{"id":19357,"date":"2025-07-07T05:45:04","date_gmt":"2025-07-06T22:45:04","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=19357"},"modified":"2025-07-07T07:35:38","modified_gmt":"2025-07-07T00:35:38","slug":"tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/","title":{"rendered":"Tuy\u1ec7t chi\u00eau gi\u00fap b\u00e9 h\u1ecdc v\u00e0 ghi nh\u1edb s\u1ed1 20 la m\u00e3 c\u1ef1c chu\u1ea9n"},"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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Lam_the_nao_de_doc_so_20_La_Ma_nhu_the_nao\" >L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc s\u1ed1 20 La M\u00e3 nh\u01b0 th\u1ebf n\u00e0o?<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Quy_tac_viet_20_cua_so_La_Ma_la_gi\" >Quy t\u1eafc vi\u1ebft 20 c\u1ee7a s\u1ed1 La M\u00e3 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-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Cac_loai_bai_tap_tren_so_20_la_pho_bien_trong_bai_kiem_tra\" >C\u00e1c lo\u1ea1i b\u00e0i t\u1eadp tr\u00ean s\u1ed1 20 l\u00e0 ph\u1ed5 bi\u1ebfn trong b\u00e0i ki\u1ec3m tra<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Mau_1_Them_phep_tru_so_20_voi_cac_chu_so_khac\" >M\u1eabu 1: Th\u00eam ph\u00e9p tr\u1eeb s\u1ed1 20 v\u1edbi c\u00e1c ch\u1eef s\u1ed1 kh\u00e1c<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Mau_2_Xac_dinh_so_20_La_Ma_trong_mot_chuoi_nhat_dinh\" >M\u1eabu 2: X\u00e1c \u0111\u1ecbnh s\u1ed1 20 La M\u00e3 trong m\u1ed9t chu\u1ed7i nh\u1ea5t \u0111\u1ecbnh<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Mau_3_So_sanh_so_20_va_cac_so_La_Ma_khac_trong_chu_de\" >M\u1eabu 3: So s\u00e1nh s\u1ed1 20 v\u00e0 c\u00e1c s\u1ed1 La M\u00e3 kh\u00e1c trong ch\u1ee7 \u0111\u1ec1<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Mau_4_Doc_va_viet_so_20_bang_Roman\" >M\u1eabu 4: \u0110\u1ecdc v\u00e0 vi\u1ebft s\u1ed1 20 b\u1eb1ng Roman<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Tom_tat_mot_so_bai_tap_ve_so_20_de_thuc_hanh_em_be\" >T\u00f3m t\u1eaft m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 s\u1ed1 20 \u0111\u1ec3 th\u1ef1c h\u00e0nh em b\u00e9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bai_tap_1\" >B\u00e0i t\u1eadp 1<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bai_tap_2\" >B\u00e0i t\u1eadp 2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bai_tap_3\" >B\u00e0i t\u1eadp 3<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bai_tap_4\" >B\u00e0i t\u1eadp 4<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bai_tap_5\" >B\u00e0i t\u1eadp 5<\/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\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bai_tap_6\" >B\u00e0i t\u1eadp 6<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.ckconitsha.com\/vn\/tuyet-chieu-giup-be-hoc-va-ghi-nho-so-20-la-ma-cuc-chuan\/#Bi_quyet_de_giup_be_ghi_nho_so_20_tac_pham_La_Ma\" >B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap b\u00e9 ghi nh\u1edb s\u1ed1 20 t\u00e1c ph\u1ea9m La M\u00e3<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>S\u1ed1 20 La M\u00e3 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 vi\u1ebft v\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc ch\u00ednh x\u00e1c? L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 gi\u00fap tr\u1ebb nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3? H\u00e3y \u0111\u1ec3 kh\u1ec9 gi\u00fap cha m\u1eb9 c\u00e1ch h\u1ed7 tr\u1ee3 con c\u00e1i c\u1ee7a h\u1ecd h\u1ecdc t\u1ed1t v\u1ec1 s\u1ed1 20 c\u1ee7a s\u1ed1 La M\u00e3 hi\u1ec7u qu\u1ea3 h\u01a1n trong b\u00e0i vi\u1ebft sau.