+ Quy t\u1eafc ba \u0111i\u1ec3m: \n v\u1edbi m\u1ecdi \u0111i\u1ec3m A, B, C. <\/p>\n\n\n\n
+ a\u2192 + 0\u2192 = a\u2192 <\/p>\n\n\n\n
B\u00e0i 3 (trang 12 SGK H\u00ecnh h\u1ecdc 10):<\/strong> Ch\u1ee9ng minh r\u1eb1ng \u0111\u1ed1i v\u1edbi t\u1ee9 gi\u00e1c ABCD b\u1ea5t k\u1ef3 ta lu\u00f4n c\u00f3:<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\na) Ta c\u00f3:<\/p>\n\n\n\nb) \u00c1p d\u1ee5ng quy t\u1eafc tr\u1eeb hai vec t\u01a1 ta c\u00f3:<\/p>\n\n\n\n<\/ins><\/p>\n\n\n\nKi\u1ebfn th\u1ee9c \u00e1p d\u1ee5ng<\/strong><\/p>\n\n\n\n+ Quy t\u1eafc ba \u0111i\u1ec3m : V\u1edbi A, B, C b\u1ea5t k\u00ec ta c\u00f3 : <\/p>\n\n\n\nB\u00e0i 4 (trang 12 SGK H\u00ecnh h\u1ecdc 10):<\/strong> Cho tam gi\u00e1c ABC. B\u00ean ngo\u00e0i c\u1ee7a tam gi\u00e1c v\u1ebd c\u00e1c h\u00ecnh b\u00ecnh h\u00e0nh: ABIJ, BCPQ, CARS. Ch\u1ee9ng minh r\u1eb1ng \n<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nTa c\u00f3: <\/p>\n\n\n\nAJIB l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh n\u00ean \n<\/p>\n\n\n\nT\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u1eady: <\/p>\n\n\n\nBCPQ l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh n\u00ean \n <\/p>\n\n\n\nCARS l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh n\u00ean \n<\/ins><\/p>\n\n\n\nDo \u0111\u00f3: <\/p>\n\n\n\nKi\u1ebfn th\u1ee9c \u00e1p d\u1ee5ng<\/strong><\/p>\n\n\n\nQuy t\u1eafc ba \u0111i\u1ec3m c\u1ed9ng hai vec t\u01a1<\/p>\n\n\n\nB\u00e0i 5 (trang 12 SGK H\u00ecnh h\u1ecdc 10):<\/strong> Cho tam gi\u00e1c \u0111\u1ec1u ABC c\u1ea1nh b\u1eb1ng a. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c vect\u01a1\n<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nTa c\u00f3:<\/p>\n\n\n\n(Quy t\u1eafc h\u00ecnh b\u00ecnh h\u00e0nh) <\/ins><\/p>\n\n\n\n(Trong \u0111\u00f3 D l\u00e0 \u0111\u1ec9nh c\u00f2n l\u1ea1i c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh ABCD)<\/p>\n\n\n\n+ T\u00ednh BD: <\/p>\n\n\n\n
H\u00ecnh b\u00ecnh h\u00e0nh ABCD c\u00f3 AB = BC = a n\u00ean ABCD l\u00e0 h\u00ecnh thoi. <\/p>\n\n\n\n
\u21d2 AC \u22a5 BD t\u1ea1i O l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AC v\u00e0 BD. <\/p>\n\n\n\nTr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi To\u00e1n 10 H\u00ecnh h\u1ecdc B\u00e0i 2 trang 9: H\u00e3y ki\u1ec3m tra c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a ph\u00e9p c\u1ed9ng tr\u00ean h\u00ecnh 1.8. L\u1eddi gi\u1ea3i Tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi To\u00e1n 10 H\u00ecnh h\u1ecdc B\u00e0i 2 trang 10: V\u1ebd h\u00ecnh b\u00ecnh h\u00e0nh ABCD. H\u00e3y nh\u1eadn x\u00e9t v\u1ec1 \u0111\u1ed9 d\u00e0i v\u00e0 h\u01b0\u1edbng c\u1ee7a hai vect\u01a1 AB\u2192 […]<\/p>\n","protected":false},"author":12,"featured_media":44376,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1633],"tags":[],"yoast_head":"\n
[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1\" \/>\n<meta property=\"og:description\" content=\"Tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi To\u00e1n 10 H\u00ecnh h\u1ecdc B\u00e0i 2 trang 9: H\u00e3y ki\u1ec3m tra c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a ph\u00e9p c\u1ed9ng tr\u00ean h\u00ecnh 1.8. L\u1eddi gi\u1ea3i Tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi To\u00e1n 10 H\u00ecnh h\u1ecdc B\u00e0i 2 trang 10: V\u1ebd h\u00ecnh b\u00ecnh h\u00e0nh ABCD. H\u00e3y nh\u1eadn x\u00e9t v\u1ec1 \u0111\u1ed9 d\u00e0i v\u00e0 h\u01b0\u1edbng c\u1ee7a hai vect\u01a1 AB\u2192 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2019-10-16T15:30:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-10-16T15:31:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2019\/10\/c2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"359\" \/>\n\t<meta property=\"og:image:height\" content=\"238\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n M\u01a1\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n M\u01a1\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/\",\"url\":\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/\",\"name\":\"[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2019-10-16T15:30:56+00:00\",\"dateModified\":\"2019-10-16T15:31:05+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/104e47bfb6189ee6fa1aa67e1f9107a2\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/104e47bfb6189ee6fa1aa67e1f9107a2\",\"name\":\"Nguy\u1ec5n M\u01a1\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/20d6905502209505aa7a21b55419ebe9?