{"id":22904,"date":"2021-12-17T16:51:34","date_gmt":"2021-12-17T09:51:34","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=22904"},"modified":"2021-12-17T16:51:35","modified_gmt":"2021-12-17T09:51:35","slug":"phep-tinh-tien","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/phep-tinh-tien\/","title":{"rendered":"PH\u00c9P T\u1ecaNH TI\u1ebeN"},"content":{"rendered":"<h2><a id=\"post-22904-_Toc492701526\"><\/a><a id=\"post-22904-_Toc493273876\"><\/a><strong>A \u2013 L\u00dd THUY\u1ebeT T\u00d3M T\u1eaeT<\/strong><\/h2>\n<p><strong>1. \u0110\u1ecbnh ngh\u0129a.<\/strong><\/p>\n<p>Trong m\u1eb7t ph\u1eb3ng cho vect\u01a1 <img decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22905\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-34.png\" alt=\"IMG_256\" \/> . Ph\u00e9p bi\u1ebfn h\u00ecnh bi\u1ebfn m\u1ed7i \u0111i\u1ec3m <img decoding=\"async\" width=\"30\" height=\"21\" class=\"wp-image-22906\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-33.png\" alt=\"IMG_257\" \/> th\u00e0nh \u0111i\u1ec3m <img decoding=\"async\" width=\"33\" height=\"21\" class=\"wp-image-22907\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-34.png\" alt=\"IMG_258\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"30\" class=\"wp-image-22908\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-32.png\" alt=\"IMG_259\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <em>ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <\/em> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22909\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-34.png\" alt=\"IMG_260\" \/> .<\/p>\n<p>Ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22910\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-31.png\" alt=\"IMG_261\" \/> \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"33\" class=\"wp-image-22911\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-32.png\" alt=\"IMG_262\" \/> .<\/p>\n<p>V\u1eady th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"208\" height=\"34\" class=\"wp-image-22912\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-33.png\" alt=\"IMG_263\" \/><\/p>\n<p>Nh\u1eadn x\u00e9t: <img loading=\"lazy\" decoding=\"async\" width=\"101\" height=\"33\" class=\"wp-image-22913\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-32.png\" alt=\"IMG_264\" \/><\/p>\n<p><strong>2. T\u00ednh ch\u1ea5t c\u1ee7a ph\u00e9p t\u1ecbnh ti\u1ebfn.<\/strong><\/p>\n<p>\u2219 B\u1ea3o to\u00e0n kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111i\u1ec3m b\u1ea5t k\u00ec<\/p>\n<p>\u2219 Bi\u1ebfn m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng th\u00e0nh \u0111\u01b0\u1eddng th\u1eb3ng song song ho\u1eb7c tr\u00f9ng v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00e3 cho.<\/p>\n<p>\u2219 Bi\u1ebfn \u0111o\u1ea1n th\u1eb3ng th\u00e0nh \u0111o\u1ea1n th\u1eb3ng b\u1eb1ng n\u00f3.<\/p>\n<p>\u2219 Bi\u1ebfn m\u1ed9t tam gi\u00e1c th\u00e0nh tam gi\u00e1c b\u1eb1ng tam gi\u00e1c \u0111\u00e3 cho.<\/p>\n<p>\u2219 Bi\u1ebfn m\u1ed9t \u0111\u01b0\u1eddng tr\u00f2n th\u00e0nh \u0111\u01b0\u1eddng tr\u00f2n c\u00f3 c\u00f9ng b\u00e1n k\u00ednh.<\/p>\n<p><strong>3. Bi\u1ec3u th\u1ee9c t\u1ecda \u0111\u1ed9 c\u1ee7a ph\u00e9p t\u1ecbnh ti\u1ebfn.<\/strong><\/p>\n<p>Trong m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"30\" class=\"wp-image-22914\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-32.png\" alt=\"IMG_265\" \/> cho \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"33\" class=\"wp-image-22915\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-32.png\" alt=\"IMG_266\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"34\" class=\"wp-image-22916\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-33.png\" alt=\"IMG_267\" \/> .<\/p>\n<p>G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"535\" height=\"62\" class=\"wp-image-22917\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-33.png\" alt=\"IMG_268\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_268-33.png 535w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_268-33-300x35.png 300w\" sizes=\"(max-width: 535px) 100vw, 535px\" \/><\/p>\n<p>H\u1ec7 <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22918\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-33.png\" alt=\"IMG_269\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 bi\u1ec3u th\u1ee9c t\u1ecda \u0111\u1ed9 c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"33\" class=\"wp-image-22919\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-31.png\" alt=\"IMG_270\" \/> .<\/p>\n<h2><strong>B \u2013 B\u00c0I T\u1eacP<\/strong><\/h2>\n<h2><strong>D\u1ea0NG 1: \u00c1P D\u1ee4NG \u0110\u1ecaNH NGH\u0128A V\u00c0 C\u00c1C T\u00cdNH CH\u1ea4T PH\u00c9P T\u1ecaNH TI\u1ebeN<\/strong><\/h2>\n<p><strong>C\u00e2u 1:<\/strong> M\u1ec7nh \u0111\u1ec1 n\u00e0o sau \u0111\u00e2y l\u00e0 <strong>sai ?