<\/p>\n<p>                                                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img_default\/monkey3.png\" alt=\"\"><\/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 \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_de_doc_so_20_La_Ma_nhu_the_nao\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc s\u1ed1 20 La M\u00e3 nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">S\u1ed1 20 l\u00e0 m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng \u0111\u1eb7c bi\u1ec7t ch\u1ec9 h\u00e0ng t\u00e1 v\u00e0 s\u1ed1 l\u01b0\u1ee3ng \u0111\u01a1n v\u1ecb c\u00f3 gi\u00e1 tr\u1ecb cho s\u1ed1 0. V\u00ec v\u1eady, khi \u0111\u1ecdc s\u1ed1 20 ng\u01b0\u1eddi n\u00e0y s\u1ebd \u0111\u1ecdc gi\u1ed1ng nh\u01b0 \u0111\u1ecdc s\u1ed1 20 trong chu\u1ed7i s\u1ed1 t\u1ef1 nhi\u00ean.<\/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\/1-so-20-la-ma.jpg\" alt=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc R\u00f4 -ma 20 Th\u00edch? (Ngu\u1ed3n h\u00ecnh \u1ea3nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Theo \u0111\u00f3, m\u1ecdi ng\u01b0\u1eddi s\u1ebd d\u1ef1a v\u00e0o c\u00e1c nh\u00e2n v\u1eadt v\u00e0 c\u00e1c ch\u1eef s\u1ed1 xu\u1ea5t hi\u1ec7n trong c\u1ea5u tr\u00fac c\u1ee7a s\u1ed1 20 \u0111\u1ec3 \u0111\u1ecdc. \u0110\u00f3 l\u00e0 X &#8211; c\u00f3 gi\u00e1 tr\u1ecb 10 khi xu\u1ea5t hi\u1ec7n hai l\u1ea7n s\u1ebd c\u00f3 gi\u00e1 tr\u1ecb 20. V\u00ec v\u1eady, s\u1ed1 20 s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecdc l\u00e0 &#8220;hai m\u01b0\u01a1i&#8221;. C\u00e1ch \u0111\u1ecdc s\u1ed1 20 n\u00e0y r\u1ea5t \u0111\u01a1n gi\u1ea3n, kh\u00f4ng m\u1ea5t nhi\u1ec1u th\u1eddi gian, v\u00ec v\u1eady tr\u1ebb em r\u1ea5t d\u1ec5 h\u1ecdc.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Quy_tac_viet_20_cua_so_La_Ma_la_gi\"><\/span>Quy t\u1eafc vi\u1ebft 20 c\u1ee7a s\u1ed1 La M\u00e3 l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Kh\u00f4ng ch\u1ec9 \u0111\u1ecdc \u0111\u01a1n gi\u1ea3n, m\u00e0 s\u1ed1 20 c\u0169ng c\u00f3 m\u1ed9t quy t\u1eafc vi\u1ebft r\u1ea5t ng\u1eafn. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c h\u1ecdc s\u1ed1 20 l\u00e0 m\u00e3 c\u1ef1c k\u1ef3 \u0111\u01a1n gi\u1ea3n. B\u1ea1n ch\u1ec9 c\u1ea7n nh\u1edb c\u00e1c quy t\u1eafc khi vi\u1ebft nh\u01b0 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\/2-so-20-la-ma.jpg\" alt=\"Vi\u1ebft s\u1ed1 20 La M\u00e3 th\u00edch? (Ngu\u1ed3n h\u00ecnh \u1ea3nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">X l\u00e0 ch\u1eef s\u1ed1 hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb c\u1ee7a 10, c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n nhi\u1ec1u l\u1ea7n nh\u01b0ng kh\u00f4ng xu\u1ea5t hi\u1ec7n nhi\u1ec1u h\u01a1n ba l\u1ea7n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">X tr\u00ean 20 l\u1eb7p l\u1ea1i hai l\u1ea7n hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb 2 x 10 = 20<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 20 kh\u00f4ng c\u00f3 b\u1eb1ng kh\u00f4ng<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_loai_bai_tap_tren_so_20_la_pho_bien_trong_bai_kiem_tra\"><\/span>C\u00e1c lo\u1ea1i b\u00e0i t\u1eadp tr\u00ean s\u1ed1 20 l\u00e0 ph\u1ed5 bi\u1ebfn trong b\u00e0i ki\u1ec3m tra<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00e1c b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn s\u1ed1 20 c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong b\u00e0i ki\u1ec3m tra ho\u1eb7c th\u1eed nghi\u1ec7m r\u1ea5t \u0111a d\u1ea1ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp m\u00e0 cha m\u1eb9 n\u00ean d\u00e0nh th\u1eddi gian \u0111\u1ec3 h\u1ecdc v\u00e0 h\u01b0\u1edbng d\u1eabn con c\u00e1i l\u00e0m quen.