc l\u1edbp 4 XI Square Meter l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 m\u00e0 em b\u00e9 s\u1ebd h\u1ecdc, l\u00e0m quen, gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp v\u00e0 quan tr\u1ecdng l\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf cao. V\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap h\u1ecd h\u1ecdc v\u00e0 chinh ph\u1ee5c ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc n\u00e0y, h\u00e3y \u0111\u1ec3 Kh\u1ec9 kh\u00e1m ph\u00e1 r\u00f5 r\u00e0ng h\u01a1n trong b\u00e0i vi\u1ebft sau.<\/p>\n<p>                        Xem t\u1ea5t c\u1ea3<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Toan_toan_4_-meter_-square_-meter_la_gi\"><\/span>To\u00e1n to\u00e1n 4 -meter -square -meter l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong to\u00e1n h\u1ecdc l\u1edbp 4, h\u1ecd s\u1ebd \u0111\u01b0\u1ee3c l\u00e0m quen v\u00e0 t\u00ecm hi\u1ec3u v\u1ec1 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 m\u00e9t vu\u00f4ng. \u0110\u01b0\u1ee3c bi\u1ebft, \u0111\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u01a1n v\u1ecb \u0111o khu v\u1ef1c chung, ch\u00fang \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch l\u1ea5y m\u1ed9t m\u00e9t chi\u1ec1u d\u00e0i nh\u00e2n v\u1edbi chi\u1ec1u r\u1ed9ng c\u1ee7a b\u1ea5t k\u1ef3 h\u00ecnh h\u1ecdc n\u00e0o.<\/p>\n<p dir=\"ltr\">Bi\u1ec3u t\u01b0\u1ee3ng: DM\u00b2<\/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\/toan-lop-4-de-xi-met-vuong-1.jpg\" alt=\"XI m\u00e9t vu\u00f4ng l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o khu v\u1ef1c ph\u1ed5 bi\u1ebfn. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_de_doc_va_lam_the_nao_de_viet_mot_don_vi_dexet_vuong\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc v\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 vi\u1ebft m\u1ed9t \u0111\u01a1n v\u1ecb dexet vu\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li dir=\"ltr\">C\u00e1ch \u0111\u1ecdc: Ch\u1ee7 \u0111\u1ec1 XI Square m\u00e9t<\/li>\n<li dir=\"ltr\">Ph\u01b0\u01a1ng th\u1ee9c vi\u1ebft: B\u1ea1n c\u00f3 th\u1ec3 vi\u1ebft theo bi\u1ec3u t\u01b0\u1ee3ng DM\u00b2 ho\u1eb7c c\u00e1ch b\u1ea1n \u0111\u1ecdc l\u00e0 &#8220;Square Decimet&#8221;, &#8220;Square -meter XI&#8221; t\u00f9y thu\u1ed9c v\u00e0o tr\u01b0\u1eddng h\u1ee3p.<\/li>\n<\/ul>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: 200 DM\u00b2: Hai tr\u0103m m\u00e9t vu\u00f4ng<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Huong_dan_ve_cach_chuyen_doi_toan_hoc_lop_4_sang_cac_don_vi_khac\"><\/span>H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch chuy\u1ec3n \u0111\u1ed5i to\u00e1n h\u1ecdc l\u1edbp 4 sang c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Theo c\u00e1c quy t\u1eafc chuy\u1ec3n \u0111\u1ed5i c\u1ee7a c\u00e1c \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf, ch\u00fang t\u00f4i c\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">Khi thay \u0111\u1ed5i \u0111\u01a1n v\u1ecb DM\u00b2 th\u00e0nh \u0111\u01a1n v\u1ecb nh\u1ecf