{"id":14971,"date":"2025-06-11T06:49:27","date_gmt":"2025-06-10T23:49:27","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=14971"},"modified":"2025-07-05T21:40:07","modified_gmt":"2025-07-05T14:40:07","slug":"huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn h\u1ecdc v\u00e0 gi\u1ea3i b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 t\u00ecm x trong ngo\u1eb7c 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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Kien_thuc_can_nho_khi_giai_quyet_toan_hoc_lop_4_tim_thay_x_trong_ngoac\" >Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb khi gi\u1ea3i quy\u1ebft to\u00e1n h\u1ecdc l\u1edbp 4 t\u00ecm th\u1ea5y x trong ngo\u1eb7c<\/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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Cac_loai_bai_tap_va_giai_phap_de_tim_X_Lop_4_trong_ngoac\" >C\u00e1c lo\u1ea1i b\u00e0i t\u1eadp v\u00e0 gi\u1ea3i ph\u00e1p \u0111\u1ec3 t\u00ecm X L\u1edbp 4 trong ngo\u1eb7c<\/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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Mau_1_Ben_trai_la_1_bieu_thuc_chua_dau_ngoac_don_co_2_tinh_toan_Phia_ben_phai_la_1_so\" >M\u1eabu 1. 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 s\u1ed1.<\/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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Mau_2_Ben_trai_la_1_bieu_thuc_chua_dau_ngoac_don_voi_2_tinh_toan_Phia_ben_phai_la_tong_so_hieu_qua_va_san_pham\" >M\u1eabu 2. B\u00ean tr\u00e1i l\u00e0 1 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\u1ed1, hi\u1ec7u qu\u1ea3 v\u00e0 s\u1ea3n ph\u1ea9m.<\/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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Mau_3_Phia_ben_trai_la_tong_su_khac_biet_san_pham_va_thuong_tich_Phia_ben_phai_la_mot_bieu_thuc_chua_dau_ngoac_don_voi_2_tinh_toan\" >M\u1eabu 3: Ph\u00eda b\u00ean tr\u00e1i l\u00e0 t\u1ed5ng, s\u1ef1 kh\u00e1c bi\u1ec7t, s\u1ea3n ph\u1ea9m v\u00e0 th\u01b0\u01a1ng t\u00edch. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c ch\u1ee9a d\u1ea5u ngo\u1eb7c \u0111\u01a1n v\u1edbi 2 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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Bi_quyet_hoc_tap_va_ghi_nho_kien_%E2%80%8B%E2%80%8Bthuc_toan_hoc_lop_4_de_tim_X_trong_ngoac_mot_cach_hieu_qua\" >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 \u0111\u1ec3 t\u00ecm X trong ngo\u1eb7c m\u1ed9t c\u00e1ch 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-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-chi-tiet-nhat\/#Mot_so_bai_tap_de_tim_X_trong_Toan_hoc_lop_4_cho_tre_em\" >M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm X trong To\u00e1n h\u1ecdc l\u1edbp 4 cho tr\u1ebb em<\/a><\/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\/huong-dan-hoc-va-giai-bai-tap-toan-lop-4-tim-x-trong-ngoac-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 T\u00ecm X trong ngo\u1eb7c l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc \u0111\u1eb7c bi\u1ec7t, v\u1edbi m\u1ed9t quy t\u1eafc gi\u1ea3i ri\u00eang