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Them_phep_tru_so_20_voi_cac_chu_so_khac\"><\/span>M\u1eabu 1: Th\u00eam ph\u00e9p tr\u1eeb s\u1ed1 20 v\u1edbi c\u00e1c ch\u1eef s\u1ed1 kh\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">M\u1ed9t trong nh\u1eefng lo\u1ea1i b\u00e0i t\u1eadp xu\u1ea5t hi\u1ec7n trong h\u1ea7u h\u1ebft c\u00e1c c\u00e2u h\u1ecfi v\u00e0 b\u00e0i ki\u1ec3m tra l\u00e0 tr\u1eeb \u0111i s\u1ed1 20 v\u1edbi c\u00e1c s\u1ed1 La M\u00e3 kh\u00e1c. Qu\u00e1 tr\u00ecnh th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp n\u00e0y l\u00e0:<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/3-so-20-la-ma.jpg\" alt=\"H\u00ecnh th\u1ee9c b\u00e0i t\u1eadp tr\u1eeb s\u1ed1 20 La M\u00e3 (Ngu\u1ed3n: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ea7u ti\u00ean, tr\u1ebb em s\u1ebd chuy\u1ec3n \u0111\u1ed5i s\u1ed1 La M\u00e3 trong v\u1ea5n \u0111\u1ec1 th\u00e0nh s\u1ed1 t\u1ef1 nhi\u00ean<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ti\u1ebfp theo, tr\u1ebb em s\u1ebd th\u1ef1c hi\u1ec7n vi\u1ec7c b\u1ed5 sung v\u00e0 tr\u1eeb c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Khi k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1, tr\u1ebb em s\u1ebd thay \u0111\u1ed5i t\u1eeb s\u1ed1 t\u1ef1 nhi\u00ean th\u00e0nh s\u1ed1 La M\u00e3 v\u00e0 vi\u1ebft trong b\u00e0i ki\u1ec3m tra.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">V\u00ed d\u1ee5: <em>T\u00ednh to\u00e1n xx &#8211; xix<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Xac_dinh_so_20_La_Ma_trong_mot_chuoi_nhat_dinh\"><\/span>M\u1eabu 2: X\u00e1c \u0111\u1ecbnh s\u1ed1 20 La M\u00e3 trong m\u1ed9t chu\u1ed7i nh\u1ea5t \u0111\u1ecbnh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Lo\u1ea1i b\u00e0i t\u1eadp ti\u1ebfp theo m\u00e0 b\u1ea1n c\u1ea7n n\u1eafm b\u1eaft l\u00e0 x\u00e1c \u0111\u1ecbnh s\u1ed1 20 La M\u00e3 xu\u1ea5t hi\u1ec7n trong chu\u1ed7i c\u00e1c s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u01b0a ra. B\u00e0i t\u1eadp n\u00e0y \u0111\u00f2i h\u1ecfi tr\u1ebb ph\u1ea3i nh\u1edb s\u1ed1 20 c\u00e1ch vi\u1ebft. Sau \u0111\u00f3, nh\u1eefng \u0111\u1ee9a tr\u1ebb m\u1edbi c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u nh\u1eefng g\u00ec l\u00e0 20. <\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5: <em>T\u00ecm s\u1ed1 20 trong chu\u1ed7i sau: XX, XIX, VII, XIV, IX<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_So_sanh_so_20_va_cac_so_La_Ma_khac_trong_chu_de\"><\/span>M\u1eabu 3: So s\u00e1nh s\u1ed1 20 v\u00e0 c\u00e1c s\u1ed1 La M\u00e3 kh\u00e1c trong ch\u1ee7 \u0111\u1ec1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 tr\u1ebb em x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed s\u1ed1 20, gi\u00e1 tr\u1ecb n\u00e0o trong chu\u1ed7i La M\u00e3, m\u1ed9t h\u00ecnh th\u1ee9c b\u00e0i t\u1eadp kh\u00e1 ph\u1ed5 bi\u1ebfn trong c\u00e1c b\u00e0i ki\u1ec3m tra l\u00e0 so s\u00e1nh v\u1edbi s\u1ed1 20 c\u1ee7a c\u00e1c s\u1ed1 