{"id":17147,"date":"2025-07-04T15:35:05","date_gmt":"2025-07-04T08:35:05","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=17147"},"modified":"2025-07-04T15:35:05","modified_gmt":"2025-07-04T08:35:05","slug":"tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/","title":{"rendered":"T\u1ed5ng h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 ki\u1ebfn th\u1ee9c t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n trong to\u00e1n h\u1ecdc"},"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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Su_ket_hop_cua_phep_nhan_la_gi\" >S\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n 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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Cac_dinh_dang_toan_hoc_ket_hop_phep_nhan_chung\" >C\u00e1c \u0111\u1ecbnh d\u1ea1ng to\u00e1n h\u1ecdc k\u1ebft h\u1ee3p ph\u00e9p nh\u00e2n chung<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Mau_1_Cong_thuc_dinh_nghia\" >M\u1eabu 1: C\u00f4ng th\u1ee9c \u0111\u1ecbnh ngh\u0129a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Mau_2_So_sanh_cac_bieu_thuc\" >M\u1eabu 2: So s\u00e1nh c\u00e1c bi\u1ec3u th\u1ee9c<\/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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Mau_3_Thuc_hien_tinh_toan\" >M\u1eabu 3: Th\u1ef1c hi\u1ec7n 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-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Bi_quyet_hoc_tap_va_ghi_nho_hieu_qua_cua_viec_ket_hop_hieu_qua\" >B\u00ed quy\u1ebft h\u1ecdc t\u1eadp v\u00e0 ghi nh\u1edb hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c k\u1ebft h\u1ee3p 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-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Xay_dung_nen_tang_va_su_quan_tam_den_viec_hoc_toan_cho_tre_em_voi_toan_hoc\" >X\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng v\u00e0 s\u1ef1 quan t\u00e2m \u0111\u1ebfn vi\u1ec7c h\u1ecdc to\u00e1n cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc<\/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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Giup_tre_lam_chu_ly_thuyet_ve_cac_thuoc_tinh_ket_hop_trong_phep_nhan\" >Gi\u00fap tr\u1ebb l\u00e0m ch\u1ee7 l\u00fd thuy\u1ebft v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p trong ph\u00e9p nh\u00e2n<\/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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Hay_chac_chan_rang_em_be_cua_ban_da_nam_bat_duoc_kien_%E2%80%8B%E2%80%8Bthuc_ve_bang_chin_chuong\" >H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng em b\u00e9 c\u1ee7a b\u1ea1n \u0111\u00e3 n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 b\u1ea3ng ch\u00edn ch\u01b0\u01a1ng<\/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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Thuc_hanh_voi_em_be_cua_ban_thuc_hanh_thuong_xuyen\" >Th\u1ef1c h\u00e0nh v\u1edbi em b\u00e9 c\u1ee7a b\u1ea1n, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Mot_so_bai_tap_ve_viec_ket_hop_phep_nhan_lop_4_cho_tre_thuc_hanh\" >M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 vi\u1ec7c k\u1ebft h\u1ee3p ph\u00e9p nh\u00e2n l\u1edbp 4 cho