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/20d6905502209505aa7a21b55419ebe9?s=96&d=mm&r=g\",\"caption\":\"Nguy\u1ec5n M\u01a1\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/mont\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/giai-toan-10-chuong-1-vecto-bai-2-tong-va-hieu-cua-hai-vecto\/","og_locale":"en_US","og_type":"article","og_title":"[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1","og_description":"Tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi To\u00e1n 10 H\u00ecnh h\u1ecdc B\u00e0i 2 trang 9: H\u00e3y ki\u1ec3m tra c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a ph\u00e9p c\u1ed9ng tr\u00ean h\u00ecnh 1.8. L\u1eddi gi\u1ea3i Tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi To\u00e1n 10 H\u00ecnh h\u1ecdc B\u00e0i 2 trang 10: V\u1ebd h\u00ecnh b\u00ecnh h\u00e0nh ABCD. 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![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/tra-loi-cau-hoi-toan-10-hinh-hoc-bai-2-trang-9-1.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/tra-loi-cau-hoi-toan-10-hinh-hoc-bai-2-trang-9-2.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/tra-loi-cau-hoi-toan-10-hinh-hoc-bai-2-trang-10-1.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/tra-loi-cau-hoi-toan-10-hinh-hoc-bai-2-trang-10-2.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/tra-loi-cau-hoi-toan-10-hinh-hoc-bai-2-trang-11.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-1-trang-12-sgk-hinh-hoc-10-5.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-1-trang-12-sgk-hinh-hoc-10-6.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-1-trang-12-sgk-hinh-hoc-10-7.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-1-trang-12-sgk-hinh-hoc-10-8.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-1-trang-12-sgk-hinh-hoc-10-9.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-1-trang-12-sgk-hinh-hoc-10-10.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-2-trang-12-sgk-hinh-hoc-10-5.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-2-trang-12-sgk-hinh-hoc-10-6.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-2-trang-12-sgk-hinh-hoc-10-7.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-2-trang-12-sgk-hinh-hoc-10-8.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-3-trang-12-sgk-hinh-hoc-10-5.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-3-trang-12-sgk-hinh-hoc-10-6.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-3-trang-12-sgk-hinh-hoc-10-7.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-3-trang-12-sgk-hinh-hoc-10-8.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-5.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-6.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-7.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-8.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-9.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-10.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-4-trang-12-sgk-hinh-hoc-10-11.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-5-trang-12-sgk-hinh-hoc-10-6.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-5-trang-12-sgk-hinh-hoc-10-5.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-5-trang-12-sgk-hinh-hoc-10-7.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-5-trang-12-sgk-hinh-hoc-10-10.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-toan-lop-10\/images\/bai-5-trang-12-sgk-hinh-hoc-10-11.PNG\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"