La M\u00e3 v\u1edbi c\u00e1c s\u1ed1 kh\u00e1c. <\/p>\n<p dir=\"ltr\">\u0110\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp so s\u00e1nh, b\u1ea1n c\u1ea7n x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng La M\u00e3 tr\u01b0\u1edbc khi c\u00f3 th\u1ec3 so s\u00e1nh. <\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/4-so-20-la-ma.jpg\" alt=\"B\u00e0i t\u1eadp so s\u00e1nh s\u1ed1 20 La M\u00e3 (Ngu\u1ed3n: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5: <em>So s\u00e1nh XX v\u00e0 XXIII<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_4_Doc_va_viet_so_20_bang_Roman\"><\/span>M\u1eabu 4: \u0110\u1ecdc v\u00e0 vi\u1ebft s\u1ed1 20 b\u1eb1ng Roman<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i t\u1eadp \u0111\u1ecdc v\u00e0 vi\u1ebft La M\u00e3 La M\u00e3 l\u00e0 m\u1ed9t b\u00e0i t\u1eadp c\u01a1 b\u1ea3n r\u1ea5t quen thu\u1ed9c. Th\u00f4ng qua lo\u1ea1i b\u00e0i t\u1eadp n\u00e0y, tr\u1ebb em s\u1ebd &#8220;x\u00e1c \u0111\u1ecbnh&#8221; s\u1ed1 20 La M\u00e3.<\/p>\n<p dir=\"ltr\">\u0110\u00e2y c\u0169ng l\u00e0 ti\u1ec1n \u0111\u1ec1 \u0111\u1ec3 gi\u00fap tr\u1ebb th\u1ef1c hi\u1ec7n c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp kh\u00e1c hi\u1ec7u qu\u1ea3 h\u01a1n. V\u00ed d\u1ee5: v\u1ea5n \u0111\u1ec1 c\u00f3 th\u1ec3 y\u00eau c\u1ea7u con b\u1ea1n vi\u1ebft \u0111\u00fang s\u1ed1 20.<\/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\">X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u1eefng ch\u1eafc cho tr\u1ebb em t\u1eeb khi c\u00f2n nh\u1ecf v\u1edbi \u0111a ph\u01b0\u01a1ng ti\u1ec7n, c\u1ef1c k\u1ef3 r\u1ebb c\u00f3 gi\u00e1 d\u01b0\u1edbi 2k\/ng\u00e0y v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9.<\/p>\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=\"Tom_tat_mot_so_bai_tap_ve_so_20_de_thuc_hanh_em_be\"><\/span>T\u00f3m t\u1eaft m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 s\u1ed1 20 \u0111\u1ec3 th\u1ef1c h\u00e0nh em b\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">V\u1edbi c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp tr\u00ean, cha m\u1eb9 c\u00f3 th\u1ec3 \u0111\u00e0o t\u1ea1o con c\u00e1i c\u1ee7a h\u1ecd \u0111\u1ec3 th\u1ef1c h\u00e0nh m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp c\u1ee5 th\u1ec3 sau \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\/5-so-20-la-ma.jpg\" alt=\"T\u1eadp th\u1ec3 d\u1ee5c tr\u00ean s\u1ed1 XX cho tr\u1ebb em m\u1ed7i ng\u00e0y (Ngu\u1ed3n h\u00ecnh \u1ea3nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_1\"><\/span>B\u00e0i t\u1eadp 1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>T\u00ednh to\u00e1n:<\/em><\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX + VIII<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XIX + XX<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX + IX<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX + VIII<\/em><\/p>\n<\/li>\n<\/ol>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_2\"><\/span>B\u00e0i t\u1eadp 2<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>T\u00ednh to\u00e1n:<\/em><\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>Xx &#8211; vi<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>C &#8211; xx<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>Li &#8211; xx<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX &#8211; IX<\/em><\/p>\n<\/li>\n<\/ol>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_3\"><\/span>B\u00e0i