bi\u1ec7t. Do \u0111\u00f3, \u0111\u1ec3 gi\u00fap b\u00e9 hi\u1ec3u b\u1ea3n ch\u1ea5t, c\u0169ng nh\u01b0 chinh ph\u1ee5c h\u00ecnh th\u1ee9c 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=\"Kien_thuc_can_nho_khi_giai_quyet_toan_hoc_lop_4_tim_thay_x_trong_ngoac\"><\/span>Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb khi gi\u1ea3i quy\u1ebft to\u00e1n h\u1ecdc l\u1edbp 4 t\u00ecm th\u1ea5y x trong ngo\u1eb7c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 c\u00f3 th\u1ec3 chinh ph\u1ee5c c\u00e1c b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm l\u1edbp 4 n\u00f3i chung, \u0111\u1eb7c bi\u1ec7t t\u00ecm X trong ngo\u1eb7c, h\u1ecd c\u1ea7n nh\u1edb nh\u1eefng ki\u1ebfn \u200b\u200bth\u1ee9c 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-x-trong-ngoac-1.jpg\" alt=\"Khi gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm X, h\u1ecd c\u1ea7n nh\u1edb r\u00f5 quy t\u1eafc gi\u1ea3i to\u00e1n. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_loai_bai_tap_va_giai_phap_de_tim_X_Lop_4_trong_ngoac\"><\/span>C\u00e1c lo\u1ea1i b\u00e0i t\u1eadp v\u00e0 gi\u1ea3i ph\u00e1p \u0111\u1ec3 t\u00ecm X L\u1edbp 4 trong ngo\u1eb7c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">V\u1edbi lo\u1ea1i to\u00e1n h\u1ecdc l\u1edbp 4 \u0111\u1ec3 t\u00ecm X trong ngo\u1eb7c \u0111\u01a1n, th\u01b0\u1eddng s\u1ebd c\u00f3 c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp v\u00e0 gi\u1ea3i ph\u00e1p 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-x-trong-ngoac-2.jpg\" alt=\"V\u1edbi c\u00e1c b\u00e0i t\u1eadp t\u00ecm ki\u1ebfm X trong ngo\u1eb7c \u0111\u01a1n s\u1ebd c\u00f3 nhi\u1ec1u h\u00ecnh th\u1ee9c 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_Ben_trai_la_1_bieu_thuc_chua_dau_ngoac_don_co_2_tinh_toan_Phia_ben_phai_la_1_so\"><\/span>M\u1eabu 1. 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 s\u1ed1.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i ph\u00e1p: H\u1ecd \u0111\u00e3 ti\u1ebfn h\u00e0nh t\u00ednh to\u00e1n c\u00e1c bi\u1ec3u th\u1ee9c b\u00ean ngo\u00e0i tr\u01b0\u1edbc, v\u00e0 sau \u0111\u00f3 \u0111i v\u00e0o d\u1ea5u ngo\u1eb7c. N\u00f3 l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 tu\u00e2n th\u1ee7 c\u00f4ng th\u1ee9c v\u00e0 quy t\u1eafc nh\u01b0 tr\u00ean.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm X Bi\u1ebft (1848 &#8211; X): 15 = 83<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>(1848 &#8211; x): 15 = 83<\/em><\/p>\n<p dir=\"ltr\"><em>1848 &#8211; x = 83 x 15<\/em><\/p>\n<p dir=\"ltr\"><em>1848 &#8211; x = 1245<\/em><\/p>\n<p dir=\"ltr\"><em>x = 1848 &#8211; 1245<\/em><\/p>\n<p dir=\"ltr\"><em>x = 603<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Ben_trai_la_1_bieu_thuc_chua_dau_ngoac_don_voi_2_tinh_toan_Phia_ben_phai_la_tong_so_hieu_qua_va_san_pham\"><\/span>M\u1eabu 2. B\u00ean tr\u00e1i l\u00e0 1 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\u1ed1, hi\u1ec7u qu\u1ea3 v\u00e0 s\u1ea3n ph\u1ea9m.