{"id":20584,"date":"2021-12-17T16:06:31","date_gmt":"2021-12-17T09:06:31","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=20584"},"modified":"2021-12-17T16:06:33","modified_gmt":"2021-12-17T09:06:33","slug":"vecto-trong-khong-gian","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vecto-trong-khong-gian\/","title":{"rendered":"V\u00c9CT\u01a0 TRONG KH\u00d4NG GIAN"},"content":{"rendered":"<h2><strong>A \u2013 L\u00dd THUY\u1ebeT V\u00c0 PH\u01af\u01a0NG PH\u00c1P<\/strong><\/h2>\n<p><strong>1. \u0110\u1ecbnh ngh\u0129a v\u00e0 c\u00e1c ph\u00e9p to\u00e1n <\/strong><\/p>\n<p>\u00b7 \u0110\u1ecbnh ngh\u0129a, t\u00ednh ch\u1ea5t, c\u00e1c ph\u00e9p to\u00e1n v\u1ec1 vect\u01a1 trong kh\u00f4ng gian \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng ho\u00e0n to\u00e0n t\u01b0\u01a1ng t\u1ef1 nh\u01b0 trong m\u1eb7t ph\u1eb3ng.<\/p>\n<p>\u00b7 L\u01b0u \u00fd:<\/p>\n<p>+ <strong>Qui t\u1eafc ba \u0111i\u1ec3m:<\/strong> Cho ba \u0111i\u1ec3m A, B, C b\u1ea5t k\u1ef3, ta c\u00f3: <img decoding=\"async\" width=\"127\" height=\"29\" class=\"wp-image-20585\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-15.png\" alt=\"IMG_256\" \/><\/p>\n<p>+ <strong>Qui t\u1eafc h\u00ecnh b\u00ecnh h\u00e0nh:<\/strong> Cho h\u00ecnh b\u00ecnh h\u00e0nh ABCD, ta c\u00f3: <img decoding=\"async\" width=\"128\" height=\"29\" class=\"wp-image-20586\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-14.png\" alt=\"IMG_257\" \/><\/p>\n<p>+ <strong>Qui t\u1eafc h\u00ecnh h\u1ed9p:<\/strong> Cho h\u00ecnh h\u1ed9p ABCD. A\u00a2B\u00a2C\u00a2D\u00a2, ta c\u00f3: <img decoding=\"async\" width=\"182\" height=\"29\" class=\"wp-image-20587\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-15.png\" alt=\"IMG_258\" \/><\/p>\n<p>+ <strong>H\u00ea th\u1ee9c trung \u0111i\u1ec3m \u0111o\u1ea1n th\u1eb3ng:<\/strong> Cho I l\u00e0 trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n th\u1eb3ng AB, O tu\u1ef3 \u00fd.<\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"29\" class=\"wp-image-20588\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-13.png\" alt=\"IMG_259\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"131\" height=\"29\" class=\"wp-image-20589\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-15.png\" alt=\"IMG_260\" \/><\/p>\n<p>+ <strong>H\u1ec7 th\u1ee9c tr\u1ecdng t\u00e2m tam gi\u00e1c:<\/strong> Cho G l\u00e0 tr\u1ecdng t\u00e2m c\u1ee7a tam gi\u00e1c ABC, O tu\u1ef3 \u00fd. Ta c\u00f3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"362\" height=\"32\" class=\"wp-image-20590\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-12.png\" alt=\"IMG_261\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_261-12.png 362w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_261-12-300x27.png 300w\" sizes=\"(max-width: 362px) 100vw, 362px\" \/><\/p>\n<p>+ <strong>H\u1ec7 th\u1ee9c tr\u1ecdng t\u00e2m t\u1ee9 di\u1ec7n:<\/strong> Cho G l\u00e0 tr\u1ecdng t\u00e2m c\u1ee7a t\u1ee9 di\u1ec7n ABCD, O tu\u1ef3 \u00fd. Ta c\u00f3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"470\" height=\"32\" class=\"wp-image-20591\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-13.png\" alt=\"IMG_262\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_262-13.png 470w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_262-13-300x20.png 300w\" sizes=\"(max-width: 470px) 100vw, 470px\" \/><\/p>\n<p>+ <strong>\u0110i\u1ec1u ki\u1ec7n hai vect\u01a1 c\u00f9ng ph\u01b0\u01a1ng:<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"32\" class=\"wp-image-20592\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-14.png\" alt=\"IMG_263\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_263-14.png 387w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_263-14-300x25.png 300w\" sizes=\"(max-width: 387px) 100vw, 387px\" \/><\/p>\n<p>+ \u0110i\u1ec3m M chia \u0111o\u1ea1n th\u1eb3ng AB theo t\u1ec9 s\u1ed1 k (k \u00b9 1), O tu\u1ef3 \u00fd. Ta c\u00f3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"265\" height=\"57\" class=\"wp-image-20593\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-13.png\" alt=\"IMG_264\" \/><\/p>\n<p><strong>2. S\u1ef1 \u0111\u1ed3ng ph\u1eb3ng c\u1ee7a ba vect\u01a1<\/strong><\/p>\n<p>\u00b7 Ba vect\u01a1 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u1ed3ng ph\u1eb3ng n\u1ebfu c\u00e1c gi\u00e1 c\u1ee7a ch\u00fang c\u00f9ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng.<\/p>\n<p>\u00b7 <strong>\u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 ba vect\u01a1 \u0111\u1ed3ng ph\u1eb3ng:<\/strong> Cho ba vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"32\" class=\"wp-image-20594\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-13.png\" alt=\"IMG_265\" \/> , trong \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"32\" class=\"wp-image-20595\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-13.png\" alt=\"IMG_266\" \/> kh\u00f4ng c\u00f9ng ph\u01b0\u01a1ng. Khi \u0111\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"32\" class=\"wp-image-20596\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-14.png\" alt=\"IMG_267\" \/> \u0111\u1ed3ng ph\u1eb3ng \u00db $! m, n \u00ce R: <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"29\" class=\"wp-image-20597\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-14.png\" alt=\"IMG_268\" \/><\/p>\n<p>\u00b7 Cho ba vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"32\" class=\"wp-image-20598\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-14.png\" alt=\"IMG_269\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng, <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-20599\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-12.png\" alt=\"IMG_270\" \/> tu\u1ef3 \u00fd.