t\u1eadp 3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>T\u00ednh to\u00e1n:<\/em><\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX + CV<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>M &#8211; xx<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX + XVI<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX &#8211; III<\/em><\/p>\n<\/li>\n<\/ol>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_4\"><\/span>B\u00e0i t\u1eadp 4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>T\u00ecm s\u1ed1 20 c\u1ee7a c\u00e1c s\u1ed1 La M\u00e3 sau: <\/em><\/p>\n<p dir=\"ltr\"><em>XX, XXIII, XIX, LV, CV, XC<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_5\"><\/span>B\u00e0i t\u1eadp 5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>Th\u1ef1c hi\u1ec7n c\u00e1c so s\u00e1nh sau:<\/em><\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>Xx v\u00e0 m<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XXVIII v\u00e0 XX<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX v\u00e0 IX<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>XX v\u00e0 VIII<\/em><\/p>\n<\/li>\n<\/ol>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_6\"><\/span>B\u00e0i t\u1eadp 6<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>Vi\u1ebft R\u00f4 -ma 20 sau \u0111\u00f3 \u0111\u1ecdc ch\u00ednh x\u00e1c s\u1ed1 La M\u00e3 n\u00e0y.<\/em><\/p>\n<p dir=\"ltr\">Xem th\u00eam: H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch \u0111\u1ecdc v\u00e0 vi\u1ebft s\u1ed1 La M\u00e3 n\u0103m 2001 \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc hi\u1ec7u qu\u1ea3<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_de_giup_be_ghi_nho_so_20_tac_pham_La_Ma\"><\/span>B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap b\u00e9 ghi nh\u1edb s\u1ed1 20 t\u00e1c ph\u1ea9m La M\u00e3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">S\u1ed1 20 La M\u00e3 th\u1ef1c s\u1ef1 d\u1ec5 h\u1ecdc, v\u00ec v\u1eady cha m\u1eb9 kh\u00f4ng c\u1ea7n ph\u1ea3i lo l\u1eafng v\u1ec1 vi\u1ec7c h\u01b0\u1edbng d\u1eabn tr\u1ebb h\u1ecdc v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn con s\u1ed1 n\u00e0y. Tuy nhi\u00ean, \u0111\u1ec3 tr\u1ebb em nghi\u00ean c\u1ee9u nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3, cha m\u1eb9 n\u00ean ch\u00fa \u00fd \u0111\u1ebfn c\u00e1c b\u00ed m\u1eadt 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\/6-so-20-la-ma.jpg\" alt=\"Kinh nghi\u1ec7m tr\u1ea3i nghi\u1ec7m trong LAP (Ngu\u1ed3n h\u00ecnh \u1ea3nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">D\u1ea1y con b\u1ea1n ghi nh\u1edb c\u00e1c quy t\u1eafc vi\u1ebft 20 \u1edf Rome: La M\u00e3 cho La M\u00e3 s\u1ed1 20, \u0111\u1ecdc s\u1ed1 20 \u1edf Rome c\u1ef1c k\u1ef3 \u0111\u01a1n gi\u1ea3n. V\u00ec v\u1eady, cha m\u1eb9 c\u00f3 th\u1ec3 d\u1ea1y con c\u00e1i c\u1ee7a h\u1ecd nh\u1edb quy t\u1eafc n\u00e0y ch\u1ec9 trong m\u1ed9t th\u1eddi gian ng\u1eafn. Khi b\u1ea1n nh\u1edb c\u00e1c quy t\u1eafc vi\u1ebft, em b\u00e9 c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp r\u1ea5t nhanh.