{"id":14963,"date":"2025-06-11T05:29:33","date_gmt":"2025-06-10T22:29:33","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=14963"},"modified":"2025-07-05T21:00:04","modified_gmt":"2025-07-05T14:00:04","slug":"ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/","title":{"rendered":"L\u00fd thuy\u1ebft v\u00e0 c\u00e1ch gi\u1ea3i b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 t\u00ecm y chi ti\u1ebft nh\u1ea5t"},"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\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Kien_thuc_can_nho_khi_giai_toan_lop_4_de_tim_y\" >Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb khi gi\u1ea3i to\u00e1n l\u1edbp 4 \u0111\u1ec3 t\u00ecm y<\/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\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Cac_hinh_thuc_toan_hoc_cua_lop_4\" >C\u00e1c h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc c\u1ee7a 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-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Mau_1_Co_ban\" >M\u1eabu 1: C\u01a1 b\u1ea3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Mau_2_Phia_ben_trai_la_mot_bieu_thuc_co_2_tinh_toan_Mat_ben_phai_la_mot_so\" >M\u1eabu 2: Ph\u00eda b\u00ean tr\u00e1i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c, c\u00f3 2 t\u00ednh to\u00e1n. M\u1eb7t b\u00ean ph\u1ea3i l\u00e0 m\u1ed9t s\u1ed1<\/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\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Mau_3_Ben_trai_la_mot_bieu_thuc_co_2_tinh_toan_Phia_ben_phai_la_bieu_thuc\" >M\u1eabu 3. B\u00ean tr\u00e1i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c, c\u00f3 2 t\u00ednh to\u00e1n. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 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-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Mau_4_Ben_trai_la_1_bieu_thuc_chua_dau_ngoac_don_co_2_tinh_toan_Phia_ben_phai_la_1\" >M\u1eabu 4. B\u00ean tr\u00e1i l\u00e0 1 bi\u1ec3u th\u1ee9c ch\u1ee9a d\u1ea5u ngo\u1eb7c \u0111\u01a1n, c\u00f3 2 t\u00ednh to\u00e1n. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 1<\/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\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Mau_5_Ben_trai_la_mot_bieu_thuc_chua_dau_ngoac_don_voi_2_tinh_toan_Phia_ben_phai_la_tong_su_khac_biet_san_pham\" >M\u1eabu 5. B\u00ean tr\u00e1i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c ch\u1ee9a d\u1ea5u ngo\u1eb7c \u0111\u01a1n, v\u1edbi 2 t\u00ednh to\u00e1n. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 t\u1ed5ng, s\u1ef1 kh\u00e1c bi\u1ec7t, s\u1ea3n ph\u1ea9m<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Bi_quyet_de_hoc_va_ghi_nho_kien_%E2%80%8B%E2%80%8Bthuc_toan_hoc_lop_4_de_tim_y_hieu_qua\" >B\u00ed quy\u1ebft \u0111\u1ec3 h\u1ecdc v\u00e0 ghi nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c to\u00e1n h\u1ecdc l\u1edbp 4 \u0111\u1ec3 t\u00ecm y hi\u1ec7u qu\u1ea3.