h\u01a1n li\u1ec1n k\u1ec1, ch\u00fang t\u00f4i nh\u00e2n s\u1ed1 \u0111\u00f3 v\u1edbi 100<\/li>\n<li dir=\"ltr\">Khi thay \u0111\u1ed5i \u0111\u01a1n v\u1ecb \u0111o DM\u00b2 th\u00e0nh m\u1ed9t \u0111\u01a1n v\u1ecb l\u1edbn h\u01a1n, ch\u00fang t\u00f4i chia s\u1ed1 \u0111\u00f3 v\u1edbi 100<\/li>\n<\/ul>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: 1 DM2 = 100 cm2 = 10000 mm2 ho\u1eb7c 1 DM2 = 0,01 m2 = 0,0001 DAM2<\/em><\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3 th\u1ec3 theo d\u00f5i b\u1ea3ng sau:<\/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\/toan-lop-4-de-xi-met-vuong-2.jpg\" alt=\"B\u1ea3ng chuy\u1ec3n \u0111\u1ed5i \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng khu v\u1ef1c chung. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_loai_DM2_pho_bien_cua_toan_hoc_trong_toan_hoc_lop_4\"><\/span>C\u00e1c lo\u1ea1i DM2 ph\u1ed5 bi\u1ebfn c\u1ee7a to\u00e1n h\u1ecdc trong to\u00e1n h\u1ecdc l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc l\u1edbp 4 v\u1ec1 XI m\u00e9t vu\u00f4ng, c\u00e1c b\u00e0i t\u1eadp m\u00e0 tr\u1ebb em h\u1ecdc ch\u1ec9 l\u00e0 c\u01a1 b\u1ea3n \u0111\u1ec3 con c\u00e1i h\u1ecd hi\u1ec3u \u0111\u01a1n v\u1ecb n\u00e0y. Bao g\u1ed3m:<\/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\/toan-lop-4-de-xi-met-vuong-3.jpg\" alt=\"C\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng DM2. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Doc_va_viet_so_bang_met_vuong\"><\/span>M\u1eabu 1: \u0110\u1ecdc v\u00e0 vi\u1ebft s\u1ed1 b\u1eb1ng m\u00e9t vu\u00f4ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i ph\u00e1p: H\u1ecd ch\u1ec9 c\u1ea7n \u0111\u1ecdc v\u00e0 vi\u1ebft nh\u01b0 s\u1ed1 t\u1ef1 nhi\u00ean, sau \u0111\u00f3 th\u00eam m\u1ed9t c\u00e2u \u0111\u1ed1 m\u00e9t vu\u00f4ng \u1edf m\u1eb7t sau.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5:<\/em><\/p>\n<p dir=\"ltr\"><em>A) 751 DM2: B\u1ea3y tr\u0103m n\u0103m m\u01b0\u01a1i m\u00e9t vu\u00f4ng<\/em><\/p>\n<p dir=\"ltr\"><em>b) Hai tr\u0103m ba m\u01b0\u01a1i m\u00e9t vu\u00f4ng: 234 DM2<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Chuyen_doi_cac_don_vi_khac_thanh_DM%C2%B2_va_nguoc_lai\"><\/span>M\u1eabu 2: Chuy\u1ec3n \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c th\u00e0nh DM\u00b2 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: Ch\u00fang t\u00f4i \u00e1p d\u1ee5ng c\u00e1c quy t\u1eafc c\u1ee7a c\u00e1c \u0111\u01a1n v\u1ecb chuy\u1ec3n \u0111\u1ed5i \u0111\u1ec3 \u0111o di\u1ec7n t\u00edch theo h\u1ec7 th\u1ed1ng \u0111o SI \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp \u1edf tr\u00ean.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5:<\/em><\/p>\n<p dir=\"ltr\"><em>A) 7 DM2 = &#8230; CM2<\/em><\/p>\n<p dir=\"ltr\"><em>B) &#8230; CM2 = 2dm2 50cm2<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>A) 7 DM2 = 700cm2<\/em><\/p>\n<p dir=\"ltr\"><em>b) 250cm2 = 2dm2 50cm2<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_So_sanh\"><\/span>M\u1eabu 3: So s\u00e1nh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: Tr\u1ebb em so s\u00e1nh c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean, n\u1ebfu \u0111\u01a1n v\u1ecb \u0111o kh\u00f4ng gi\u1ed1ng v\u1edbi DM\u00b2, th\u00ec c\u1ea7n ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i sang c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi ti\u1ebfp t\u1ee5c so s\u00e1nh.