tr\u1ebb th\u1ef1c h\u00e0nh<\/a><\/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\/tong-hop-day-du-kien-thuc-tinh-chat-ket-hop-cua-phep-nhan-trong-toan-hoc\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>S\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n l\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n c\u1ee7a to\u00e1n h\u1ecdc c\u1ea5p 4 m\u00e0 h\u1ecd s\u1ebd h\u1ecdc. \u0110\u00e2y \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t b\u1ea3n ch\u1ea5t quan tr\u1ecdng c\u1ee7a ph\u00e9p nh\u00e2n, d\u1ef1a tr\u00ean \u0111\u00f3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc v\u00e0 gi\u1ea3i ph\u00e1p ch\u00ednh x\u00e1c. V\u00ec v\u1eady, \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n, h\u00e3y \u0111\u1ec3 kh\u1ec9 kh\u00e1m ph\u00e1 chi ti\u1ebft trong b\u00e0i vi\u1ebft sau.<\/p>\n<p>                                                                    <\/p>\n<p class=\"title\">H\u00e0ng tri\u1ec7u tr\u1ebb em \u0111\u00e3 ph\u00e1t tri\u1ec3n c\u00e1c k\u1ef9 n\u0103ng ng\u00f4n ng\u1eef c\u1ee7a ch\u00fang th\u00f4ng qua c\u00e1c \u1ee9ng d\u1ee5ng h\u1ecdc t\u1eadp c\u1ee7a kh\u1ec9<\/p>\n<p class=\"description\">\u0110\u0103ng k\u00fd ngay \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed v\u1ec1 c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 tuy\u1ebfn h\u1ecdc h\u1ecdc cho tr\u1ebb em.<\/p>\n<p>                                                                            *Vui l\u00f2ng ki\u1ec3m tra t\u00ean \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a b\u1ea1n *Vui l\u00f2ng ki\u1ec3m tra s\u1ed1 \u0111i\u1ec7n tho\u1ea1i h\u01a1n 2.000 t\u1eeb &amp; 6.000 c\u00e2u ti\u1ebfng Anh \u0111\u1ec3 ph\u00e1t tri\u1ec3n to\u00e0n di\u1ec7n 4 k\u1ef9 n\u0103ng ti\u1ebfng Anh t\u1ed1t &#8211; ti\u1ebfng Anh theo c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7n \u0111\u1ea1i ph\u00e1t tri\u1ec3n kh\u1ea3 n\u0103ng EQ &amp; Vi\u1ec7t Nam *B\u1ea1n ch\u01b0a ch\u1ecdn b\u1ea5t k\u1ef3 m\u1ee5c n\u00e0o! \u0110\u0103ng k\u00fd t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Su_ket_hop_cua_phep_nhan_la_gi\"><\/span>S\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 hi\u1ec3u s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n l\u00e0 g\u00ec, h\u00e3y th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n v\u00e0 so s\u00e1nh k\u1ebft qu\u1ea3 c\u1ee7a hai bi\u1ec3u th\u1ee9c sau:<\/p>\n<p dir=\"ltr\"><em>(5 x 3) x 2 v\u00e0 5 x (3 x 2)<\/em><\/p>\n<p dir=\"ltr\"><em>Ch\u00fang ta c\u00f3: (5 x 3) x 2 = 15 x 2 = 30<\/em><\/p>\n<p dir=\"ltr\"><em>5 x (2 x 3) = 5 x 6 = 30<\/em><\/p>\n<p dir=\"ltr\"><em>==&gt; (5 x 3) x 2 = 5 x (3 x 2)<\/em><\/p>\n<p dir=\"ltr\">T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, ch\u00fang ta th\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a t\u00ednh to\u00e1n AXBXC khi vi\u1ebft th\u00e0nh 2 bi\u1ec3u th\u1ee9c (AXB) XC v\u00e0 AX (BXC) lu\u00f4n b\u1eb1ng nhau. Ch\u00fang t\u00f4i vi\u1ebft: (AXB) XC = AX (BXC).<\/p>\n<p dir=\"ltr\">\u0110\u1ecbnh ngh\u0129a: <em>Khi nh\u00e2n v\u1edbi 3 y\u1ebfu t\u1ed1, trong \u0111\u00f3 y\u1ebfu t\u1ed1 th\u1ee9 ba, ch\u00fang ta c\u00f3 th\u1ec3 nh\u00e2n v\u1edbi y\u1ebfu t\u1ed1 \u0111\u1ea7u ti\u00ean v\u1edbi s\u1ea3n ph\u1ea9m c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 th\u1ee9 ba.