<\/strong><\/p>\n<p>Trong m\u1eb7t ph\u1eb3ng, ph\u00e9p t\u1ecbnh ti\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"233\" height=\"33\" class=\"wp-image-22920\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-33.png\" alt=\"IMG_271\" \/> ( v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"30\" class=\"wp-image-22921\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-33.png\" alt=\"IMG_272\" \/> ). Khi \u0111\u00f3<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"101\" height=\"30\" class=\"wp-image-22922\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-31.png\" alt=\"IMG_273\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"108\" height=\"30\" class=\"wp-image-22923\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-32.png\" alt=\"IMG_274\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"101\" height=\"30\" class=\"wp-image-22924\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-31.png\" alt=\"IMG_275\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"101\" height=\"26\" class=\"wp-image-22925\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-32.png\" alt=\"IMG_276\" \/><\/p>\n<p><strong>C\u00e2u 2:<\/strong> C\u00f3 bao nhi\u00eau ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng cho tr\u01b0\u1edbc th\u00e0nh ch\u00ednh n\u00f3?<\/p>\n<p><strong>A. <\/strong>Kh\u00f4ng c\u00f3. <strong>B. <\/strong>Ch\u1ec9 c\u00f3 m\u1ed9T <strong>C. <\/strong>Ch\u1ec9 c\u00f3 hai. <strong>D. <\/strong>V\u00f4 s\u1ed1.<\/p>\n<p><strong>C\u00e2u 3:<\/strong> C\u00f3 bao nhi\u00eau ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn m\u1ed9t \u0111\u01b0\u1eddng tr\u00f2n cho tr\u01b0\u1edbc th\u00e0nh ch\u00ednh n\u00f3?<\/p>\n<p><strong>A. <\/strong>Kh\u00f4ng c\u00f3. <strong>B. <\/strong>M\u1ed9t. <strong>C. <\/strong>Hai. <strong>D. <\/strong>V\u00f4 s\u1ed1.<\/p>\n<p><strong>C\u00e2u 4:<\/strong> C\u00f3 bao nhi\u00eau ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn m\u1ed9t h\u00ecnh vu\u00f4ng th\u00e0nh ch\u00ednh n\u00f3?<\/p>\n<p><strong>A. <\/strong>Kh\u00f4ng c\u00f3. <strong>B. <\/strong>M\u1ed9t. <strong>C. <\/strong>B\u1ed1n. <strong>D. <\/strong>V\u00f4 s\u1ed1.<\/p>\n<p><strong>C\u00e2u 5:<\/strong> Gi\u1ea3 s\u1eed qua ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"30\" class=\"wp-image-22926\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-32.png\" alt=\"IMG_277\" \/> , \u0111\u01b0\u1eddng th\u1eb3ng d bi\u1ebfn th\u00e0nh \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22927\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-33.png\" alt=\"IMG_278\" \/> . C\u00e2u n\u00e0o sau \u0111\u00e2y <strong><em>sai<\/em><\/strong>?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22928\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-31.png\" alt=\"IMG_279\" \/> tr\u00f9ng <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22929\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-33.png\" alt=\"IMG_280\" \/> khi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22930\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-32.png\" alt=\"IMG_281\" \/> l\u00e0 vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng c\u1ee7a d.<\/p>\n<p><strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22931\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-33.png\" alt=\"IMG_282\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22932\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-32.png\" alt=\"IMG_283\" \/> khi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22933\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-32.png\" alt=\"IMG_284\" \/> l\u00e0 vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng c\u1ee7a d.<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22934\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-33.png\" alt=\"IMG_285\" \/> song song v\u1edbi d\u2019 khi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22935\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-32.png\" alt=\"IMG_286\" \/> kh\u00f4ng ph\u1ea3i l\u00e0 vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22936\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-33.png\" alt=\"IMG_287\" \/> .<\/p>\n<p><strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22937\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-33.png\" alt=\"IMG_288\" \/> kh\u00f4ng bao gi\u1edd c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22938\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-34.png\" alt=\"IMG_289\" \/> .<\/p>\n<p><strong>C\u00e2u 6:<\/strong> Cho hai \u0111\u01b0\u1eddng th\u1eb3ng song song <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22939\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-33.png\" alt=\"IMG_290\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22940\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-33.png\" alt=\"IMG_291\" \/> . T\u1ea5t c\u1ea3 nh\u1eefng ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22941\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-33.png\" alt=\"IMG_292\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22942\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-33.png\" alt=\"IMG_293\" \/> l\u00e0:<\/p>\n<p><strong>A. <\/strong>C\u00e1c ph\u00e9p t\u1ecbnh ti\u1ebfn theo <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22943\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-32.png\" alt=\"IMG_294\" \/> , v\u1edbi m\u1ecdi vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"30\" class=\"wp-image-22944\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-31.png\" alt=\"IMG_295\" \/> kh\u00f4ng song song v\u1edbi vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng c\u1ee7a d.