<\/p>\n<p>Khi \u0111\u00f3: $! m, n, p \u00ce R: <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"32\" class=\"wp-image-20600\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-14.png\" alt=\"IMG_271\" \/><\/p>\n<p><strong>3. T\u00edch v\u00f4 h\u01b0\u1edbng c\u1ee7a hai vect\u01a1<\/strong><\/p>\n<p>\u00b7<strong> G\u00f3c gi\u1eefa hai vect\u01a1 trong kh\u00f4ng gian:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"414\" height=\"34\" class=\"wp-image-20601\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-14.png\" alt=\"IMG_272\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_272-14.png 414w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_272-14-300x25.png 300w\" sizes=\"(max-width: 414px) 100vw, 414px\" \/><\/p>\n<p>\u00b7 <strong>T\u00edch v\u00f4 h\u01b0\u1edbng c\u1ee7a hai vect\u01a1 trong kh\u00f4ng gian:<\/strong><\/p>\n<p>+ Cho <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"32\" class=\"wp-image-20602\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-13.png\" alt=\"IMG_273\" \/> . Khi \u0111\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"170\" height=\"30\" class=\"wp-image-20603\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-14.png\" alt=\"IMG_274\" \/><\/p>\n<p>+ V\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"32\" class=\"wp-image-20604\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-13.png\" alt=\"IMG_275\" \/> . Qui \u01b0\u1edbc: <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-20605\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-14.png\" alt=\"IMG_276\" \/><\/p>\n<p>+ <img loading=\"lazy\" decoding=\"async\" width=\"136\" height=\"24\" class=\"wp-image-20606\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-14.png\" alt=\"IMG_277\" \/><\/p>\n<p><strong>4. C\u00e1c d\u1ea1ng to\u00e1n th\u01b0\u1eddng g\u1eb7p:<\/strong><\/p>\n<p><strong>a) Ch\u1ee9ng minh \u0111\u1eb3ng th\u1ee9c vec t\u01a1.<\/strong><\/p>\n<p><strong>b) Ch\u1ee9ng minh ba vec t\u01a1 \u0111\u1ed3ng ph\u1eb3ng v\u00e0 b\u1ed1n \u0111i\u1ec3m \u0111\u1ed3ng ph\u1eb3ng, ph\u00e2n t\u00edch m\u1ed9t vect\u01a1 theo ba vect\u01a1 kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng.<\/strong><\/p>\n<p>+ \u0110\u1ec3 ch\u1ee9ng minh ba vect\u01a1 \u0111\u1ed3ng ph\u1eb3ng, ta c\u00f3 th\u1ec3 ch\u1ee9ng minh b\u1eb1ng m\u1ed9t trong c\u00e1c c\u00e1ch:<\/p>\n<p>&#8211; Ch\u1ee9ng minh c\u00e1c gi\u00e1 c\u1ee7a ba vect\u01a1 c\u00f9ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng.<\/p>\n<p>&#8211; D\u1ef1a v\u00e0o \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 ba vect\u01a1 \u0111\u1ed3ng ph\u1eb3ng: N\u1ebfu c\u00f3 m, n \u00ce R: <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"29\" class=\"wp-image-20607\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-14.png\" alt=\"IMG_278\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"32\" class=\"wp-image-20608\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-12.png\" alt=\"IMG_279\" \/> \u0111\u1ed3ng ph\u1eb3ng<\/p>\n<p>+ \u0110\u1ec3 ph\u00e2n t\u00edch m\u1ed9t vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-20609\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-14.png\" alt=\"IMG_280\" \/> theo ba vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"32\" class=\"wp-image-20610\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-13.png\" alt=\"IMG_281\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng, ta t\u00ecm c\u00e1c s\u1ed1 m, n, p sao cho: <img loading=\"lazy\" decoding=\"async\" width=\"143\" height=\"32\" class=\"wp-image-20611\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-14.png\" alt=\"IMG_282\" \/><\/p>\n<p><strong>c) T\u00ednh t\u00edch v\u00f4 h\u01b0\u1edbng cu\u1ea3 hai v\u00e9c t\u01a1 trong kh\u00f4ng gian <\/strong><\/p>\n<p><strong>d) T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a \u0111o\u1ea1n th\u1eb3ng, v\u00e9ct\u01a1.<\/strong><\/p>\n<p>+ \u0110\u1ec3 t\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t \u0111o\u1ea1n th\u1eb3ng theo ph\u01b0\u01a1ng ph\u00e1p vec t\u01a1 ta s\u1eed d\u1ee5ng c\u01a1 s\u1edf <img loading=\"lazy\" decoding=\"async\" width=\"166\" height=\"52\" class=\"wp-image-20612\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-13.png\" alt=\"IMG_283\" \/> . V\u00ec v\u1eady \u0111\u1ec3 t\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a \u0111o\u1ea1n <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"24\" class=\"wp-image-20613\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-13.png\" alt=\"IMG_284\" \/> ta th\u1ef1c hi\u1ec7n theo c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<p>&#8211; Ch\u1ecdn ba vec t\u01a1 kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"32\" class=\"wp-image-20614\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-14.png\" alt=\"IMG_285\" \/> so cho \u0111\u1ed9 d\u00e0i c\u1ee7a ch\u00fang c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c v\u00e0 g\u00f3c gi\u1eefa ch\u00fang c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c.