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5:<\/em><\/p>\n<p dir=\"ltr\"><em>A) 210 (DM2) &#8230; 2 (DM2) 10 (CM2)<\/em><\/p>\n<p dir=\"ltr\"><em>b) 1954 (DM2) &#8230; 19 (DM2) 50 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>A) 10 (DM2) &#8230;. 2 (DM2) 10 (CM2)<\/em><\/p>\n<p dir=\"ltr\"><em>Ch\u00fang ta c\u00f3: 2 (DM2) 10 (CM2) = 210 cm2 <\/em><\/p>\n<p dir=\"ltr\"><em>V\u00ec v\u1eady, 210 (DM2) = 2 (DM2) 10 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>b) 1954 (DM2) &#8230; 19 (DM2) 50 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>Ch\u00fang ta c\u00f3: 19 (DM2) 50 (CM2) = 1950 DM2 <\/em><\/p>\n<p dir=\"ltr\"><em>V\u00ec v\u1eady, 1954 (DM2)&gt; 19 (DM2) 50 (cm2)<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_4_Tinh_toan\"><\/span>M\u1eabu 4: T\u00ednh to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u1ecd c\u1ea7n \u0111\u1ecdc k\u1ef9 v\u1ea5n \u0111\u1ec1 m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn, ph\u00e2n t\u00edch d\u1eef li\u1ec7u \u0111\u00e3 cho, \u0111\u00f2i h\u1ecfi v\u1ea5n \u0111\u1ec1 ph\u1ea3i \u0111\u01b0a ra c\u00e1c t\u00ednh to\u00e1n ch\u00ednh x\u00e1c. L\u01b0u \u00fd, n\u1ebfu d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u01b0a ra v\u00e0 y\u00eau c\u1ea7u kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u01a1n v\u1ecb \u0111o DM\u00b2 gi\u1ed1ng nhau, n\u00ean chuy\u1ec3n \u0111\u1ed5i ch\u00fang th\u00e0nh c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111\u1ec3 t\u00ednh to\u00e1n ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: cho ABCD vu\u00f4ng v\u1edbi AB = 7m. C\u00f3 bao nhi\u00eau khu v\u1ef1c ABCD vu\u00f4ng c\u00f3 chi\u1ec1u d\u00e0i vu\u00f4ng l\u00e0 h\u00ecnh vu\u00f4ng?<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>Thay \u0111\u1ed5i: 7m = 70dm<\/em><\/p>\n<p dir=\"ltr\"><em>ABCD khu v\u1ef1c vu\u00f4ng l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>70 \u00d7 70 = 4900 (DM2)<\/em><\/p>\n<p dir=\"ltr\"><em>Tr\u1ea3 l\u1eddi: 4900 DM2.<\/em><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_hoc_tap_va_ghi_nho_kien_%E2%80%8B%E2%80%8Bthuc_toan_hoc_lop_4_tot_hon\"><\/span>B\u00ed quy\u1ebft h\u1ecdc t\u1eadp v\u00e0 ghi nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c to\u00e1n h\u1ecdc l\u1edbp 4 t\u1ed1t h\u01a1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap b\u00e9 d\u1ec5 d\u00e0ng l\u00e0m quen, h\u00e3y chinh ph\u1ee5c c\u00e1c b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u1eddi khuy\u00ean 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\/toan-lop-4-de-xi-met-vuong-4.jpg\" alt=\"Nghi\u00ean c\u1ee9u to\u00e1n l\u1edbp 4 d\u1ef1a tr\u00ean s\u01a1 \u0111\u1ed3 t\u01b0 duy. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng l\u00fd thuy\u1ebft: \u0110\u1ec3 gi\u1ea3i quy\u1ebft b\u00e0i t\u1eadp, \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng l\u00e0 ph\u1ea3i n\u1eafm b\u1eaft l\u00fd thuy\u1ebft c\u1ee7a \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng DM\u00b2, t\u1eeb \u0111\u1ecdc, vi\u1ebft, chuy\u1ec3n \u0111\u1ed5i, b\u00e0i t\u1eadp v\u00e0 gi\u1ea3i ph\u00e1p. V\u00ec v\u1eady, cha m\u1eb9 c\u1ea7n ki\u1ec3m tra nh\u1eefng ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y v\u1ec1 con c\u00e1i h\u1ecd, n\u1ebfu ch\u00fang kh\u00f4ng hi\u1ec3u m\u1ed9t ch\u00fat c\u1ea7n ph\u1ea3i t\u0103ng c\u01b0\u1eddng k\u1ecbp th\u1eddi.<\/li>\n<li dir=\"ltr\">Nghi\u00ean c\u1ee9u song song v\u1edbi th\u1ef1c ti\u1ec5n: Khi b\u1ea1n hi\u1ec3u ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 DM\u00b2, ph\u1ee5 huynh th\u01b0\u1eddng khuy\u1ebfn kh\u00edch tr\u1ebb th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean h\u01a1n th\u00f4ng qua vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa, b\u00e0i t\u1eadp, h\u1ecdc th\u00eam ki\u1ebfn \u200b\u200bth\u1ee9c m\u1edbi tr\u00ean internet, th\u1ef1c h\u00e0nh th\u00f4ng qua th\u1ef1c h\u00e0nh &#8230;<\/li>\n<li dir=\"ltr\">H\u1ecdc theo s\u01a1 \u0111\u1ed3 t\u01b0 duy: Thay v\u00ec h\u1ecdc ki\u1ebfn \u200b\u200bth\u1ee9c tr\u00e0n lan, cha m\u1eb9 n\u00ean h\u01b0\u1edbng d\u1eabn tr\u1ebb h\u1ecdc theo s\u01a1 \u0111\u1ed3 suy ngh\u0129 v\u1edbi s\u1ef1 ph\u00e2n chia c\u1ee7a m\u1ed7i b\u00e0i h\u1ecdc, \u0111\u1ec3 ch\u00fang c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng h\u1ea5p th\u1ee5, ghi nh\u1edb v\u00e0 \u00e1p d\u1ee5ng t\u1ed1t h\u01a1n.<\/li>\n<li dir=\"ltr\">To\u00e1n h\u1ecdc l\u1edbp 4 th\u00fa v\u1ecb v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9: \u0110\u00e2y l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng to\u00e1n h\u1ecdc song ng\u1eef tr\u1ef1c tuy\u1ebfn cho tr\u1ebb m\u1eabu gi\u00e1o v\u00e0 tr\u1ebb em ti\u1ec3u h\u1ecdc. Nh\u1edd c\u00e1c \u1ee9ng d\u1ee5ng \u0111a s\u1ed1 l\u01b0\u1ee3ng t\u00edch c\u1ef1c, v\u1edbi nhi\u1ec1u b\u00e0i h\u1ecdc c\u00e1 nh\u00e2n h\u00f3a r\u00f5 r\u00e0ng, k\u1ebft h\u1ee3p v\u1edbi nhi\u1ec1u t\u00ednh n\u0103ng qu\u1ea3n l\u00fd, h\u1ed7 tr\u1ee3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng to\u00e1n h\u1ecdc v\u00e0 t\u01b0 duy c\u1ee7a tr\u1ebb em t\u1ed1t h\u01a1n. Ph\u1ee5 huynh c\u00f3 th\u1ec3 tham kh\u1ea3o To\u00e1n Kh\u1ec9 th\u00f4ng qua video sau ho\u1eb7c \u0111\u0103ng k\u00fd h\u1ed7 tr\u1ee3:<\/li>\n<\/ul>\n<p dir=\"ltr\"> <img loading=\"lazy\" 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\/dangkyngay.png\" alt=\"\" width=\"200\" height=\"40\"><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"> <a href=\"https:\/\/www.youtube.com\/watch?v=7DSJPVHFROS\" target=\"_blank\" rel=\"noopener\">https:\/\/www.youtube.com\/watch?v=7DSJPVHFROS<\/a><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_trong_4_bai_tap_toan_hoc_cho_tre_em_de_thuc_hanh\"><\/span>M\u1ed9t