<\/p>\n<p><strong>B. <\/strong>C\u00e1c ph\u00e9p t\u1ecbnh ti\u1ebfn theo <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22945\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-31.png\" alt=\"IMG_296\" \/> , v\u1edbi m\u1ecdi vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"30\" class=\"wp-image-22946\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-31.png\" alt=\"IMG_297\" \/> vu\u00f4ng g\u00f3c v\u1edbi vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22947\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-31.png\" alt=\"IMG_298\" \/> .<\/p>\n<p><strong>C. <\/strong>C\u00e1c ph\u00e9p t\u1ecbnh ti\u1ebfn theo <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"30\" class=\"wp-image-22948\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-32.png\" alt=\"IMG_299\" \/> , trong \u0111\u00f3 hai \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22949\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-32.png\" alt=\"IMG_300\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"21\" class=\"wp-image-22950\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-32.png\" alt=\"IMG_301\" \/> t\u00f9y \u00fd l\u1ea7n l\u01b0\u1ee3t n\u1eb1m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"26\" class=\"wp-image-22951\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-32.png\" alt=\"IMG_302\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"26\" class=\"wp-image-22952\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-32.png\" alt=\"IMG_303\" \/> .<\/p>\n<p><strong>D. <\/strong>C\u00e1c ph\u00e9p t\u1ecbnh ti\u1ebfn theo <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22953\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-32.png\" alt=\"IMG_304\" \/> , v\u1edbi m\u1ecdi vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"30\" class=\"wp-image-22954\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-32.png\" alt=\"IMG_305\" \/> t\u00f9y \u00fd.<\/p>\n<p><strong>C\u00e2u 7:<\/strong> Cho <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22955\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-32.png\" alt=\"IMG_306\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"30\" class=\"wp-image-22956\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-32.png\" alt=\"IMG_307\" \/> c\u1ed1 \u0111\u1ecbnh. Ph\u00e9p t\u1ecbnh ti\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22957\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-32.png\" alt=\"IMG_308\" \/> bi\u1ebfn \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"21\" class=\"wp-image-22958\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-31.png\" alt=\"IMG_309\" \/> b\u1ea5t k\u1ef3 th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22959\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-32.png\" alt=\"IMG_310\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"108\" height=\"33\" class=\"wp-image-22960\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-31.png\" alt=\"IMG_311\" \/> .<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22961\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-31.png\" alt=\"IMG_312\" \/> l\u00e0 ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22962\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-30.png\" alt=\"IMG_313\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22963\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-30.png\" alt=\"IMG_314\" \/> l\u00e0 ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-22964\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-30.png\" alt=\"IMG_315\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22965\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-30.png\" alt=\"IMG_316\" \/> l\u00e0 ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"33\" class=\"wp-image-22966\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-30.png\" alt=\"IMG_317\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22967\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-30.png\" alt=\"IMG_318\" \/> l\u00e0 ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"55\" class=\"wp-image-22968\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-30.png\" alt=\"IMG_319\" \/> .<\/p>\n<p><strong>C\u00e2u 8:<\/strong> Cho ph\u00e9p t\u1ecbnh ti\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"21\" height=\"33\" class=\"wp-image-22969\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-30.png\" alt=\"IMG_320\" \/> bi\u1ebfn \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"21\" class=\"wp-image-22970\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-29.png\" alt=\"IMG_321\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22971\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-29.png\" alt=\"IMG_322\" \/> v\u00e0 ph\u00e9p t\u1ecbnh ti\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"33\" class=\"wp-image-22972\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-27.png\" alt=\"IMG_323\" \/> bi\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22973\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-27.png\" alt=\"IMG_324\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22974\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-27.png\" alt=\"IMG_325\" \/> .