{"id":7511,"date":"2021-11-20T13:56:37","date_gmt":"2021-11-20T06:56:37","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=7511"},"modified":"2021-11-20T15:09:08","modified_gmt":"2021-11-20T08:09:08","slug":"vi-sao-trong-ba-so-le-lien-tiep-nhat-dinh-co-hai-so-nguyen-to-cung-nhau","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vi-sao-trong-ba-so-le-lien-tiep-nhat-dinh-co-hai-so-nguyen-to-cung-nhau\/","title":{"rendered":"V\u00ec sao trong ba s\u1ed1 l\u1ebb li\u00ean ti\u1ebfp nh\u1ea5t \u0111\u1ecbnh c\u00f3 hai s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">V\u1edbi hai s\u1ed1 nguy\u00ean b\u1ea5t k\u00ec n\u1ebfu ch\u00fang kh\u00f4ng c\u00f3 \u01b0\u1edbc s\u1ed1 chung n\u00e0o kh\u00e1c ngo\u00e0i s\u1ed1 1, ng\u01b0\u1eddi ta g\u1ecdi ch\u00fang l\u00e0 c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau. N\u1ebfu trong ba s\u1ed1 c\u00f3 hai s\u1ed1 b\u1ea5t k\u00ec nguy\u00ean t\u1ed1 c\u00f9ng nhau th\u00ec ng\u01b0\u1eddi ta g\u1ecdi ch\u00fang l\u00e0 c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau song song hay c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau t\u1eebng \u0111\u00f4i m\u1ed9t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ea1i sao v\u1edbi 3 s\u1ed1 l\u1ebb li\u00ean ti\u1ebfp b\u1ea5t k\u00ec nh\u1ea5t \u0111\u1ecbnh c\u00f3 hai s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u00fang ta \u0111\u00e3 bi\u1ebft s\u1ed1 l\u1ebb l\u00e0 s\u1ed1 kh\u00f4ng chia h\u1ebft cho 2 v\u00ec v\u1eady v\u1edbi s\u1ed1 l\u1ebb ta ch\u1ec9 c\u00f3 \u01b0\u1edbc s\u1ed1 l\u00e0 c\u00e1c s\u1ed1 l\u1ebb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5 s\u1ed1 15 ch\u1ec9 c\u00f3 c\u00e1c \u01b0\u1edbc s\u1ed1 1, 3, 5, 15 l\u00e0 c\u00e1c s\u1ed1 l\u1ebb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu hai s\u1ed1 c\u00f9ng l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a m\u1ed9t s\u1ed1 p th\u00ec hi\u1ec7u c\u1ee7a ch\u00fang c\u0169ng l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a p.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5 100 v\u00e0 15 \u0111\u1ec1u l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 5 th\u00ec hi\u1ec7u s\u1ed1 c\u1ee7a hai s\u1ed1 l\u00e0 85 c\u0169ng l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 5.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb c\u00e1c l\u00ed lu\u1eadn tr\u00ean \u0111\u00e2y ch\u00fang ta c\u00f3 th\u1ec3 gi\u1ea3i \u0111\u00e1p c\u00e2u h\u1ecfi \u201cv\u00ec sao\u201d \u0111\u00e3 \u0111\u1ec1 ra.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gi\u1ea3 s\u1eed ta c\u00f3 3 s\u1ed1 l\u1ebb li\u00ean ti\u1ebfp, ta ch\u1ecdn m\u1ed9t s\u1ed1 l\u00e0 a th\u00ec s\u1ed1 l\u1edbn s\u1ebd l\u00e0 b = a + 2 ho\u1eb7c b = a + 4. N\u1ebfu a v\u00e0 b c\u00f3 \u01b0\u1edbc s\u1ed1 chung l\u00e0 p th\u00ec p ph\u1ea3i l\u00e0 \u01b0\u1edbc s\u1ed1 c\u1ee7a hi\u1ec7u s\u1ed1 b &#8211; a, c\u00f3 ngh\u0129a l\u00e0 p ph\u1ea3i l\u00e0 \u01b0\u1edbc s\u1ed1 c\u1ee7a 2 ho\u1eb7c 4. V\u00ec p = 1 n\u00ean a v\u00e0 b ch\u1ec9 c\u00f3 \u01b0\u1edbc s\u1ed1 chung l\u00e0 1. T\u1eeb \u0111\u00f3 n\u1ebfu a, b l\u00e0 s\u1ed1 l\u1ebb th\u00ec \u01b0\u1edbc s\u1ed1 chung c\u1ee7a ch\u00fang ch\u1ec9 l\u00e0 1. V\u00ec a v\u00e0 b l\u00e0 c\u00e1c s\u1ed1 l\u1ebb n\u00ean ch\u00fang kh\u00f4ng c\u00f3 \u01b0\u1edbc s\u1ed1 chung l\u00e0 s\u1ed1 ch\u1eb5n. Ch\u00fang ta \u0111\u00e3 ch\u1ee9ng minh a v\u00e0 b ch\u1ec9 c\u00f3 \u01b0\u1edbc s\u1ed1 chung l\u00e0 1 n\u00ean a v\u00e0 b ph\u1ea3i l\u00e0 c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau. V\u1edbi ba s\u1ed1 l\u1ebb li\u00ean ti\u1ebfp b\u1ea5t k\u00ec lu\u00f4n c\u00f3 hai s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb kho\u00e1: \u01af\u1edbc s\u1ed1, \u01b0\u1edbc s\u1ed1 chung;S\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>V\u1edbi hai s\u1ed1 nguy\u00ean b\u1ea5t k\u00ec n\u1ebfu ch\u00fang kh\u00f4ng c\u00f3 \u01b0\u1edbc s\u1ed1 chung n\u00e0o kh\u00e1c ngo\u00e0i s\u1ed1 1, ng\u01b0\u1eddi ta g\u1ecdi ch\u00fang l\u00e0 c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau. N\u1ebfu trong ba s\u1ed1 c\u00f3 hai s\u1ed1 b\u1ea5t k\u00ec nguy\u00ean t\u1ed1 c\u00f9ng nhau th\u00ec ng\u01b0\u1eddi ta g\u1ecdi ch\u00fang l\u00e0 c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau song [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,9],"tags":[],"class_list":["post-7511","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7511","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7511"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7511\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}