<\/p>\n<p>&#8211; Ph\u00e2n t\u00edch <img loading=\"lazy\" decoding=\"async\" width=\"164\" height=\"35\" class=\"wp-image-20615\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-13.png\" alt=\"IMG_286\" \/><\/p>\n<p>&#8211; Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"345\" height=\"55\" class=\"wp-image-20616\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-14.png\" alt=\"IMG_287\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_287-14.png 345w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_287-14-300x48.png 300w\" sizes=\"(max-width: 345px) 100vw, 345px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"597\" height=\"55\" class=\"wp-image-20617\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-14.png\" alt=\"IMG_288\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_288-14.png 597w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_288-14-300x28.png 300w\" sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/p>\n<p><strong>e) S\u1eed d\u1ee5ng \u0111i\u1ec1u ki\u1ec7n \u0111\u1ed3ng ph\u1eb3ng c\u1ee7a b\u1ed1n \u0111i\u1ec3m \u0111\u1ec3 gi\u1ea3i b\u00e0i to\u00e1n h\u00ecnh kh\u00f4ng gian.<\/strong><\/p>\n<p>S\u1eed d\u1ee5ng c\u00e1c k\u1ebft qu\u1ea3<\/p>\n<p><em> \u00b7 <\/em> <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"25\" class=\"wp-image-20618\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-15.png\" alt=\"IMG_289\" \/> l\u00e0 b\u1ed1n \u0111i\u1ec3m \u0111\u1ed3ng ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"187\" height=\"30\" class=\"wp-image-20619\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-14.png\" alt=\"IMG_290\" \/><\/p>\n<p><em>\u00b7 <\/em> <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"25\" class=\"wp-image-20620\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-14.png\" alt=\"IMG_291\" \/> l\u00e0 b\u1ed1n \u0111i\u1ec3m \u0111\u1ed3ng ph\u1eb3ng khi v\u00e0 ch\u1ec9 khi v\u1edbi m\u1ecdi \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-20621\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-14.png\" alt=\"IMG_292\" \/> b\u1ea5t k\u00ec ta c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"35\" class=\"wp-image-20622\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-14.png\" alt=\"IMG_293\" \/> trong \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"29\" class=\"wp-image-20623\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-14.png\" alt=\"IMG_294\" \/> .<\/p>\n<h2><strong>B \u2013 B\u00c0I T\u1eacP<\/strong><\/h2>\n<p><strong>C\u00e2u 1:<\/strong> Cho h\u00ecnh l\u0103ng tr\u1ee5 <a id=\"post-20584-MTBlankEqn\"><\/a> <img loading=\"lazy\" decoding=\"async\" width=\"104\" height=\"24\" class=\"wp-image-20624\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-14.png\" alt=\"IMG_295\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"22\" class=\"wp-image-20625\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-14.png\" alt=\"IMG_296\" \/> l\u00e0 trung \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"22\" class=\"wp-image-20626\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-14.png\" alt=\"IMG_297\" \/> . \u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"28\" class=\"wp-image-20627\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-14.png\" alt=\"IMG_298\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"63\" height=\"28\" class=\"wp-image-20628\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-14.png\" alt=\"IMG_299\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"68\" height=\"28\" class=\"wp-image-20629\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-14.png\" alt=\"IMG_300\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"52\" class=\"wp-image-20630\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-14.png\" alt=\"IMG_301\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"52\" class=\"wp-image-20631\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-14.png\" alt=\"IMG_302\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"52\" class=\"wp-image-20632\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-14.png\" alt=\"IMG_303\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"52\" class=\"wp-image-20633\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-14.png\" alt=\"IMG_304\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"168\" class=\"wp-image-20634\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-14.png\" alt=\"IMG_305\" \/><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>Ch\u1ecdn D. <\/strong><\/p>\n<p>Ta ph\u00e2n t\u00edch nh\u01b0 sau:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"289\" height=\"52\" class=\"wp-image-20635\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-14.png\" alt=\"IMG_306\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"229\" height=\"52\" class=\"wp-image-20636\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-14.png\" alt=\"IMG_307\" \/> .