<\/p>\n<p><strong>A. <\/strong>Ph\u00e9p t\u1ecbnh ti\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"33\" class=\"wp-image-22975\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-27.png\" alt=\"IMG_326\" \/> bi\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22976\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-27.png\" alt=\"IMG_327\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22977\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-26.png\" alt=\"IMG_328\" \/> .<\/p>\n<p><strong>B. <\/strong>M\u1ed9t ph\u00e9p \u0111\u1ed1i x\u1ee9ng tr\u1ee5c bi\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"21\" class=\"wp-image-22978\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-26.png\" alt=\"IMG_329\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22979\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-26.png\" alt=\"IMG_330\" \/> .<\/p>\n<p><strong>C. <\/strong>Kh\u00f4ng th\u1ec3 kh\u1eb3ng \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00f3 hay kh\u00f4ng m\u1ed9t ph\u00e9p d\u1eddi h\u00ecnh bi\u1ebfn M th\u00e0nh M<sub>2.<\/sub><\/p>\n<p><strong>D. <\/strong>Ph\u00e9p t\u1ecbnh ti\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"33\" class=\"wp-image-22980\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-26.png\" alt=\"IMG_331\" \/> bi\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"21\" class=\"wp-image-22981\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-26.png\" alt=\"IMG_332\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"33\" class=\"wp-image-22982\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-26.png\" alt=\"IMG_333\" \/> .<\/p>\n<p><strong>C\u00e2u 9:<\/strong> Cho ph\u00e9p t\u1ecbnh ti\u1ebfn vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"30\" class=\"wp-image-22983\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-25.png\" alt=\"IMG_334\" \/> bi\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-22984\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-25.png\" alt=\"IMG_335\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"21\" class=\"wp-image-22985\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-25.png\" alt=\"IMG_336\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"21\" class=\"wp-image-22986\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-25.png\" alt=\"IMG_337\" \/> th\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"21\" class=\"wp-image-22987\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-25.png\" alt=\"IMG_338\" \/> . Khi \u0111\u00f3:<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"30\" class=\"wp-image-22988\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-24.png\" alt=\"IMG_339\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"116\" height=\"30\" class=\"wp-image-22989\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-24.png\" alt=\"IMG_340\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"108\" height=\"30\" class=\"wp-image-22990\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-24.png\" alt=\"IMG_341\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"30\" class=\"wp-image-22991\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-24.png\" alt=\"IMG_342\" \/> .<\/p>\n<p><strong>C\u00e2u 10:<\/strong> T\u00ecm m\u1ec7nh \u0111\u1ec1 <strong><em>sai<\/em><\/strong> trong c\u00e1c m\u1ec7nh \u0111\u1ec1 sau:<\/p>\n<p><strong>A. <\/strong>Ph\u00e9p t\u1ecbnh ti\u1ebfn b\u1ea3o to\u00e0n kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111i\u1ec3m b\u1ea5t k\u00ec.<\/p>\n<p><strong>B. <\/strong>Ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn ba \u0111i\u1ec3m th\u1eb3ng h\u00e0ng th\u00e0nh ba \u0111i\u1ec3m th\u1eb3ng h\u00e0ng.<\/p>\n<p><strong>C. <\/strong>Ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn tam gi\u00e1c th\u00e0nh tam gi\u00e1c b\u1eb1ng tam gi\u00e1c \u0111\u00e3 cho.<\/p>\n<p><strong>D. <\/strong>Ph\u00e9p t\u1ecbnh ti\u1ebfn bi\u1ebfn \u0111\u01b0\u1eddng th\u1eb3ng th\u00e0nh \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00e3 cho.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A \u2013 L\u00dd THUY\u1ebeT T\u00d3M T\u1eaeT 1. \u0110\u1ecbnh ngh\u0129a. Trong m\u1eb7t ph\u1eb3ng cho vect\u01a1 . Ph\u00e9p bi\u1ebfn h\u00ecnh bi\u1ebfn m\u1ed7i \u0111i\u1ec3m th\u00e0nh \u0111i\u1ec3m sao cho \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 . Ph\u00e9p t\u1ecbnh ti\u1ebfn theo vect\u01a1 \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u l\u00e0 . V\u1eady th\u00ec Nh\u1eadn x\u00e9t: 2. T\u00ednh ch\u1ea5t c\u1ee7a ph\u00e9p t\u1ecbnh ti\u1ebfn. [&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":[43],"tags":[],"class_list":["post-22904","post","type-post","status-publish","format-standard","hentry","category-toan-lop-12"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/22904","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=22904"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/22904\/revisions"}],"predecessor-version":[{"id":22992,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/22904\/revisions\/22992"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=22904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=22904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=22904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}