<\/a><\/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\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Mot_so_bai_tap_de_tim_toan_hoc_lop_4_cho_tre_em_thuc_hanh\" >M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm to\u00e1n h\u1ecdc l\u1edbp 4 cho tr\u1ebb em 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-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cach-giai-bai-tap-toan-lop-4-tim-y-chi-tiet-nhat\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>To\u00e1n h\u1ecdc l\u1edbp 4 c\u1ee7a YY s\u1ebd t\u01b0\u01a1ng t\u1ef1 nh\u01b0 lo\u1ea1i t\u00ecm ki\u1ebfm to\u00e1n h\u1ecdc X, h\u1ecd s\u1ebd d\u1ef1a v\u00e0o c\u00e1c quy t\u1eafc gi\u1ea3i quy\u1ebft, x\u00e1c \u0111\u1ecbnh c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp \u0111\u1ec3 mang l\u1ea1i gi\u1ea3i ph\u00e1p ch\u00ednh x\u00e1c. T\u1ea5t c\u1ea3 s\u1ebd \u0111\u01b0\u1ee3c Kh\u1ec9 h\u01b0\u1edbng d\u1eabn chi ti\u1ebft 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=\"Kien_thuc_can_nho_khi_giai_toan_lop_4_de_tim_y\"><\/span>Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb khi gi\u1ea3i to\u00e1n l\u1edbp 4 \u0111\u1ec3 t\u00ecm y<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">T\u01b0\u01a1ng t\u1ef1 nh\u01b0 t\u00ecm ki\u1ebfm to\u00e1n h\u1ecdc l\u1edbp 4 x, \u1edf \u0111\u00e2y t\u00ecm ki\u1ebfm b\u00e0i t\u1eadp y ch\u1ec9 thay \u0111\u1ed5i c\u00e1c tham s\u1ed1 c\u1ea7n t\u00ecm t\u1eeb x sang y. Do \u0111\u00f3, \u0111\u1ec3 gi\u1ea3i quy\u1ebft b\u00e0i t\u1eadp n\u00e0y, b\u1ea1n c\u1ea7n nh\u1edb c\u00e1c c\u00f4ng th\u1ee9c v\u00e0 quy t\u1eafc \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00ednh to\u00e1n nh\u01b0 sau:<\/p>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u1ed5 sung: term + term = sum<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ph\u00e9p tr\u1eeb: S\u1ed1 l\u01b0\u1ee3ng c\u00e1c kho\u1ea3n kh\u1ea5u tr\u1eeb &#8211; tr\u1eeb s\u1ed1 = ch\u00eanh l\u1ec7ch<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ph\u00e2n chia: S\u1ed1 ph\u00e2n chia: chia s\u1ed1 chia = ch\u1ea5n th\u01b0\u01a1ng<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ph\u00e9p nh\u00e2n: y\u1ebfu t\u1ed1 ph\u1ee5 x s\u1ed1 = \u00e2m l\u01b0\u1ee3ng<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">Quy t\u1eafc t\u00ednh to\u00e1n<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u1ea7n th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n b\u00ean ngo\u00e0i tr\u01b0\u1edbc v\u00e0 sau<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Th\u1ef1c hi\u1ec7n b\u1ed9 ph\u1eadn \u0111\u1ea7u ti\u00ean, b\u1ed5 sung b\u1ed5 sung.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ed1i v\u1edbi c\u00e1c bi\u1ec3u th\u1ee9c ch\u1ec9 nh\u00e2n v\u00e0 chia, h\u00e3y l\u00e0m theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i sang ph\u1ea3i.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/toan-lop-4-tim-y-1.jpg\" alt=\"C\u00e1c c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc c\u01a1 b\u1ea3n c\u1ea7n ph\u1ea3i r\u00f5 r\u00e0ng. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_hinh_thuc_toan_hoc_cua_lop_4\"><\/span>C\u00e1c h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc c\u1ee7a l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi to\u00e1n h\u1ecdc cho l\u1edbp 4, ch\u00fang th\u01b0\u1eddng s\u1ebd g\u1eb7p m\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp 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-tim-y-2.jpg\" alt=\"To\u00e1n h\u1ecdc l\u1edbp 4 T\u00ecm Y c\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp kh\u00e1c nhau. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Co_ban\"><\/span>M\u1eabu 1: C\u01a1 b\u1ea3n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u1ecd hi\u1ec3u c\u00e1c quy t\u1eafc c\u1ee7a to\u00e1n h\u1ecdc \u0111\u1ec3 t\u00ecm t\u00ednh to\u00e1n b\u1ed5 sung c\u1ee7a b\u1ed9 ph\u1eadn t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm y bi\u1ebft, y \u00d7 33 = 1386<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>Y \u00d7 33 = 1386    <\/em><\/p>\n<p dir=\"ltr\"><em>y = 1386: 33<\/em><\/p>\n<p dir=\"ltr\"><em>y = 42     <\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Phia_ben_trai_la_mot_bieu_thuc_co_2_tinh_toan_Mat_ben_phai_la_mot_so\"><\/span>M\u1eabu 2: Ph\u00eda b\u00ean tr\u00e1i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c, c\u00f3 2 t\u00ednh to\u00e1n. M\u1eb7t b\u00ean ph\u1ea3i l\u00e0 m\u1ed9t s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u1ecd th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n \u1edf ph\u00eda b\u00ean tr\u00e1i v\u00e0 sau \u0111\u00f3 b\u00ean ph\u1ea3i. \u0110\u1ec3 t\u00ecm y, c\u1ea7n ph\u1ea3i tu\u00e2n th\u1ee7 c\u00f4ng th\u1ee9c v\u00e0 quy t\u1eafc \u0111\u01b0\u1ee3c \u0111\u01b0a ra.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm y bi\u1ebft, y: 7 x 34 = 8704<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>Y: 7 x 34 = 8704<\/em><\/p>\n<p dir=\"ltr\"><em>Y: 7 = 8704: 34<\/em><\/p>\n<p dir=\"ltr\"><em>Y: 7 = 256<\/em><\/p>\n<p dir=\"ltr\"><em>y = 256 x 7<\/em><\/p>\n<p dir=\"ltr\"><em>y = 1792  <\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_Ben_trai_la_mot_bieu_thuc_co_2_tinh_toan_Phia_ben_phai_la_bieu_thuc\"><\/span>M\u1eabu 3. B\u00ean tr\u00e1i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c, c\u00f3 2 t\u00ednh to\u00e1n. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 bi\u1ec3u th\u1ee9c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft: Th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n \u1edf ph\u00eda b\u00ean ph\u1ea3i, sau \u0111\u00f3 b\u00ean tr\u00e1i. T\u1eeb \u0111\u00f3, b\u1eaft \u0111\u1ea7u t\u00ecm X d\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c \u0111\u01b0\u1ee3c \u0111\u01b0a ra.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm y bi\u1ebft, 479 &#8211; yx 5 = 896: 4<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>479 &#8211; yx 5 = 896: 4<\/em><\/p>\n<p dir=\"ltr\"><em>Y x 5 = 479 &#8211; 224<\/em><\/p>\n<p dir=\"ltr\"><em>Y x 5 = 255<\/em><\/p>\n<p dir=\"ltr\"><em>Y = 255: 5<\/em><\/p>\n<p dir=\"ltr\"><em>Y = 51<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_4_Ben_trai_la_1_bieu_thuc_chua_dau_ngoac_don_co_2_tinh_toan_Phia_ben_phai_la_1\"><\/span>M\u1eabu 4. B\u00ean tr\u00e1i l\u00e0 1 bi\u1ec3u th\u1ee9c ch\u1ee9a d\u1ea5u ngo\u1eb7c \u0111\u01a1n, c\u00f3 2 t\u00ednh to\u00e1n. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft: Th\u1ef1c hi\u1ec7n c\u00e1c t\u00ednh to\u00e1n b\u00ean ngo\u00e0i tr\u01b0\u1edbc, ho\u00e0n th\u00e0nh trong ngo\u1eb7c. N\u00f3 l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o tu\u00e2n th\u1ee7 c\u00f4ng th\u1ee9c nh\u01b0 tr\u00ean.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm y bi\u1ebft, (19429 &#8211; x) + 1849 = 5938<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>(19429 &#8211; x) + 1849 = 5938<\/em><\/p>\n<p dir=\"ltr\"><em>19429 &#8211; x = 5938 &#8211; 1849<\/em><\/p>\n<p dir=\"ltr\"><em>19429 &#8211; x = 4089<\/em><\/p>\n<p dir=\"ltr\"><em>x = 19429 &#8211; 4089<\/em><\/p>\n<p dir=\"ltr\"><em>x = 15340<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_5_Ben_trai_la_mot_bieu_thuc_chua_dau_ngoac_don_voi_2_tinh_toan_Phia_ben_phai_la_tong_su_khac_biet_san_pham\"><\/span>M\u1eabu 5. B\u00ean tr\u00e1i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c ch\u1ee9a d\u1ea5u ngo\u1eb7c \u0111\u01a1n, v\u1edbi 2 t\u00ednh to\u00e1n. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 t\u1ed5ng, s\u1ef1 kh\u00e1c bi\u1ec7t, s\u1ea3n ph\u1ea9m<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft: Th\u1ef1c hi\u1ec7n c\u00e1c v\u1ea5n \u0111\u1ec1 to\u00e1n h\u1ecdc \u1edf ph\u00eda b\u00ean ph\u1ea3i, sau \u0111\u00f3 ti\u1ebfn h\u00e0nh gi\u1ea3i quy\u1ebft t\u00ednh to\u00e1n b\u00ean ngo\u00e0i v\u00e0 sau \u0111\u00f3 \u0111\u1ebfn trong ngo\u1eb7c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c quy t\u1eafc v\u00e0 c\u00f4ng th\u1ee9c \u0111\u00fang.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm y bi\u1ebft (8332 &#8211; y) + 3959 = 2820 x 3<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>(8332 &#8211; y) + 3959 = 2820 x 3<\/em><\/p>\n<p dir=\"ltr\"><em>(8332 &#8211; y) + 3959 = 8460<\/em><\/p>\n<p dir=\"ltr\"><em>8332 &#8211; y = 8460 &#8211; 3959<\/em><\/p>\n<p dir=\"ltr\"><em>8332 &#8211; y = 4001<\/em><\/p>\n<p dir=\"ltr\"><em>y = 8332 &#8211; 4001<\/em><\/p>\n<p dir=\"ltr\"><em>y = 3831<\/em><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_de_hoc_va_ghi_nho_kien_%E2%80%8B%E2%80%8Bthuc_toan_hoc_lop_4_de_tim_y_hieu_qua\"><\/span>B\u00ed quy\u1ebft \u0111\u1ec3 h\u1ecdc v\u00e0 ghi nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c to\u00e1n h\u1ecdc l\u1edbp 4 \u0111\u1ec3 t\u00ecm y hi\u1ec7u qu\u1ea3.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap tr\u1ebb d\u1ec5 d\u00e0ng h\u1ea5p th\u1ee5, h\u00e3y nh\u1edb v\u00e0 th\u1ef1c h\u00e0nh t\u1ed1t ki\u1ebfn \u200b\u200bth\u1ee9c \u0111\u1ec3 t\u00ecm to\u00e1n h\u1ecdc l\u1edbp 4, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u1eddi khuy\u00ean m\u00e0 ph\u1ee5 huynh c\u00f3 th\u1ec3 tham kh\u1ea3o h\u01b0\u1edbng d\u1eabn tr\u1ebb h\u1ecdc:<\/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-tim-y-3.jpg\" alt=\"Th\u1ef1c h\u00e0nh v\u1edbi em b\u00e9 c\u1ee7a b\u1ea1n, th\u1ef1c h\u00e0nh to\u00e1n h\u1ecdc \u0111\u1ec3 t\u00ecm y th\u01b0\u1eddng xuy\u00ean l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hi\u1ec3u c\u00e1c quy t\u1eafc, c\u00f4ng th\u1ee9c gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 to\u00e1n h\u1ecdc: \u0111\u1ec3 gi\u1ea3i t\u1eadp b\u00e0i t\u1eadp l\u1edbp 4, y\u00eau c\u1ea7u tr\u1ebb ph\u1ea3i ch\u1eafc ch\u1eafn v\u1ec1 c\u00f4ng th\u1ee9c t\u00ecm ki\u1ebfm \u00fd t\u01b0\u1edfng ch\u01b0a bi\u1ebft v\u00e0 quy t\u1eafc t\u00ednh to\u00e1n tr\u00ean. N\u1ebfu em b\u00e9 c\u1ee7a b\u1ea1n kh\u00f4ng hi\u1ec3u ho\u1eb7c g\u1eb7p kh\u00f3 kh\u0103n, cha m\u1eb9 c\u1ea7n h\u01b0\u1edbng d\u1eabn v\u00e0 c\u1ee7ng c\u1ed1 con c\u00e1i k\u1ecbp th\u1eddi.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n nhanh: Tr\u00ean th\u1ef1c t\u1ebf, t\u00ecm Y c\u0169ng l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c c\u01a1 b\u1ea3n c\u1ee7a nhi\u1ec1u t\u00ednh to\u00e1n kh\u00e1c nhau. Do \u0111\u00f3, cha m\u1eb9 c\u00f3 th\u1ec3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ed9t s\u1ed1 c\u00e1ch \u0111\u1ec3 d\u1ea1y l\u00f2ng tr\u1eafc \u1ea9n tinh th\u1ea7n \u0111\u1ec3 chia r\u1ebd \u0111\u1ec3 h\u1ed7 tr\u1ee3 em b\u00e9 t\u00ednh to\u00e1n nhanh ch\u00f3ng v\u00e0 ch\u00ednh x\u00e1c.