<\/em><\/p>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c nh\u01b0 sau: AXBXC = (AXB) XC = AX (BXC)<\/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\/tinh-chat-ket-hop-cua-phep-nhan-1.jpg\" alt=\"V\u00ed d\u1ee5 v\u1ec1 s\u1ef1 k\u1ebft h\u1ee3p trong ph\u00e9p nh\u00e2n. (\u1ea2nh: Loigiaihay.com)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dinh_dang_toan_hoc_ket_hop_phep_nhan_chung\"><\/span>C\u00e1c \u0111\u1ecbnh d\u1ea1ng to\u00e1n h\u1ecdc k\u1ebft h\u1ee3p ph\u00e9p nh\u00e2n chung<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong ch\u01b0\u01a1ng tr\u00ecnh ti\u1ec3u h\u1ecdc, tr\u1ebb em s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 t\u00e0i s\u1ea3n n\u00e0y. C\u1ee5 th\u1ec3, tr\u1ebb em s\u1ebd quen thu\u1ed9c v\u1edbi c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp c\u01a1 b\u1ea3n 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\/tinh-chat-ket-hop-cua-phep-nhan-2.jpg\" alt=\"C\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn ph\u00e9p nh\u00e2n \u00e1p d\u1ee5ng k\u1ebft h\u1ee3p. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Cong_thuc_dinh_nghia\"><\/span>M\u1eabu 1: C\u00f4ng th\u1ee9c \u0111\u1ecbnh ngh\u0129a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u1ecd s\u1ebd nh\u1edb \u0111\u1ecbnh ngh\u0129a v\u1ec1 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ec3 tr\u1ea3 l\u1eddi ch\u00ednh x\u00e1c c\u00e1c c\u00e2u h\u1ecfi l\u00fd thuy\u1ebft ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: \u0110i\u1ec1u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang?<\/em><\/p>\n<p dir=\"ltr\"><em>A. Khi nh\u00e2n \u00e2m l\u01b0\u1ee3ng hai ch\u1eef s\u1ed1 v\u1edbi s\u1ed1 th\u1ee9 ba, ch\u00fang ta c\u00f3 th\u1ec3 nh\u00e2n s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi s\u1ea3n ph\u1ea9m c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 th\u1ee9 ba.<\/em><\/p>\n<p dir=\"ltr\"><em>B. Khi nh\u00e2n \u00e2m l\u01b0\u1ee3ng hai ch\u1eef s\u1ed1 v\u1edbi s\u1ed1 th\u1ee9 ba, ch\u00fang ta kh\u00f4ng th\u1ec3 nh\u00e2n s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi s\u1ea3n ph\u1ea9m c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 th\u1ee9 ba.<\/em><\/p>\n<p dir=\"ltr\"><em>C. Khi nh\u00e2n s\u1ed1 hai s\u1ed1 v\u1edbi s\u1ed1 th\u1ee9 ba, ch\u00fang ta c\u00f3 th\u1ec3 nh\u00e2n s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi ch\u1ea5n th\u01b0\u01a1ng c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 th\u1ee9 ba.<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>D\u1ef1a tr\u00ean l\u00fd thuy\u1ebft \u0111\u1ecbnh ngh\u0129a v\u1ec1 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n, ch\u00fang ta c\u00f3 &#8220;khi nh\u00e2n kh\u1ed1i l\u01b0\u1ee3ng hai -sy -sigit v\u1edbi s\u1ed1 th\u1ee9 ba, ch\u00fang ta c\u00f3 th\u1ec3 nh\u00e2n s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi s\u1ea3n ph\u1ea9m c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 th\u1ee9 ba.&#8221; N\u00ean tr\u1ea3 l\u1eddi A l\u00e0 ch\u00ednh x\u00e1c nh\u1ea5t.