<\/p>\n<p><strong>C\u00e2u 2:<\/strong> Trong kh\u00f4ng gian cho \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20637\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-14.png\" alt=\"IMG_308\" \/> v\u00e0 b\u1ed1n \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20638\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-14.png\" alt=\"IMG_309\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20639\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-14.png\" alt=\"IMG_310\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20640\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-13.png\" alt=\"IMG_311\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-20641\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-13.png\" alt=\"IMG_312\" \/> kh\u00f4ng th\u1eb3ng h\u00e0ng. \u0110i\u1ec1u ki\u1ec7n c\u1ea7n v\u00e0 \u0111\u1ee7 \u0111\u1ec3 <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20642\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-13.png\" alt=\"IMG_313\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20643\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-13.png\" alt=\"IMG_314\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20644\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-13.png\" alt=\"IMG_315\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-20645\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-13.png\" alt=\"IMG_316\" \/> t\u1ea1o th\u00e0nh h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"28\" class=\"wp-image-20646\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-13.png\" alt=\"IMG_317\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"177\" height=\"32\" class=\"wp-image-20647\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-13.png\" alt=\"IMG_318\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"52\" class=\"wp-image-20648\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-13.png\" alt=\"IMG_319\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"52\" class=\"wp-image-20649\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-13.png\" alt=\"IMG_320\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"270\" height=\"182\" class=\"wp-image-20650\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-12.png\" alt=\"IMG_321\" \/><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>Ch\u1ecdn B. <\/strong><\/p>\n<p>Tr\u01b0\u1edbc h\u1ebft, \u0111i\u1ec1u ki\u1ec7n c\u1ea7n v\u00e0 \u0111\u1ee7 \u0111\u1ec3 <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-20651\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-12.png\" alt=\"IMG_322\" \/> l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"124\" height=\"29\" class=\"wp-image-20652\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-12.png\" alt=\"IMG_323\" \/> .<\/p>\n<p>V\u1edbi m\u1ecdi \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20653\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-12.png\" alt=\"IMG_324\" \/> b\u1ea5t k\u00ec kh\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20654\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-12.png\" alt=\"IMG_325\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20655\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-12.png\" alt=\"IMG_326\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20656\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-12.png\" alt=\"IMG_327\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-20657\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-11.png\" alt=\"IMG_328\" \/> , ta c\u00f3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"409\" height=\"29\" class=\"wp-image-20658\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-11.png\" alt=\"IMG_329\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_329-11.png 409w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_329-11-300x21.png 300w\" sizes=\"(max-width: 409px) 100vw, 409px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"197\" height=\"29\" class=\"wp-image-20659\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-11.png\" alt=\"IMG_330\" \/> .<\/p>\n<p><strong>C\u00e2u 3:<\/strong> Cho h\u00ecnh ch\u00f3p <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"24\" class=\"wp-image-20660\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-11.png\" alt=\"IMG_331\" \/> c\u00f3 \u0111\u00e1y <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20661\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-11.png\" alt=\"IMG_332\" \/> l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh. \u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"28\" class=\"wp-image-20662\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-11.png\" alt=\"IMG_333\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"28\" class=\"wp-image-20663\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-10.png\" alt=\"IMG_334\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"28\" class=\"wp-image-20664\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-10.png\" alt=\"IMG_335\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"63\" height=\"28\" class=\"wp-image-20665\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-10.png\" alt=\"IMG_336\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"109\" height=\"28\" class=\"wp-image-20666\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-10.png\" alt=\"IMG_337\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"109\" height=\"28\" class=\"wp-image-20667\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-10.png\" alt=\"IMG_338\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"109\" height=\"28\" class=\"wp-image-20668\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-10.png\" alt=\"IMG_339\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"135\" height=\"28\" class=\"wp-image-20669\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-10.png\" alt=\"IMG_340\" \/> .