s\u1ed1 trong 4 b\u00e0i t\u1eadp to\u00e1n h\u1ecdc cho tr\u1ebb em \u0111\u1ec3 th\u1ef1c h\u00e0nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 to\u00e1n h\u1ecdc l\u1edbp 4 trong s\u00e1ch gi\u00e1o khoa trong s\u00e1ch gi\u00e1o khoa v\u00e0 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng, k\u00e8m theo gi\u1ea3i ph\u00e1p cho h\u1ecdc sinh tham kh\u1ea3o v\u00e0 th\u1ef1c h\u00e0nh:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Lop_4_Trang_63_Bai_1\"><\/span>L\u1edbp 4 Trang 63 B\u00e0i 1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ecdc: (H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i B\u00e0i t\u1eadp s\u1ed1 1 Trang 63\/SGK Math 4)<\/p>\n<p dir=\"ltr\">32 DM2<\/p>\n<p dir=\"ltr\">911 DM2<\/p>\n<p dir=\"ltr\">1952 DM2<\/p>\n<p dir=\"ltr\">492000 DM2<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: <\/p>\n<p dir=\"ltr\">32 (DM2) \u0110\u1ecdc l\u00e0: ba m\u01b0\u01a1i hai m\u00e9t vu\u00f4ng.<\/p>\n<p dir=\"ltr\">\u0110\u1ecdc 911 (DM2) l\u00e0: Ch\u00edn tr\u0103m m\u01b0\u1eddi m\u1ed9t m\u01b0\u1eddi m\u1ed9t.<\/p>\n<p dir=\"ltr\">1952 (DM2) \u0110\u1ecdc: M\u1ed9t ngh\u00ecn ch\u00edn tr\u0103m n\u0103m m\u01b0\u01a1i hai m\u00e9t vu\u00f4ng.<\/p>\n<p dir=\"ltr\">492000 (DM2) \u0110\u1ecdc: B\u1ed1n tr\u0103m ch\u00edn m\u01b0\u01a1i hai h\u00e0ng ng\u00e0n v\u1ea5n \u0111\u1ec1 d\u00e0i.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Toan_lop_4_Trang_63_Bai_2\"><\/span>To\u00e1n l\u1edbp 4 Trang 63 B\u00e0i 2<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Vi\u1ebft d\u01b0\u1edbi bi\u1ec3u m\u1eabu (H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i B\u00e0i t\u1eadp s\u1ed1 2 Trang 63\/SGK Math 4)<\/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\/toan-lop-4-de-xi-met-vuong-3a.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 \u0111\u1ecdc ph\u00e9p \u0111o c\u1ee7a khu v\u1ef1c, ch\u00fang t\u00f4i \u0111\u1ecdc s\u1ed1 tr\u01b0\u1edbc v\u00e0 sau \u0111\u00f3 \u0111\u1ecdc t\u00ean c\u1ee7a \u0111\u01a1n v\u1ecb \u0111o \u0111\u01a1n v\u1ecb.<\/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\/toan-lop-4-de-xi-met-vuong-3b.jpg\" alt=\"\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Toan_hoc_lop_4_Trang_64_Bai_3\"><\/span>To\u00e1n h\u1ecdc l\u1edbp 4 Trang 64 B\u00e0i 3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Vi\u1ebft s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m: (H\u01b0\u1edbng d\u1eabn gi\u1ea3i t\u1eadp s\u1ed1 3 Trang 64\/SGK Math 4)<\/p>\n<p dir=\"ltr\">1 DM2 = &#8230; CM2<\/p>\n<p dir=\"ltr\">48dm2 = &#8230;. CM2<\/p>\n<p dir=\"ltr\">1997dm2 = &#8230;. CM2<\/p>\n<p dir=\"ltr\">100cm2 = &#8230;. DM2<\/p>\n<p dir=\"ltr\">2000cm2 = &#8230; DM2<\/p>\n<p dir=\"ltr\">9900 cm2 = &#8230; DM2<\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">D\u1ef1a tr\u00ean chuy\u1ec3n \u0111\u1ed5i:<\/p>\n<p dir=\"ltr\">1dm2 = 100cm2.<\/p>\n<p dir=\"ltr\">1CM2 = 1\/100 DM2.