<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_So_sanh_cac_bieu_thuc\"><\/span>M\u1eabu 2: So s\u00e1nh c\u00e1c bi\u1ec3u th\u1ee9c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: Ch\u00fang t\u00f4i s\u1ebd \u00e1p d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p \u0111\u1ec3 t\u00ednh to\u00e1n t\u1eebng bi\u1ec3u th\u1ee9c tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh so s\u00e1nh ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: So s\u00e1nh c\u00e1c bi\u1ec3u th\u1ee9c sau:<\/em><\/p>\n<p dir=\"ltr\"><em>a) 10 x 7 x 5 &#8230; 22 x 5 x 2<\/em><\/p>\n<p dir=\"ltr\"><em>b) 55 x 2 x 14 &#8230; 19 x 5 x 20<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>a) Ch\u00fang t\u00f4i c\u00f3,<\/em><\/p>\n<p dir=\"ltr\"><em>10 x (7 x 5) = 10 x 35 = 350<\/em><\/p>\n<p dir=\"ltr\"><em>22 x (5 x 2) = 22 x 10 = 220<\/em><\/p>\n<p dir=\"ltr\"><em>==&gt; 10 x 7 x 5&gt; 22 x 5 x 2<\/em><\/p>\n<p dir=\"ltr\"><em>b) Ch\u00fang t\u00f4i c\u00f3,<\/em><\/p>\n<p dir=\"ltr\"><em>(55 x 2) x 14 = 110 x 14 = 1540<\/em><\/p>\n<p dir=\"ltr\"><em>19 x (5 x 20) = 19 x 100 = 1900<\/em><\/p>\n<p dir=\"ltr\"><em>==&gt; 55 x 2 x 14 &lt;19 x 5 x 20<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_Thuc_hien_tinh_toan\"><\/span>M\u1eabu 3: Th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: Ch\u00fang t\u00f4i s\u1ebd d\u1ef1a v\u00e0o s\u1ef1 k\u1ebft h\u1ee3p \u0111\u1ec3 thu th\u1eadp c\u00e1c m\u1eb7t d\u1ec5 d\u00e0ng nh\u1ea5t v\u00e0 ti\u1ebfp t\u1ee5c nh\u00e2n v\u1edbi ph\u1ea7n c\u00f2n l\u1ea1i \u0111\u1ec3 t\u00ednh to\u00e1n nhanh h\u01a1n.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh 2 x 4 x 5 =?<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u01b0\u01a1ng ph\u00e1p 1: 2 x 4 x 5 = (2 x 4) x 5 = 8 x 5 = 40<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u01b0\u01a1ng ph\u00e1p 2: 2 x 4 x 5 = 2 x (4 x 5) = 2 x 20 = 40<\/em><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_hoc_tap_va_ghi_nho_hieu_qua_cua_viec_ket_hop_hieu_qua\"><\/span>B\u00ed quy\u1ebft h\u1ecdc t\u1eadp v\u00e0 ghi nh\u1edb hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c k\u1ebft h\u1ee3p hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Ki\u1ebfn th\u1ee9c v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p trong t\u00ednh to\u00e1n c\u1ee7a con ng\u01b0\u1eddi l\u00e0 kh\u00f4ng th\u1ef1c s\u1ef1 kh\u00f3 hi\u1ec3u, nh\u01b0ng \u0111\u00f3 l\u00e0 ti\u1ec1n \u0111\u1ec1 cho tr\u1ebb h\u1ecdc v\u00e0 c\u00f3 \u0111\u01b0\u1ee3c ki\u1ebfn \u200b\u200bth\u1ee9c cao h\u01a1n v\u1ec1 ph\u00e9p nh\u00e2n ho\u1eb7c c\u00e1c h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc kh\u00e1c. V\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc t\u1ed1t to\u00e1n n\u00e0y, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00ed m\u1eadt m\u00e0 cha m\u1eb9 c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 em b\u00e9 ::<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Xay_dung_nen_tang_va_su_quan_tam_den_viec_hoc_toan_cho_tre_em_voi_toan_hoc\"><\/span>X\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng v\u00e0 s\u1ef1 quan t\u00e2m \u0111\u1ebfn vi\u1ec7c h\u1ecdc to\u00e1n cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u1ee9ng