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: Th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n \u1edf ph\u00eda b\u00ean ph\u1ea3i. Sau \u0111\u00f3 ti\u1ebfn h\u00e0nh gi\u1ea3i quy\u1ebft t\u00ednh to\u00e1n \u1edf ph\u00eda b\u00ean ph\u1ea3i t\u01b0\u01a1ng t\u1ef1 nh\u01b0 M\u1eabu 1.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm X Bi\u1ebft (x + 5284) x 5 = 47832 + 8593<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>(x + 5284) x 5 = 47832 + 8593<\/em><\/p>\n<p dir=\"ltr\"><em>(x + 5284) x 5 = 56425<\/em><\/p>\n<p dir=\"ltr\"><em>x + 5284 = 56425: 5<\/em><\/p>\n<p dir=\"ltr\"><em>x + 5284 = 11285<\/em><\/p>\n<p dir=\"ltr\"><em>x = 11285 &#8211; 5284 <\/em><\/p>\n<p dir=\"ltr\"><em>x = 6001<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_Phia_ben_trai_la_tong_su_khac_biet_san_pham_va_thuong_tich_Phia_ben_phai_la_mot_bieu_thuc_chua_dau_ngoac_don_voi_2_tinh_toan\"><\/span>M\u1eabu 3: Ph\u00eda b\u00ean tr\u00e1i l\u00e0 t\u1ed5ng, s\u1ef1 kh\u00e1c bi\u1ec7t, s\u1ea3n ph\u1ea9m v\u00e0 th\u01b0\u01a1ng t\u00edch. Ph\u00eda b\u00ean ph\u1ea3i l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c ch\u1ee9a d\u1ea5u ngo\u1eb7c \u0111\u01a1n v\u1edbi 2 t\u00ednh to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft: Tr\u00e1i ng\u01b0\u1ee3c v\u1edbi M\u1eabu 2, ch\u00fang t\u00f4i c\u0169ng s\u1ebd ti\u1ebfn h\u00e0nh t\u00ednh to\u00e1n \u1edf ph\u00eda b\u00ean tr\u00e1i tr\u01b0\u1edbc ph\u00eda b\u00ean ph\u1ea3i. Sau \u0111\u00f3 b\u1eaft \u0111\u1ea7u gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp b\u00ean ngo\u00e0i ngo\u1eb7c tr\u01b0\u1edbc v\u00e0 sau \u0111\u00f3.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ecm X Bi\u1ebft 4561: 3 = (x + 2512)<\/em><\/p>\n<p dir=\"ltr\"><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/em><\/p>\n<p dir=\"ltr\"><em>4263: 3 = (x + 202) x 7<\/em><\/p>\n<p dir=\"ltr\"><em>1421 = (x + 202) x 7<\/em><\/p>\n<p dir=\"ltr\"><em>1421: 7 = x + 202<\/em><\/p>\n<p dir=\"ltr\"><em>203 = x + 202<\/em><\/p>\n<p dir=\"ltr\"><em>=&gt; x = 203 &#8211; 202<\/em><\/p>\n<p dir=\"ltr\"><em>=&gt; x = 1<\/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_de_tim_X_trong_ngoac_mot_cach_hieu_qua\"><\/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 \u0111\u1ec3 t\u00ecm X trong ngo\u1eb7c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc, hi\u1ec3u v\u00e0 chinh ph\u1ee5c lo\u1ea1i to\u00e1n h\u1ecdc \u0111\u1ec3 t\u00ecm X trong ngo\u1eb7c c\u1ea5p l\u1edbp 4, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 m\u1eb9o \u0111\u1ec3 ph\u1ee5 huynh v\u00e0 tr\u1ebb em n\u1ed9p \u0111\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\/toan-lop-4-tim-x-trong-ngoac-3.jpg\" alt=\"Cha m\u1eb9 c\u1ea7n \u0111i c\u00f9ng v\u00e0 h\u01b0\u1edbng d\u1eabn tr\u1ebb em h\u1ecdc chi ti\u1ebft. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1eafm v\u1eefng c\u00f4ng th\u1ee9c, c\u00e1c quy t\u1eafc \u0111\u1ec3 th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n: Ch\u1ec9 khi hi\u1ec3u c\u00e1c quy t\u1eafc, c\u00f4ng th\u1ee9c cho X th\u1ef1c s\u1ef1 c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft b\u00e0i t\u1eadp. V\u00ec v\u1eady, cha m\u1eb9 c\u1ea7n h\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 h\u1ecd c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 hi\u1ec3u.