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">1 (DM2) = 100 (cm2)<\/p>\n<p dir=\"ltr\">48 (DM2) = 4800 (cm2)<\/p>\n<p dir=\"ltr\">1997 (DM2) = 199700 (CM2)<\/p>\n<p dir=\"ltr\">100 (cm2) = 1 (DM2)<\/p>\n<p dir=\"ltr\">2000 (CM2) = 20 (DM2)<\/p>\n<p dir=\"ltr\">9900 (CM2) = 99 (DM2)<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Toan_hoc_lop_4_Trang_64_Bai_4\"><\/span>To\u00e1n h\u1ecdc l\u1edbp 4 Trang 64 B\u00e0i 4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110i\u1ec1n v\u00e0o con d\u1ea5u&gt;, &lt;, = Chuy\u1ec3n \u0111\u1ebfn d\u1ea5u ch\u1ea5m (H\u01b0\u1edbng d\u1eabn gi\u1ea3i t\u1eadp s\u1ed1 4 Trang 64\/SGK MATH 4)<\/p>\n<p dir=\"ltr\">210 (DM2) &#8230; 2 (DM2) 10 (CM2)<\/p>\n<p dir=\"ltr\">1954 (DM2) &#8230; 19 (DM2) 50 (CM2)<\/p>\n<p dir=\"ltr\">6 (DM2) 3 (CM2) &#8230; 603 (CM2)<\/p>\n<p dir=\"ltr\">2001 (CM2) &#8230; 20 (DM2) 10 (CM2)<\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">Thay \u0111\u1ed5i 2 c\u1ea1nh th\u00e0nh c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng v\u00e0 so s\u00e1nh k\u1ebft qu\u1ea3.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">210 (DM2) &#8230;. 2 (DM2) 10 (CM2)<\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3: 2 (DM2) 10 (CM2) = 210 cm2 SO 210 (DM2) = 2 (DM2) 10 (cm2)<\/p>\n<p dir=\"ltr\">1954 (DM2) &#8230;.. 19 (DM2) 50 (CM2)<\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3: 19 (DM2) 50 (CM2) = 1950 DM2 SO 1954 (DM2)&gt; 19 (DM2) 50 (CM2)<\/p>\n<p dir=\"ltr\">6 (DM2) 3 (CM2) &#8230;.. 603 (CM2)<\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3: 6 (DM2) 3 (CM2) = 603 cm2 SO 6 (DM2) 3 (CM2) = 603 (cm2)<\/p>\n<p dir=\"ltr\">2001 (CM2) &#8230;. 20 (DM2) 10 (CM2)<\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3: 20 (DM2) 10 (CM2) = 2010 CM2 SO 2001 (CM2) &lt;20 (DM2) 10 (CM2)<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Lop_4_Trang_64_Bai_5\"><\/span>L\u1edbp 4 Trang 64 B\u00e0i 5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ch\u00ednh x\u00e1c, sai s: (H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i B\u00e0i t\u1eadp s\u1ed1 5 Trang 64\/SGK Math 4)<\/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\/toan-lop-4-de-xi-met-vuong-5.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">\u00c1p d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c:<\/p>\n<p dir=\"ltr\">Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt = chi\u1ec1u d\u00e0i \u00d7 chi\u1ec1u r\u1ed9ng;<\/p>\n<p dir=\"ltr\">Di\u1ec7n t\u00edch vu\u00f4ng = c\u1ea1nh \u00d7 c\u1ea1nh.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">H\u1ecdc sinh c\u00f3 th\u1ec3 c\u1eaft gh\u00e9p h\u00ecnh \u0111\u1ec3 so s\u00e1nh tr\u1ef1c ti\u1ebfp ho\u1eb7c t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a t\u1eebng h\u00ecnh \u1ea3nh \u0111\u1ec3 so s\u00e1nh:<\/p>\n<p dir=\"ltr\">V\u00f9ng h\u00ecnh ch\u1eef nh\u1eadt l\u00e0: 20 x 5 = 100 cm\u00b2<\/p>\n<p dir=\"ltr\">V\u00f9ng vu\u00f4ng l\u00e0: 1 x 1 = 1 (dm\u00b2); 1 DM\u00b2 = 100 cm\u00b2.