<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"224\" height=\"193\" class=\"wp-image-20670\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-10.png\" alt=\"IMG_341\" \/><strong>Ch\u1ecdn A. <\/strong><\/p>\n<p>G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20671\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-10.png\" alt=\"IMG_342\" \/> l\u00e0 t\u00e2m c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-20672\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-10.png\" alt=\"IMG_343\" \/> . Ta ph\u00e2n t\u00edch nh\u01b0 sau:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"70\" class=\"wp-image-20673\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-10.png\" alt=\"IMG_344\" \/> (do t\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng trung tuy\u1ebfn)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"314\" height=\"29\" class=\"wp-image-20674\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-10.png\" alt=\"IMG_345\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_345-10.png 314w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_345-10-300x28.png 300w\" sizes=\"(max-width: 314px) 100vw, 314px\" \/> .<\/p>\n<p><strong>C\u00e2u 4:<\/strong> Cho t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20675\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-10.png\" alt=\"IMG_346\" \/><em>.<\/em> G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"22\" class=\"wp-image-20676\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-10.png\" alt=\"IMG_347\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20677\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-10.png\" alt=\"IMG_348\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-20678\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-10.png\" alt=\"IMG_349\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-20679\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-10.png\" alt=\"IMG_350\" \/><em>.<\/em> \u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"63\" height=\"32\" class=\"wp-image-20680\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-10.png\" alt=\"IMG_351\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"28\" class=\"wp-image-20681\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-10.png\" alt=\"IMG_352\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"68\" height=\"28\" class=\"wp-image-20682\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-10.png\" alt=\"IMG_353\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"52\" class=\"wp-image-20683\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-10.png\" alt=\"IMG_354\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"52\" class=\"wp-image-20684\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-10.png\" alt=\"IMG_355\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"52\" class=\"wp-image-20685\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-10.png\" alt=\"IMG_356\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"52\" class=\"wp-image-20686\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-10.png\" alt=\"IMG_357\" \/> .<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"246\" height=\"220\" class=\"wp-image-20687\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-10.png\" alt=\"IMG_358\" \/><strong>Ch\u1ecdn A. <\/strong><\/p>\n<p>Ta ph\u00e2n t\u00edch:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"52\" class=\"wp-image-20688\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-10.png\" alt=\"IMG_359\" \/> (t\u00ednh ch\u1ea5t \u0111\u01b0\u1eddng trung tuy\u1ebfn)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"383\" height=\"52\" class=\"wp-image-20689\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-10.png\" alt=\"IMG_360\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_360-10.png 383w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_360-10-300x41.png 300w\" sizes=\"(max-width: 383px) 100vw, 383px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"259\" height=\"52\" class=\"wp-image-20690\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-10.png\" alt=\"IMG_361\" \/> .