d\u1ee5ng to\u00e1n h\u1ecdc t\u01b0 duy ti\u1ebfng Anh tr\u1ef1c tuy\u1ebfn \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef, cho \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a tr\u01b0\u1eddng m\u1ea7m non v\u00e0 tr\u01b0\u1eddng ti\u1ec3u h\u1ecdc. C\u1ee5 th\u1ec3, \u1ee9ng d\u1ee5ng n\u00e0y \u0111\u01b0\u1ee3c sinh ra \u0111\u1ec3 gi\u00fap kh\u1eafc ph\u1ee5c nh\u1eefng kh\u00f3 kh\u0103n c\u1ee7a nhi\u1ec1u ph\u1ee5 huynh kh\u00f4ng c\u00f3 nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 d\u1ea1y to\u00e1n cho tr\u1ebb em, gia \u0111\u00ecnh kh\u00f4ng c\u00f3 \u0111i\u1ec1u ki\u1ec7n cho tr\u1ebb t\u00ecm hi\u1ec3u th\u00eam t\u1ea1i c\u00e1c trung t\u00e2m, c\u0169ng nh\u01b0 mong mu\u1ed1n gi\u00fap tr\u1ebb ph\u00e1t tri\u1ec3n n\u0103ng l\u1ef1c to\u00e1n h\u1ecdc v\u00e0 suy ngh\u0129 v\u01b0\u1ee3t tr\u1ed9i 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\/tinh-chat-ket-hop-cua-phep-nhan-3.jpg\" alt=\"T\u1ea1o m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u1eefng ch\u1eafc cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9. (\u1ea2nh; Kh\u1ec9)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">V\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math, em b\u00e9 c\u1ee7a b\u1ea1n s\u1ebd h\u1ecdc t\u1ea5t c\u1ea3 ki\u1ebfn \u200b\u200bth\u1ee9c t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao, \u0111\u01b0\u1ee3c chia th\u00e0nh 4 c\u1ea5p \u0111\u1ed9 t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed7i \u0111\u1ed9 tu\u1ed5i v\u00e0 l\u1edbp h\u1ecdc. Do \u0111\u00f3 gi\u00fap cha m\u1eb9 d\u1ec5 d\u00e0ng ch\u1ecdn b\u00e0i h\u1ecdc ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed7i \u0111\u1ee9a tr\u1ebb.<\/p>\n<p dir=\"ltr\">\u0110\u1ed3ng th\u1eddi, n\u1ed9i dung b\u00e0i h\u1ecdc t\u1ea1i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u00e3 theo ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c m\u1edbi nh\u1ea5t c\u1ee7a B\u1ed9 Gi\u00e1o d\u1ee5c v\u00e0 \u0110\u00e0o t\u1ea1o, v\u1edbi h\u01a1n 400 b\u00e0i h\u1ecdc \u0111\u01b0\u1ee3c d\u1ea1y qua video, ho\u1ea1t h\u00ecnh h\u00e0i h\u01b0\u1edbc cho tr\u1ebb em d\u1ec5 d\u00e0ng n\u1eafm b\u1eaft ki\u1ebfn \u200b\u200bth\u1ee9c, d\u1ec5 d\u00e0ng ti\u1ebfp thu v\u00e0 ghi nh\u1edb t\u1ed1t h\u01a1n.<\/p>\n<p dir=\"ltr\">K\u00e8m theo \u0111\u00f3, \u1ee9ng d\u1ee5ng c\u0169ng ph\u00e1t tri\u1ec3n h\u01a1n 10.000 ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c nh\u01b0 tr\u00f2 ch\u01a1i, c\u00e2u \u0111\u1ed1, c\u00e2u \u0111\u1ed1, t\u00ecm ki\u1ebfm kho b\u00e1u to\u00e1n h\u1ecdc &#8230; \u0111i\u1ec1u n\u00e0y g\u00f3p ph\u1ea7n gi\u00fap tr\u1ebb ch\u01a1i v\u00e0 h\u1ecdc h\u1ecfi nh\u01b0ng c\u0169ng nh\u01b0 k\u00edch th\u00edch s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a t\u01b0 duy v\u00e0 tr\u00ed th\u00f4ng minh trong giai \u0111o\u1ea1n ho\u00e0ng kim c\u1ee7a s\u1ef1 ph\u00e1t tri\u1ec3n n\u00e3o.<\/p>\n<p dir=\"ltr\">H\u1ee9a h\u1eb9n, m\u1ed7i kho\u1ea3nh kh\u1eafc \u0111\u1ec3 h\u1ecdc to\u00e1n v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9 s\u1ebd l\u00e0 ni\u1ec1m vui cho tr\u1ebb em m\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c kh\u00f3 c\u00f3 th\u1ec3 mang l\u1ea1i. Ph\u1ee5 huynh c\u00f3 th\u1ec3 t\u1ea3i xu\u1ed1ng \u1ee9ng d\u1ee5ng mi\u1ec5n ph\u00ed ngay t\u1ea1i iOS ho\u1eb7c Android.