<\/p>\n<p dir=\"ltr\">Ch\u00fang t\u00f4i c\u00f3 k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c \u0111i\u1ec1n v\u00e0o ch\u1ed7 tr\u1ed1ng nh\u01b0 sau:<\/p>\n<p dir=\"ltr\">a) H\u00ecnh d\u1ea1ng h\u00ecnh vu\u00f4ng v\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 c\u00f9ng khu v\u1ef1c<\/p>\n<p dir=\"ltr\">b) di\u1ec7n t\u00edch vu\u00f4ng v\u00e0 di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng b\u1eb1ng s<\/p>\n<p dir=\"ltr\">c) h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n t\u00edch l\u1edbn h\u01a1n di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt s<\/p>\n<p dir=\"ltr\">D) H\u00ecnh d\u1ea1ng h\u00ecnh ch\u1eef nh\u1eadt nh\u1ecf h\u01a1n di\u1ec7n t\u00edch vu\u00f4ng s<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tap_the_duc_4_met_vuong_o_lop_4_duoc_mo_rong\"><\/span>T\u1eadp th\u1ec3 d\u1ee5c 4 m\u00e9t vu\u00f4ng \u1edf l\u1edbp 4 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i 1: Vi\u1ebft (theo m\u1eabu):<\/p>\n<p dir=\"ltr\">49dm2: Qu\u1ea3ng tr\u01b0\u1eddng b\u1ed1n m\u01b0\u01a1i ch\u00edn kh\u1ed1i<\/p>\n<p dir=\"ltr\">119dm2: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">1969dm2: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">32 000DM2: \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">B\u00e0i 2: Vi\u1ebft (theo m\u1eabu):<\/p>\n<p dir=\"ltr\">M\u1ed9t tr\u0103m linh ti\u00eau \u0111\u1ec1 hai t\u1ea7ng: 102dm2<\/p>\n<p dir=\"ltr\">Hai ngh\u00ecn kh\u00f4ng c\u00f3 h\u00e0ng tr\u0103m n\u0103m vu\u00f4ng \u0111\u1ec3 xem:<\/p>\n<p dir=\"ltr\">M\u1ed9t ngh\u00ecn ch\u00edn tr\u0103m n\u0103m m\u01b0\u01a1i b\u1ed1n \u0111\u1ea7u vu\u00f4ng:<\/p>\n<p dir=\"ltr\">Ch\u00edn tr\u0103m ch\u00edn m\u01b0\u01a1i vu\u00f4ng vu\u00f4ng: \u2026\u2026\u2026\u2026<\/p>\n<p dir=\"ltr\">B\u00e0i 3: Vi\u1ebft s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m:<\/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\/toan-lop-4-de-xi-met-vuong-6.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">B\u00e0i 4: Nh\u1eadp d\u1ea5u th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m (&gt;, &lt;, =):<\/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\/toan-lop-4-de-xi-met-vuong-7.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">B\u00e0i 5: Gi\u1ea5y \u0111\u1ecf c\u00f3 chi\u1ec1u d\u00e0i 9cm, chi\u1ec1u r\u1ed9ng 5cm. Gi\u1ea5y h\u00ecnh vu\u00f4ng m\u00e0u xanh c\u00f3 chu vi b\u1eb1ng chu vi c\u1ee7a gi\u1ea5y \u0111\u1ecf. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a gi\u1ea5y m\u00e0u xanh.<\/p>\n<p dir=\"ltr\">B\u00e0i 6: \u0110\u1ec3 m\u1edf m\u1ed9t c\u0103n ph\u00f2ng, m\u1ecdi ng\u01b0\u1eddi s\u1eed d\u1ee5ng 400 vi\u00ean g\u1ea1ch vu\u00f4ng v\u1edbi 30cm, bi\u1ebft di\u1ec7n t\u00edch c\u1ee7a m\u1ea1ch v\u1eefa l\u00e0 kh\u00f4ng \u0111\u00e1ng k\u1ec3.<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, c\u00f3 bao nhi\u00eau dm2 l\u00e0 khu v\u1ef1c ph\u00f2ng<\/p>\n<p dir=\"ltr\">B\u00e0i 7: M\u1ed9t ao h\u00ecnh ch\u1eef nh\u1eadt g\u1ea5p \u0111\u00f4i chi\u1ec1u d\u00e0i c\u1ee7a chi\u1ec1u r\u1ed9ng, t\u1ed5ng chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng 120m. H\u1ecfi khu v\u1ef1c c\u1ee7a ao h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 r\u1ea5t nhi\u1ec1u v\u1ea5n \u0111\u1ec1 vu\u00f4ng?