<\/p>\n<p><strong>C\u00e2u 5:<\/strong> Cho h\u00ecnh h\u1ed9p <img loading=\"lazy\" decoding=\"async\" width=\"135\" height=\"24\" class=\"wp-image-20691\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-10.png\" alt=\"IMG_362\" \/> c\u00f3 t\u00e2m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20692\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-8.png\" alt=\"IMG_363\" \/> . G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-20693\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-10.png\" alt=\"IMG_364\" \/> l\u00e0 t\u00e2m h\u00ecnh b\u00ecnh h\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20694\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-10.png\" alt=\"IMG_365\" \/><strong><em>.<\/em><\/strong> \u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"28\" class=\"wp-image-20695\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-10.png\" alt=\"IMG_366\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"28\" class=\"wp-image-20696\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-10.png\" alt=\"IMG_367\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"28\" class=\"wp-image-20697\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_368-10.png\" alt=\"IMG_368\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"33\" class=\"wp-image-20698\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_369-10.png\" alt=\"IMG_369\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"189\" height=\"52\" class=\"wp-image-20699\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_370-10.png\" alt=\"IMG_370\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"52\" class=\"wp-image-20700\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_371-10.png\" alt=\"IMG_371\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"189\" height=\"52\" class=\"wp-image-20701\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_372-10.png\" alt=\"IMG_372\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"52\" class=\"wp-image-20702\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_373-10.png\" alt=\"IMG_373\" \/> .<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"294\" height=\"200\" class=\"wp-image-20703\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_374-10.png\" alt=\"IMG_374\" \/><strong>Ch\u1ecdn D. <\/strong><\/p>\n<p>Ta ph\u00e2n t\u00edch:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"424\" height=\"40\" class=\"wp-image-20704\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_375-10.png\" alt=\"IMG_375\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_375-10.png 424w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_375-10-300x28.png 300w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"492\" height=\"40\" class=\"wp-image-20705\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_376-9.png\" alt=\"IMG_376\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_376-9.png 492w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_376-9-300x24.png 300w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_376-9-480x40.png 480w\" sizes=\"(max-width: 492px) 100vw, 492px\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"337\" height=\"32\" class=\"wp-image-20706\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_377-8.png\" alt=\"IMG_377\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_377-8.png 337w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_377-8-300x28.png 300w\" sizes=\"(max-width: 337px) 100vw, 337px\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"52\" class=\"wp-image-20707\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_378-7.png\" alt=\"IMG_378\" \/> .<\/p>\n<p><strong>C\u00e2u 6:<\/strong> Cho h\u00ecnh h\u1ed9p <img loading=\"lazy\" decoding=\"async\" width=\"135\" height=\"24\" class=\"wp-image-20708\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_379-7.png\" alt=\"IMG_379\" \/> . G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-20709\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_380-7.png\" alt=\"IMG_380\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-20710\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_381-7.png\" alt=\"IMG_381\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u00e2m c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"22\" class=\"wp-image-20711\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_382-7.png\" alt=\"IMG_382\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"68\" height=\"24\" class=\"wp-image-20712\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_383-7.png\" alt=\"IMG_383\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y <strong>sai<\/strong>?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"164\" height=\"52\" class=\"wp-image-20713\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_384-7.png\" alt=\"IMG_384\" \/> .<\/p>\n<p><strong>B. <\/strong>B\u1ed1n \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-20714\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_385-7.png\" alt=\"IMG_385\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-20715\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_386-7.png\" alt=\"IMG_386\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20716\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_387-6.png\" alt=\"IMG_387\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20717\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_388-4.png\" alt=\"IMG_388\" \/> \u0111\u1ed3ng ph\u1eb3ng.