<\/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<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giup_tre_lam_chu_ly_thuyet_ve_cac_thuoc_tinh_ket_hop_trong_phep_nhan\"><\/span>Gi\u00fap tr\u1ebb l\u00e0m ch\u1ee7 l\u00fd thuy\u1ebft v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p trong ph\u00e9p nh\u00e2n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 tr\u1ebb gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp nh\u00e2n ch\u00ednh x\u00e1c, cha m\u1eb9 c\u1ea7n h\u1ed7 tr\u1ee3, gi\u1ea3i th\u00edch, h\u01b0\u1edbng d\u1eabn t\u1eadp th\u1ec3 d\u1ee5c chi ti\u1ebft t\u1eebng b\u01b0\u1edbc, \u00e1p d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p. Do \u0111\u00f3, em b\u00e9 c\u1ee7a b\u1ea1n s\u1ebd d\u1ec5 d\u00e0ng hi\u1ec3u ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y v\u00e0 \u00e1p d\u1ee5ng khi l\u00e0m b\u00e0i t\u1eadp v\u1ec1 nh\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n thay v\u00ec ch\u1ec9 n\u00f3i.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Hay_chac_chan_rang_em_be_cua_ban_da_nam_bat_duoc_kien_%E2%80%8B%E2%80%8Bthuc_ve_bang_chin_chuong\"><\/span>H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng em b\u00e9 c\u1ee7a b\u1ea1n \u0111\u00e3 n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 b\u1ea3ng ch\u00edn ch\u01b0\u01a1ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n, y\u00eau c\u1ea7u tr\u1ebb ph\u1ea3i \u1edf trong b\u1ea3ng CUU Chuong s\u1ebd b\u1eaft \u0111\u1ea7u t\u1eeb ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n l\u1edbp 2. V\u00ec v\u1eady, cha m\u1eb9 c\u1ea7n ki\u1ec3m tra b\u1ea3ng t\u00ednh nh\u00e2n th\u01b0\u1eddng xuy\u00ean \u0111\u1ec3 xem h\u1ecd c\u00f3 nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y hay kh\u00f4ng. N\u1ebfu kh\u00f4ng, b\u1ea1n c\u1ea7n y\u00eau c\u1ea7u tr\u1ebb ghi nh\u1edb, c\u0169ng nh\u01b0 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn B\u00ed m\u1eadt c\u1ee7a vi\u1ec7c h\u1ecdc b\u1ea3ng ch\u00edn ch\u01b0\u01a1ng m\u00e0 Kh\u1ec9 \u0111\u00e3 ph\u00e2n t\u00edch \u1edf \u0111\u00e2y.<\/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\/tinh-chat-ket-hop-cua-phep-nhan-4.jpg\" alt=\"B\u1ea3ng ch\u00edn ch\u01b0\u01a1ng l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 h\u1ecdc t\u00ednh to\u00e1n nh\u00e2n. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Thuc_hanh_voi_em_be_cua_ban_thuc_hanh_thuong_xuyen\"><\/span>Th\u1ef1c h\u00e0nh v\u1edbi em b\u00e9 c\u1ee7a b\u1ea1n, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Khi tr\u1ebb em \u0111\u00e3 h\u1ecdc v\u00e0 hi\u1ec3u l\u00fd thuy\u1ebft nh\u00e2n v\u1edbi b\u1ea3n ch\u1ea5t k\u1ebft h\u1ee3p, cha m\u1eb9 n\u00ean \u0111i c\u00f9ng con c\u00e1i \u0111\u1ec3 th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n. Y\u00eau c\u1ea7u con b\u1ea1n tham gia c\u00e1c l\u1edbp h\u1ecdc, s\u00e1ch gi\u00e1o khoa c\u0169ng nh\u01b0 t\u00ecm hi\u1ec3u th\u00eam th\u00f4ng tin m\u1edbi tr\u00ean internet, c\u00e1c c\u00e2u h\u1ecfi thi \u0111\u1ec3 th\u1ef1c h\u00e0nh.