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u00c1p d\u1ee5ng m\u1ed9t s\u1ed1 k\u1ef9 n\u0103ng v\u00e0 m\u1eb9o khi t\u00ecm X: d\u01b0\u1edbi d\u1ea1ng b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm X th\u01b0\u1eddng c\u00f3 m\u1eb9o ch\u00ednh khi \u0111\u1ed1i s\u1ed1 t\u1eeb b\u00ean n\u00e0y sang b\u00ean kia, ch\u00fang ta ph\u1ea3i th\u1ef1c hi\u1ec7n s\u1ef1 ph\u1ea3n \u0111\u1ed1i c\u1ee7a s\u1ed1 \u0111\u00f3. V\u00ed d\u1ee5, x &#8211; 5 = 3, ch\u00fang t\u00f4i thay \u0111\u1ed5i 5 sang b\u00ean ph\u1ea3i t\u1eeb &#8211; 5 \u0111\u1ebfn 5 + 5 \u0111\u1ec3 ch\u00fang t\u00f4i nh\u1eadn \u0111\u01b0\u1ee3c x = 3 + 5 = 8. C\u00f9ng v\u1edbi \u0111\u00f3, cha m\u1eb9 c\u00f3 th\u1ec3 h\u1ecdc m\u1ed9t s\u1ed1 c\u00e1ch \u0111\u1ec3 t\u00ednh to\u00e1n ph\u00e9p tr\u1eeb tinh th\u1ea7n c\u1ee7a ph\u00e9p nh\u00e2n chia \u0111\u1ec3 h\u1ed7 tr\u1ee3 em b\u00e9 t\u00ednh to\u00e1n nhanh h\u01a1n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Th\u1ef1c h\u00e0nh, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean: \u0110\u1ec3 tr\u00e1nh tr\u01b0\u1eddng h\u1ee3p &#8216;h\u1ecdc tr\u01b0\u1edbc v\u00e0 sau n\u00e0y, cha m\u1eb9 n\u00ean khuy\u1ebfn kh\u00edch, y\u00eau c\u1ea7u em b\u00e9 th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean.<\/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 cho tr\u1ebb em 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 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi kh\u1ec9 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 t\u1ed5ng h\u1ee3p ch\u1eb7t ch\u1ebd ch\u1eb7t ch\u1ebd, k\u1ebft h\u1ee3p v\u1edbi nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y \u0111\u1ec3 gi\u00fap tr\u1ebb em ti\u1ebfp thu v\u00e0 ghi nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c d\u1ec5 d\u00e0ng h\u01a1n. Ph\u1ee5 huynh c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y c\u1ee7a Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math th\u00f4ng qua 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:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/timhieungay.png\" alt=\"\" width=\"200\" height=\"41\"><\/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_X_trong_Toan_hoc_lop_4_cho_tre_em\"><\/span>M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp \u0111\u1ec3 t\u00ecm X trong To\u00e1n h\u1ecdc l\u1edbp 4 cho tr\u1ebb em<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 to\u00e1n l\u1edbp 4 \u0111\u1ec3 t\u00ecm X trong d\u1ea5u ngo\u1eb7c trong s\u00e1ch gi\u00e1o khoa v\u00e0 m\u1edf r\u1ed9ng cho tr\u1ebb th\u1ef1c h\u00e0nh c\u00f9ng nhau:<\/p>\n<p dir=\"ltr\">B\u00e0i 1. T\u00ecm x bi\u1ebft<\/p>\n<p dir=\"ltr\">a) (x + 2859) x 2 = 5830 x 2<\/p>\n<p dir=\"ltr\">B) (X &#8211; 4737): 3 = 5738 &#8211; 943<\/p>\n<p dir=\"ltr\">C) (x + 5284) x 5 = 47832 + 8593<\/p>\n<p dir=\"ltr\">D) (x &#8211; 7346): 9 = 8590 x 2<\/p>\n<p dir=\"ltr\">B\u00e0i 2. T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">a) (8332 &#8211; y) + 3959 = 2820 x 3<\/p>\n<p dir=\"ltr\">b) (27582 + y) &#8211; 724 = 53839 &#8211; 8428<\/p>\n<p dir=\"ltr\">c) (7380 &#8211; y): 132 = 328 &#8211; 318<\/p>\n<p dir=\"ltr\">D) (9028 + y) x 13 = 85930 + 85930<\/p>\n<p dir=\"ltr\">B\u00e0i 3. T\u00ecm x bi\u1ebft<\/p>\n<p dir=\"ltr\">a) (1747 + x): 5 = 2840<\/p>\n<p dir=\"ltr\">b) (2478 &#8211; x) x 16 = 18496<\/p>\n<p dir=\"ltr\">C) (1848 + x): 15 = 83<\/p>\n<p dir=\"ltr\">D) (4282 + x) x 8 = 84392<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 4. T\u00ecm b\u1ea1n bi\u1ebft<\/p>\n<p dir=\"ltr\">a) (19429 &#8211; x) + 1849 = 5938<\/p>\n<p dir=\"ltr\">b) (2482 &#8211; x) &#8211; 1940 = 492<\/p>\n<p dir=\"ltr\">c) (18490 + x) + 428 = 49202<\/p>\n<p dir=\"ltr\">D) (4627 + x) &#8211; 9290 = 2420<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 5. T\u00ecm x bi\u1ebft:<\/p>\n<p dir=\"ltr\">a) (x + 208) x 127 = 31115          <\/p>\n<p dir=\"ltr\">b) (x + 5217): 115 = 308<\/p>\n<p dir=\"ltr\">C) (x &#8211; 3048): 145 = 236              <\/p>\n<p dir=\"ltr\">D) (4043 &#8211; x) x 84 = 28224<\/p>\n<p dir=\"ltr\">B\u00e0i 6: T\u00ecm X BI\u1ebeT<\/p>\n<p dir=\"ltr\">A) (x + 4375) x 4 = 59930 &#8211; 9583<\/p>\n<p dir=\"ltr\">B) (x: 8) x 19 = 281 + 129<\/p>\n<p dir=\"ltr\">C) (x &#8211; 7308): 12 = 593 x 3<\/p>\n<p dir=\"ltr\">D) 4036 + (824: x) = 72036: 3<\/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 to\u00e1n h\u1ecdc c\u1ea5p 4 \u0111\u1ec3 t\u00ecm X trong ngo\u1eb7c. Hy v\u1ecdng d\u1ef1a tr\u00ean th\u00f4ng tin tr\u00ean, n\u00f3 s\u1ebd gi\u00fap ph\u1ee5 huynh c\u00f3 nhi\u1ec1u t\u00e0i li\u1ec7u h\u01a1n \u0111\u1ec3 h\u1ed7 tr\u1ee3 tr\u1ebb d\u1ea1y v\u00e0 chinh ph\u1ee5c h\u00ecnh th\u1ee9c t\u1eadp th\u1ec3 d\u1ee5c n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 nh\u1ea5t.<\/p>\n<p>Ngu\u1ed3n: <a href=\"https:\/\/www.ckconitsha.com\/vn\/\">https:\/\/www.ckconitsha.com\/vn\/<\/a> T\u00e1c gi\u1ea3: <a href=\"https:\/\/www.ckconitsha.com\/vn\/author\/nguyenlandung\">Nguy\u1ec5n L\u00e2n d\u0169ng<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>To\u00e1n h\u1ecdc l\u1edbp 4 T\u00ecm X trong ngo\u1eb7c l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc \u0111\u1eb7c bi\u1ec7t, v\u1edbi m\u1ed9t quy t\u1eafc gi\u1ea3i ri\u00eang bi\u1ec7t. Do \u0111\u00f3, \u0111\u1ec3 gi\u00fap b\u00e9 hi\u1ec3u b\u1ea3n ch\u1ea5t, c\u0169ng nh\u01b0 chinh ph\u1ee5c h\u00ecnh th\u1ee9c 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. Xem t\u1ea5t c\u1ea3&#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-14971","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14971","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=14971"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14971\/revisions"}],"predecessor-version":[{"id":18014,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14971\/revisions\/18014"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=14971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=14971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=14971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}