{"id":1336,"date":"2020-11-23T22:17:56","date_gmt":"2020-11-23T15:17:56","guid":{"rendered":"https:\/\/www.truyenthong.edu.vn\/?p=1336"},"modified":"2025-05-20T09:59:31","modified_gmt":"2025-05-20T09:59:31","slug":"cach-viet-cau-hoi-tnkq-tu-bai-toan-tu-luan","status":"publish","type":"post","link":"https:\/\/truyenthong.edu.vn\/sanpham\/2020\/11\/23\/cach-viet-cau-hoi-tnkq-tu-bai-toan-tu-luan\/","title":{"rendered":"C\u00e1ch vi\u1ebft c\u00e2u h\u1ecfi TNKQ t\u1eeb b\u00e0i to\u00e1n t\u1ef1 lu\u1eadn"},"content":{"rendered":"\n<p>Gi\u1ea3 s\u1eed ch\u00fang ta \u0111ang c\u1ea7n vi\u1ebft m\u1ed9t hay nhi\u1ec1u c\u00e2u h\u1ecfi \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng to\u00e1n c\u1ee7a h\u1ecdc sinh trong m\u1ed9t t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 l\u00e0 s\u1eed d\u1ee5ng \u0111\u1ecbnh l\u00fd sin. Trong m\u1ed9t k\u1ef3 thi th\u00f4ng th\u01b0\u1eddng, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m t\u1ed1t b\u1eb1ng c\u00e1ch d\u00f9ng c\u00f4ng c\u1ee5 c\u00e2u h\u1ecfi sau:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.truyenthong.edu.vn\/apps\/giml\/images\/image.php?file=1ziig7Gh84apjC-vMIUu0EJJmUbSDPYUj\" alt=\"\" style=\"aspect-ratio:1.5060975609756098;width:392px;height:auto\"\/><figcaption class=\"wp-element-caption\">C\u00e2u h\u1ecfi nhi\u1ec1u l\u1ef1a ch\u1ecdn<\/figcaption><\/figure>\n<\/div>\n\n\n<!--more-->\n\n\n\n<p>Ta n\u00f3i h\u01b0\u1edbng c\u1ee7a \u0111i\u1ec3m A t\u1eeb B l\u00e0 $\\alpha$ n\u1ebfu g\u00f3c \u0111\u1ecbnh h\u01b0\u1edbng $(\\overrightarrow{BA}, N) = \\alpha$ trong \u0111\u00f3 N l\u00e0 vect\u01a1 \u0111\u01a1n v\u1ecb ch\u1ec9 ph\u01b0\u01a1ng b\u1eafc.<\/p>\n\n\n\n<p>C\u00f3 ba th\u00e0nh ph\u1ed1 <em>A<\/em>, <em>B<\/em>, <em>C<\/em> sao cho <em>A<\/em> c\u00e1ch <em>B<\/em> 18 km v\u1edbi h\u01b0\u1edbng c\u1ee7a <em>A<\/em> t\u1eeb <em>B<\/em> l\u00e0&nbsp; 35<sup>0<\/sup> , h\u01b0\u1edbng c\u1ee7a<em> C<\/em> t\u1eeb <em>B<\/em> l\u00e0 136<sup>0<\/sup>. N\u1ebfu h\u01b0\u1edbng c\u1ee7a <em>A<\/em> t\u1eeb <em>C<\/em> l\u00e0 330<sup>0<\/sup>, t\u00ecm kho\u1ea3ng c\u00e1ch gi\u1eefa <em>B<\/em> v\u00e0 <em>C<\/em>?<\/p>\n\n\n\n<p>Nhi\u1ec7m v\u1ee5 \u0111\u1ea7u ti\u00ean c\u1ee7a HS l\u00e0 s\u1eed d\u1ee5ng c\u00e1c th\u00f4ng tin \u0111\u01b0\u1ee3c vi\u1ebft \u0111\u1ec3 th\u00e0nh l\u1eadp m\u1ed9t m\u00f4 h\u00ecnh to\u00e1n. B\u01b0\u1edbc n\u00e0y li\u00ean quan \u0111\u1ebfn ki\u1ebfn th\u1ee9c v\u00e0 \u00fd ngh\u0129a v\u1ec1 h\u01b0\u1edbng c\u1ee7a m\u1ed9t \u0111i\u1ec3m v\u00e0 kh\u1ea3 n\u0103ng d\u1ef1ng, t\u1ed1i thi\u1ec3u l\u00e0 ph\u00e1t th\u1ea3o \u0111\u01b0\u1ee3c g\u00f3c v\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u00f2i h\u1ecfi. Gi\u1ea3 s\u1eed r\u1eb1ng th\u00ed sinh c\u00f3 ki\u1ebfn th\u1ee9c n\u00e0y v\u00e0 kh\u1ea3 n\u0103ng n\u00e0y em s\u1ebd v\u1ebd m\u1ed9t h\u00ecnh. Sau \u0111\u00f3, em h\u1ecdc sinh ph\u1ea3i nh\u1eadn ra r\u1eb1ng em c\u00f3 \u0111\u1ee7 c\u00e1c th\u00f4ng tin \u0111\u1ec3 gi\u1ea3i tam gi\u00e1c ABC v\u00e0 th\u00f4ng tin em c\u00f3 \u0111\u01b0\u1ee3c l\u00e0 \u0111\u1ecbnh l\u00fd sin l\u00e0 c\u00f4ng c\u1ee5 ph\u00f9 h\u1ee3p \u0111\u1ec3 s\u1eed d\u1ee5ng.  <\/p>\n\n\n\n<p>H\u1ecdc sinh bi\u1ebfn \u0111\u1ed5i c\u00f4ng th\u1ee9c\nn\u00e0y v\u1ec1 d\u1ea1ng th\u00edch h\u1ee3p, t\u00ednh c\u00e1c g\u00f3c c\u1ee7a tam gi\u00e1c v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 ti\u1ebfn h\u00e0nh t\u00ednh\nto\u00e1n theo m\u1ed9t qu\u00e1 tr\u00ecnh m\u00e0 \u1edf \u0111\u00f3 h\u1ecdc sinh s\u1ebd b\u1ed9c l\u1ed9 kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng m\u00e1y t\u00ednh b\u1ecf\nt\u00fai hay l\u00e0 b\u1ea3ng s\u1ed1. \u0110\u01b0\u1ee3c ph\u00e2n t\u00edch theo c\u00e1ch n\u00e0y, ta th\u1ea5y r\u00f5 r\u00e0ng r\u1eb1ng c\u00e2u h\u1ecfi\n\u0111ang c\u1ed1 g\u1eafng \u0111\u1ec3 l\u00e0m nhi\u1ec1u th\u1ee9 c\u00f9ng m\u1ed9t l\u00fac. <\/p>\n\n\n\n<p>N\u1ebfu c\u00e1c em th\u1ea5t b\u1ea1i ngay \u1edf b\u01b0\u1edbc \u0111\u1ea7u, ki\u1ebfn th\u1ee9c v\u1ec1 thu\u1eadt ng\u1eef h\u01b0\u1edbng c\u1ee7a m\u1ed9t \u0111i\u1ec3m t\u1eeb m\u1ed9t \u0111i\u1ec3m, c\u00e2u h\u1ecfi t\u1ef1 lu\u1eadn kh\u00f4ng th\u1ec3 cho ta bi\u1ebft \u0111i\u1ec1u g\u00ec v\u1ec1 kh\u1ea3 n\u0103ng c\u1ee7a th\u00ed sinh v\u1ec1 c\u00e1c kh\u00eda c\u1ea1nh kh\u00e1c c\u1ee7a c\u00e2u h\u1ecfi. Tr\u1eafc nghi\u1ec7m kh\u00e1ch quan cho ch\u00fang ta c\u01a1 h\u1ed9i \u0111\u1ec3 t\u00ecm ra nh\u1eefng ph\u1ea7n n\u00e0o c\u1ee7a c\u00e2u h\u1ecfi th\u00ec h\u1ecdc sinh c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<p>T\u1ea3i file pdf c\u00e1ch vi\u1ebft c\u00e1c c\u00e2u h\u1ecfi TNKQ t\u1eeb b\u00e0i to\u00e1n tr\u00ean: <a href=\"https:\/\/drive.google.com\/file\/d\/1Zrr7XrZ2FkF3HRFDkI59TCvrDkiyYZOb\/view?usp=sharing\">T\u1ea3i v\u1ec1<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gi\u1ea3 s\u1eed ch\u00fang ta \u0111ang c\u1ea7n vi\u1ebft m\u1ed9t hay nhi\u1ec1u c\u00e2u h\u1ecfi \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng to\u00e1n c\u1ee7a h\u1ecdc sinh trong m\u1ed9t t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 l\u00e0 s\u1eed d\u1ee5ng \u0111\u1ecbnh l\u00fd sin. Trong m\u1ed9t k\u1ef3 thi th\u00f4ng th\u01b0\u1eddng, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m t\u1ed1t b\u1eb1ng c\u00e1ch d\u00f9ng c\u00f4ng c\u1ee5 c\u00e2u h\u1ecfi sau:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[46],"class_list":["post-1336","post","type-post","status-publish","format-standard","hentry","category-danh-gia-trong-giao-duc-toan","tag-danh-gia"],"_links":{"self":[{"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/posts\/1336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/comments?post=1336"}],"version-history":[{"count":1,"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/posts\/1336\/revisions"}],"predecessor-version":[{"id":3509,"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/posts\/1336\/revisions\/3509"}],"wp:attachment":[{"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/media?parent=1336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/categories?post=1336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/truyenthong.edu.vn\/sanpham\/wp-json\/wp\/v2\/tags?post=1336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}