<\/p>\n<p dir=\"ltr\">Vi\u1ec7c th\u1ef1c h\u00e0nh, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o tr\u1ebb em l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c, tr\u00e1nh t\u00ecnh tr\u1ea1ng h\u1ecdc t\u1eadp v\u00e0 \u1ee9ng d\u1ee5ng tr\u01b0\u1edbc khi th\u1ef1c h\u00e0nh ho\u1eb7c gi\u1ea3i quy\u1ebft to\u00e1n ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_bai_tap_ve_viec_ket_hop_phep_nhan_lop_4_cho_tre_thuc_hanh\"><\/span>M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 vi\u1ec7c k\u1ebft h\u1ee3p ph\u00e9p nh\u00e2n l\u1edbp 4 cho tr\u1ebb 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 ph\u00e9p nh\u00e2n m\u00e0 em b\u00e9 c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u00e0 th\u1ef1c h\u00e0nh:<\/p>\n<p dir=\"ltr\">B\u00e0i 1: \u0110\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch thu\u1eadn ti\u1ec7n nh\u1ea5t<\/p>\n<p dir=\"ltr\">a) 12 x 7 x 19<\/p>\n<p dir=\"ltr\">b) 47 x 3 x 91<\/p>\n<p dir=\"ltr\">c) 23 x 82 x 19<\/p>\n<p dir=\"ltr\">d) 38 x 50 x 81<\/p>\n<p dir=\"ltr\">e) 80 x 6 x 18<\/p>\n<p dir=\"ltr\">f) 91 x 8 x 73<\/p>\n<p dir=\"ltr\">g) 84 x 71 x 8<\/p>\n<p dir=\"ltr\">h) 15 x 62 x 92<\/p>\n<p dir=\"ltr\">B\u00e0i 2: So s\u00e1nh bi\u1ec3u th\u1ee9c, \u0111i\u1ec1n v\u00e0o con d\u1ea5u&gt;, &lt;, = trong d\u1ea5u ch\u1ea5m<\/p>\n<p dir=\"ltr\">a) 82 x 61 x 11 &#8230; 73 x 26 x 12<\/p>\n<p dir=\"ltr\">b) 18 x 73 x 34 &#8230; 14 x 52 x 34<\/p>\n<p dir=\"ltr\">c) 37 x 61 x 7 &#8230; 17 x 81 x 5<\/p>\n<p dir=\"ltr\">d) 109 x 37 x 55 &#8230; 101 x 72 x 12<\/p>\n<p dir=\"ltr\">B\u00e0i 3: Vase n\u00f3i &#8220;15 x (18 x 12) = (15 x 12) x 18&#8221; \u0111\u00fang hay sai?<\/p>\n<p dir=\"ltr\">B\u00e0i 4: M\u1ed9t l\u1edbp h\u1ecdc c\u00f3 8 h\u00e0ng gh\u1ebf, m\u1ed7i h\u00e0ng gh\u1ebf c\u00f3 2 b\u00e0n, m\u1ed7i b\u1ea3ng 2 h\u1ecdc sinh. C\u00f3 bao nhi\u00eau sinh vi\u00ean \u1edf \u0111\u00f3?<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 5: K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p nh\u00e2n 19 x 200 = &#8230;. S\u1ed1 th\u00edch h\u1ee3p \u0111\u01b0\u1ee3c \u0111i\u1ec1n v\u00e0o d\u1ea5u ch\u1ea5m l\u00e0 g\u00ec?<\/p>\n<p dir=\"ltr\">B\u00e0i 6: C\u00f3 8 ph\u00f2ng h\u1ecdc, m\u1ed7i ph\u00f2ng c\u00f3 15 b\u1ed9 b\u00e0n gh\u1ebf, m\u1ed7i b\u1ed9 b\u00e0n gh\u1ebf v\u1edbi hai h\u1ecdc sinh ng\u1ed3i. H\u1ecfi c\u00f3 bao nhi\u00eau h\u1ecdc sinh \u0111ang ng\u1ed3i trong tr\u01b0\u1eddng?<\/p>\n<p dir=\"ltr\">B\u00e0i 7: M\u1ed9t t\u00fai g\u1ea1o n\u1eb7ng 40kg, m\u1ed9t t\u00fai ng\u00f4 n\u1eb7ng 50kg. M\u1ed9t chi\u1ebfc xe mang theo 30 t\u00fai g\u1ea1o v\u00e0 40 t\u00fai ng\u00f4. C\u00f3 bao nhi\u00eau kg xe h\u01a1i mang theo t\u1ea5t c\u1ea3 c\u00e1c km g\u1ea1o v\u00e0 ng\u00f4?<\/p>\n<p dir=\"ltr\">B\u00e0i 8: M\u1ed9t t\u1ea5m k\u00ednh vu\u00f4ng c\u00f3 c\u1ea1nh 50cm. T\u00ednh chu vi v\u00e0 di\u1ec7n t\u00edch vu\u00f4ng \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 9: \u0110\u01b0\u1ee3c t\u00ednh theo c\u00e1ch thu\u1eadn ti\u1ec7n nh\u1ea5t:<\/p>\n<p dir=\"ltr\">a) 17 \u00d7 5 \u00d7 2                   <\/p>\n<p dir=\"ltr\">b) 2 \u00d7 36 \u00d7 5<\/p>\n<p dir=\"ltr\">c) 123 \u00d7 20 \u00d7 5                     <\/p>\n<p dir=\"ltr\">D) 50 \u00d7 71 \u00d7 2<\/p>\n<p dir=\"ltr\">e) 50 \u00d7 2 \u00d7 41                       <\/p>\n<p dir=\"ltr\">f) 5 \u00d7 7 \u00d7 4 \u00d7 2<\/p>\n<p dir=\"ltr\">B\u00e0i 10: C\u00f3 8 xe ch\u1edf h\u00e0ng. M\u1ed7i chi\u1ebfc xe mang theo 4 g\u00f3i. M\u1ed7i g\u00f3i ch\u1ee9a 25 \u1ea5m \u0111i\u1ec7n. Y\u00eau c\u1ea7u 8 chi\u1ebfc xe mang theo bao nhi\u00eau \u0111i\u1ec7n?