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean: &#8220;H\u1ecdc h\u00e0nh v\u1edbi h\u00e0nh&#8221; lu\u00f4n l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng khi h\u1ecdc t\u1eadp ho\u1eb7c l\u00e0m vi\u1ec7c. Do \u0111\u00f3, ph\u1ee5 huynh c\u1ea7n khuy\u1ebfn kh\u00edch v\u00e0 y\u00eau c\u1ea7u tr\u1ebb th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n t\u1eeb vi\u1ec7c l\u00e0m b\u00e0i t\u1eadp v\u1ec1 nh\u00e0 trong l\u1edbp, c\u00e1c b\u00e0i t\u1eadp trong s\u00e1ch gi\u00e1o khoa, b\u00e0i t\u1eadp, h\u1ecdc th\u00eam ki\u1ebfn \u200b\u200bth\u1ee9c m\u1edbi &#8230; do \u0111\u00f3 t\u0103ng kh\u1ea3 n\u0103ng ti\u1ebfp thu, nh\u1edb v\u00e0 h\u1ecdc to\u00e1n c\u1ee7a em b\u00e9 t\u1ed1t h\u01a1n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc t\u1eeb khi c\u00f2n tr\u1ebb v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9: \u0110\u00e2y l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng gi\u1ea3ng d\u1ea1y 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. N\u1ed9i dung b\u00e0i h\u1ecdc \u0111\u01b0\u1ee3c theo s\u00e1t b\u1edfi s\u00e1ch gi\u00e1o khoa, nh\u01b0ng \u0111\u01b0\u1ee3c d\u1ea1y v\u1edbi nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p t\u00edch c\u1ef1c nh\u01b0 d\u1ea1y to\u00e1n th\u00f4ng qua video, h\u00ecnh \u1ea3nh ho\u1ea1t h\u00ecnh vui nh\u1ed9n, tr\u00f2 ch\u01a1i t\u01b0\u01a1ng t\u00e1c, s\u00e1ch b\u1ed5 sung &#8230; \u0111\u1ec3 gi\u00fap tr\u1ebb hi\u1ec3u g\u1ed1c r\u1ec5 c\u1ee7a v\u1ea5n \u0111\u1ec1 thay v\u00ec h\u1ecdc v\u1eb9t, c\u0169ng nh\u01b0 g\u00f3p ph\u1ea7n c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng suy ngh\u0129 v\u00e0 y\u00eau th\u00edch to\u00e1n h\u1ecdc t\u1eeb th\u1eddi th\u01a1 \u1ea5u. \u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 to\u00e1n h\u1ecdc kh\u1ec9, ph\u1ee5 huynh c\u00f3 th\u1ec3 \u0111\u0103ng k\u00fd t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed ho\u1eb7c theo d\u00f5i video sau:<\/p>\n<\/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\/nhantuvanmienphi.png\" alt=\"\" width=\"200\" height=\"39\"><\/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_bai_tap_de_tim_toan_hoc_lop_4_cho_tre_em_thuc_hanh\"><\/span>M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm to\u00e1n h\u1ecdc l\u1edbp 4 cho tr\u1ebb em th\u1ef1c h\u00e0nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Sau khi bi\u1ebft l\u00fd thuy\u1ebft, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u0111\u1ec3 t\u00ecm y t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn to\u00e1n h\u1ecdc \u0111\u1ec3 t\u00ecm Y ti\u00ean ti\u1ebfn \u0111\u1ec3 h\u1ecd c\u00f3 th\u1ec3 th\u1ef1c h\u00e0nh c\u00f9ng nhau:<\/p>\n<p dir=\"ltr\">B\u00e0i 1: T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">a) (1747 + y): 5 = 2840<\/p>\n<p dir=\"ltr\">b) (2478 &#8211; y) x 16 = 18496<\/p>\n<p dir=\"ltr\">C) (1848 + y): 15 = 83<\/p>\n<p dir=\"ltr\">E) (4282 + y) x 8 = 84392<\/p>\n<p dir=\"ltr\">f) (2482 &#8211; y) &#8211; 1940 = 492<\/p>\n<p dir=\"ltr\">g) (18490 + y) + 428 = 49202<\/p>\n<p dir=\"ltr\">h) (4627 + y) &#8211; 9290 = 2420<\/p>\n<p dir=\"ltr\">B\u00e0i 2: T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">A) Y + 678 = 7818        <\/p>\n<p dir=\"ltr\">b) 4029 + y = 7684            <\/p>\n<p dir=\"ltr\">C) Y &#8211; 1358 = 4768           <\/p>\n<p dir=\"ltr\">D) 2495 &#8211; y = 698<\/p>\n<p dir=\"ltr\">e) 36 \u00d7 y = 27612              <\/p>\n<p dir=\"ltr\">f) y: 50 = 218            <\/p>\n<p dir=\"ltr\">g) 4080: y = 24<\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">A) Y + 1234 + 3012 = 4724<\/p>\n<p dir=\"ltr\">B) Y &#8211; 285 + 85 = 2495<\/p>\n<p dir=\"ltr\">C) 