<\/p>\n<p dir=\"ltr\">B\u00e0i 8: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi 1m, n\u1ebfu chi\u1ec1u d\u00e0i c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 15cm v\u00e0 chi\u1ec1u r\u1ed9ng 5cm, ch\u00fang ta s\u1ebd c\u00f3 m\u1ed9t h\u00ecnh vu\u00f4ng m\u1edbi. V\u00f9ng vu\u00f4ng m\u1edbi l\u00e0 bao nhi\u00eau h\u00ecnh vu\u00f4ng?<\/p>\n<p dir=\"ltr\">B\u00e0i 9: Gi\u1ea5y \u0111\u1ecf c\u00f3 chi\u1ec1u d\u00e0i 9dm, chi\u1ec1u r\u1ed9ng 5 dm. Gi\u1ea5y h\u00ecnh vu\u00f4ng m\u00e0u xanh c\u00f3 chu vi b\u1eb1ng chu vi c\u1ee7a gi\u1ea5y \u0111\u1ecf. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a gi\u1ea5y m\u00e0u xanh.<\/p>\n<p dir=\"ltr\">B\u00e0i 10: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 40dm, chi\u1ec1u r\u1ed9ng 20dm. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt \u0111\u00f3.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ket_luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/p>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 vi\u1ec7c chia s\u1ebb ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 to\u00e1n h\u1ecdc l\u1edbp 4 t\u00ednh b\u1eb1ng m\u00e9t vu\u00f4ng. Do \u0111\u00f3, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng \u0111\u00e2y l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc quan tr\u1ecdng kh\u00f4ng ch\u1ec9 trong to\u00e1n h\u1ecdc m\u00e0 c\u00f2n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf. V\u00ec v\u1eady, cha m\u1eb9 vui l\u00f2ng tham kh\u1ea3o trang b\u1ecb cho tr\u1ebb em nh\u1eefng b\u00e0i h\u1ecdc v\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c quan tr\u1ecdng n\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To\u00e1n h\u1ecdc l\u1edbp 4 XI Square Meter l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 m\u00e0 em b\u00e9 s\u1ebd h\u1ecdc, l\u00e0m quen, gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp v\u00e0 quan tr\u1ecdng l\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf cao. V\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap h\u1ecd h\u1ecdc v\u00e0 chinh ph\u1ee5c ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc n\u00e0y, h\u00e3y \u0111\u1ec3 Kh\u1ec9 kh\u00e1m ph\u00e1 r\u00f5 r\u00e0ng h\u01a1n trong&#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-14981","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14981","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=14981"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14981\/revisions"}],"predecessor-version":[{"id":17998,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14981\/revisions\/17998"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=14981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=14981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=14981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}