<\/p>\n<p dir=\"ltr\">B\u00e0i 11: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m:<\/p>\n<p dir=\"ltr\">(A \u00d7 125) \u00d7 8 = A \u00d7 (125 \u00d7 &#8230;) = A \u00d7 &#8230;<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 12: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m \u0111\u1ec3 t\u00ednh to\u00e1n thu\u1eadn ti\u1ec7n:<\/p>\n<p dir=\"ltr\">135 x 12 x 5 = &#8230; x (12 x &#8230;)<\/p>\n<p dir=\"ltr\">= &#8230; x &#8230;<\/p>\n<p dir=\"ltr\">= &#8230;<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 13: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m:<\/p>\n<p dir=\"ltr\">A \u00d7 B \u00d7 125 = (A \u00d7 B) \u00d7 &#8230; = A \u00d7 (B \u00d7 &#8230;)<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 14: (AXB) XC = AX (BXC). \u0110\u00fang hay sai?<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 15: T\u00ednh to\u00e1n:<\/p>\n<p dir=\"ltr\">a) 28 \u00d7 40                             <\/p>\n<p dir=\"ltr\">b) 450 \u00d7 80<\/p>\n<p dir=\"ltr\">c) 15 \u00d7 300                               <\/p>\n<p dir=\"ltr\">D) 510 \u00d7 200<\/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 m\u1ed9t b\u1ea3n t\u00f3m t\u1eaft c\u00e1c th\u00f4ng tin v\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n. Do \u0111\u00f3, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng thu\u1ed9c t\u00ednh n\u00e0y l\u00e0m cho t\u00ednh to\u00e1n d\u1ec5 d\u00e0ng v\u00e0 thu\u1eadn ti\u1ec7n h\u01a1n. V\u00ec v\u1eady, cha m\u1eb9 n\u00ean \u0111i c\u00f9ng \u0111\u1ec3 h\u1ed7 tr\u1ee3 tr\u1ebb em nghi\u00ean c\u1ee9u v\u00e0 ti\u1ebfp thu ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y t\u1ed1t h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p nh\u00e2n l\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n c\u1ee7a to\u00e1n h\u1ecdc c\u1ea5p 4 m\u00e0 h\u1ecd s\u1ebd h\u1ecdc. \u0110\u00e2y \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t b\u1ea3n ch\u1ea5t quan tr\u1ecdng c\u1ee7a ph\u00e9p nh\u00e2n, d\u1ef1a tr\u00ean \u0111\u00f3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc v\u00e0 gi\u1ea3i ph\u00e1p ch\u00ednh x\u00e1c. V\u00ec v\u1eady, \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1&#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-17147","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/17147","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=17147"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/17147\/revisions"}],"predecessor-version":[{"id":23148,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/17147\/revisions\/23148"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=17147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=17147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=17147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}