2748 &#8211; Y + 8593 = 10495<\/p>\n<p dir=\"ltr\">d) 8349 + y &#8211; 5993 = 95902<\/p>\n<p dir=\"ltr\">E) YX 8: 9 = 8440<\/p>\n<p dir=\"ltr\">f) 38934: yx 4 = 84<\/p>\n<p dir=\"ltr\">g) 85 XY: 19 = 5839<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 4: T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">A) Y + 847 x 2 = 1953 &#8211; 74<\/p>\n<p dir=\"ltr\">B) Y &#8211; 7015: 5 = 374 x 7<\/p>\n<p dir=\"ltr\">C) Y: (7 x 18) = 5839 + 8591<\/p>\n<p dir=\"ltr\">D) Y: 9 &#8211; 8399 = 4938 &#8211; 924<\/p>\n<p dir=\"ltr\">e) 3179: y + 999 = 593 x 2<\/p>\n<p dir=\"ltr\">f) 1023 + y &#8211; 203 = 9948: 12<\/p>\n<p dir=\"ltr\">g) 583 XY + 8492 = 429900 &#8211; 1065<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 5: T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">a) (y + 2859) x 2 = 5830 x 2<\/p>\n<p dir=\"ltr\">B) (Y &#8211; 4737): 3 = 5738 &#8211; 943<\/p>\n<p dir=\"ltr\">C) (Y + 5284) x 5 = 47832 + 8593<\/p>\n<p dir=\"ltr\">D) (Y &#8211; 7346): 9 = 8590 x 2<\/p>\n<p dir=\"ltr\">E) (27582 + y) &#8211; 724 = 53839 &#8211; 8428<\/p>\n<p dir=\"ltr\">f) (7380 &#8211; y): 132 = 328 &#8211; 318<\/p>\n<p dir=\"ltr\">g) (9028 + y) x 13 = 85930 + 85930<\/p>\n<table style=\"border-collapse: collapse;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5189%\">\n<p style=\"text-align: center\">Gi\u00fap tr\u1ebb ph\u00e1t tri\u1ec3n ng\u00f4n ng\u1eef, suy ngh\u0129, tr\u00ed th\u00f4ng minh v\u00e0 c\u1ea3m x\u00fac to\u00e0n di\u1ec7n trong giai \u0111o\u1ea1n v\u00e0ng v\u1edbi b\u1ed9 h\u1ecdc t\u1eadp c\u1ee7a kh\u1ec9. V\u00f4 s\u1ed1 qu\u00e0 t\u1eb7ng v\u00e0 \u01b0u \u0111\u00e3i h\u1ea5p d\u1eabn l\u00ean t\u1edbi 50% khi \u0111\u0103ng k\u00fd kh\u00f3a h\u1ecdc h\u00f4m nay.<\/p>\n<p style=\"text-align: center\">\n<p><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/timhieungay.png\" alt=\"\" width=\"200\" height=\"41\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\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 to\u00e1n h\u1ecdc l\u1edbp 4 \u0111\u1ec3 t\u00ecm y t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao \u0111\u1ec3 h\u1ecdc sinh v\u00e0 ph\u1ee5 huynh c\u00f3 th\u1ec3 tham kh\u1ea3o. Do \u0111\u00f3 gi\u00fap qu\u00e1 tr\u00ecnh h\u01b0\u1edbng d\u1eabn tr\u1ebb em h\u1ecdc c\u00e1ch hi\u1ec3u v\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To\u00e1n h\u1ecdc l\u1edbp 4 c\u1ee7a YY s\u1ebd t\u01b0\u01a1ng t\u1ef1 nh\u01b0 lo\u1ea1i t\u00ecm ki\u1ebfm to\u00e1n h\u1ecdc X, h\u1ecd s\u1ebd d\u1ef1a v\u00e0o c\u00e1c quy t\u1eafc gi\u1ea3i quy\u1ebft, x\u00e1c \u0111\u1ecbnh c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp \u0111\u1ec3 mang l\u1ea1i gi\u1ea3i ph\u00e1p ch\u00ednh x\u00e1c. T\u1ea5t c\u1ea3 s\u1ebd \u0111\u01b0\u1ee3c Kh\u1ec9 h\u01b0\u1edbng d\u1eabn chi ti\u1ebft trong b\u00e0i vi\u1ebft sau. Xem t\u1ea5t c\u1ea3 Ki\u1ebfn&#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-14963","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14963","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=14963"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14963\/revisions"}],"predecessor-version":[{"id":17961,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14963\/revisions\/17961"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=14963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=14963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=14963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}