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00e3y \u0111\u1ec3 t\u00f4i th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp kho\u1ea3ng 20 th\u01b0\u1eddng xuy\u00ean: M\u1eb7c d\u00f9 s\u1ed1 20 ng\u01b0\u1eddi La M\u00e3 r\u1ea5t \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 nh\u1edb, n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean, nh\u01b0ng tr\u1ebb em c\u00f3 th\u1ec3 b\u1ecb l\u00e3ng qu\u00ean. Theo \u0111\u00f3, cha m\u1eb9 c\u1ea7n ph\u1ea3i \u0111\u1ec3 con c\u00e1i t\u1eadp th\u1ec3 d\u1ee5c v\u1ec1 ch\u1eef s\u1ed1 La M\u00e3 20 m\u1ed7i ng\u00e0y \u0111\u1ec3 h\u1ecd c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 ghi nh\u1edb s\u1ed1 La M\u00e3 l\u00e2u h\u01a1n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Tham gia c\u00f9ng tr\u1ebb em \u0111\u1ec3 tham gia c\u00e1c tr\u00f2 ch\u01a1i v\u1edbi 20 Roman: Cha m\u1eb9 n\u00ean \u0111\u1ec3 con c\u00e1i ch\u01a1i c\u00e1c tr\u00f2 ch\u01a1i th\u00f4ng minh \u0111\u1ec3 nh\u1edb s\u1ed1 20 trong Roman theo c\u00e1ch t\u1ef1 nhi\u00ean nh\u1ea5t. <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Khuy\u1ebfn kh\u00edch em b\u00e9 \u0111\u1eb7t c\u00e2u h\u1ecfi li\u00ean quan \u0111\u1ebfn s\u1ed1 l\u01b0\u1ee3ng Roman XX: \u0110i\u1ec1u r\u1ea5t quan tr\u1ecdng l\u00e0 khuy\u1ebfn kh\u00edch tr\u1ebb em h\u1ecfi s\u1ed1 La M\u00e3. B\u1edfi v\u00ec khi cha m\u1eb9 khuy\u1ebfn kh\u00edch con c\u00e1i \u0111\u1eb7t c\u00e2u h\u1ecfi s\u1ebd k\u00edch th\u00edch suy ngh\u0129 v\u00e0 s\u00e1ng t\u1ea1o c\u1ee7a h\u1ecd v\u1edbi s\u1ed1 h\u1ecdc c\u1ee7a La M\u00e3.<\/p>\n<\/li>\n<\/ul>\n<\/p>\n<p dir=\"ltr\">\u1ede tr\u00ean, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u00e3 chia s\u1ebb chi ti\u1ebft v\u1ec1 s\u1ed1 20 b\u00e0i t\u1eadp La M\u00e3 v\u00e0 li\u00ean quan v\u00e0 s\u1ed1 20 d\u1ec5 h\u1ecdc nh\u1ea5t cho tr\u1ebb em. Hy v\u1ecdng, v\u1edbi nh\u1eefng c\u1ed5 phi\u1ebfu c\u1ee7a Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math, b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n b\u00e0i t\u1eadp d\u1ec5 nh\u1ea5t.<\/p>\n<p>                                    Ngu\u1ed3n tham chi\u1ebfu<\/p>\n<p>20 trong S\u1ed1 La M\u00e3 &#8211; Truy c\u1eadp ng\u00e0y 29 th\u00e1ng 6 n\u0103m 2022<\/p>\n<p>https:\/\/www.cuemath.com\/numbers\/20-roman-numerals\/<\/p>\n<p>20 trong s\u1ed1 La M\u00e3 l\u00e0 g\u00ec? &#8211; Truy c\u1eadp ng\u00e0y 29 th\u00e1ng 6 n\u0103m 2022<\/p>\n<p>http:\/\/www.romannumerals.co\/number-converter\/20-in-roman-numerals\/<\/p>\n<p>Ngu\u1ed3n: <a href=\"http:\/\/www.ckconitsha.com\/vn\/\">http:\/\/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>S\u1ed1 20 La M\u00e3 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 vi\u1ebft v\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc ch\u00ednh x\u00e1c? L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 gi\u00fap tr\u1ebb nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3? H\u00e3y \u0111\u1ec3 kh\u1ec9 gi\u00fap cha m\u1eb9 c\u00e1ch h\u1ed7 tr\u1ee3 con c\u00e1i c\u1ee7a h\u1ecd h\u1ecdc t\u1ed1t v\u1ec1 s\u1ed1 20 c\u1ee7a s\u1ed1 La M\u00e3 hi\u1ec7u qu\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-19357","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/19357","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=19357"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/19357\/revisions"}],"predecessor-version":[{"id":24361,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/19357\/revisions\/24361"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=19357"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=19357"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=19357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}