<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"29\" class=\"wp-image-20718\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_389-3.png\" alt=\"IMG_389\" \/> .<\/p>\n<p><strong>D. <\/strong>Ba vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"27\" class=\"wp-image-20719\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_390-4.png\" alt=\"IMG_390\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"27\" class=\"wp-image-20720\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_391-4.png\" alt=\"IMG_391\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"28\" class=\"wp-image-20721\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_392-5.png\" alt=\"IMG_392\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"316\" height=\"204\" class=\"wp-image-20722\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_393-5.png\" alt=\"IMG_393\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_393-5.png 316w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_393-5-300x194.png 300w\" sizes=\"(max-width: 316px) 100vw, 316px\" \/><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>Ch\u1ecdn D. <\/strong><\/p>\n<p><strong>A \u0111\u00fang<\/strong> do t\u00ednh ch\u1ea5t \u0111\u01b0\u1eddng trung b\u00ecnh trong <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20723\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_394-5.png\" alt=\"IMG_394\" \/> v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"24\" class=\"wp-image-20724\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_395-5.png\" alt=\"IMG_395\" \/> .<\/p>\n<p><strong>B \u0111\u00fang<\/strong> do <img loading=\"lazy\" decoding=\"async\" width=\"78\" height=\"24\" class=\"wp-image-20725\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_396-5.png\" alt=\"IMG_396\" \/> n\u00ean b\u1ed1n \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-20726\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_397-5.png\" alt=\"IMG_397\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-20727\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_398-5.png\" alt=\"IMG_398\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-20728\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_399-5.png\" alt=\"IMG_399\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-20729\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_400-5.png\" alt=\"IMG_400\" \/> \u0111\u1ed3ng ph\u1eb3ng.<\/p>\n<p><strong>C \u0111\u00fang<\/strong> do vi\u1ec7c ta ph\u00e2n t\u00edch:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"412\" height=\"29\" class=\"wp-image-20730\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_401-5.png\" alt=\"IMG_401\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_401-5.png 412w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_401-5-300x21.png 300w\" sizes=\"(max-width: 412px) 100vw, 412px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"152\" height=\"29\" class=\"wp-image-20731\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_402-5.png\" alt=\"IMG_402\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_402-5.png 152w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_402-5-150x29.png 150w\" sizes=\"(max-width: 152px) 100vw, 152px\" \/> .<\/p>\n<p><strong>D sai<\/strong> do gi\u00e1 c\u1ee7a ba vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"27\" class=\"wp-image-20732\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_403-5.png\" alt=\"IMG_403\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"27\" class=\"wp-image-20733\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_404-5.png\" alt=\"IMG_404\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"28\" class=\"wp-image-20734\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_405-5.png\" alt=\"IMG_405\" \/> \u0111\u1ec1u song song ho\u1eb7c tr\u00f9ng v\u1edbi m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"34\" class=\"wp-image-20735\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_406-5.png\" alt=\"IMG_406\" \/> . Do \u0111\u00f3, theo \u0111\u1ecbnh ngh\u0129a s\u1ef1 \u0111\u1ed3ng ph\u1eb3ng c\u1ee7a c\u00e1c vect\u01a1, ba vect\u01a1 tr\u00ean \u0111\u1ed3ng ph\u1eb3ng.<\/p>\n<p><strong>C\u00e2u 7:<\/strong> Cho t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20736\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_407-5.png\" alt=\"IMG_407\" \/> . Ng\u01b0\u1eddi ta \u0111\u1ecbnh ngh\u0129a \u201c <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-20737\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_408-5.png\" alt=\"IMG_408\" \/> l\u00e0 tr\u1ecdng t\u00e2m t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20738\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_409-5.png\" alt=\"IMG_409\" \/> khi <img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"28\" class=\"wp-image-20739\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_410-5.png\" alt=\"IMG_410\" \/> \u201d. Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y <strong>sai<\/strong>?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-20740\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_411-5.png\" alt=\"IMG_411\" \/> l\u00e0 trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"24\" class=\"wp-image-20741\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_412-5.png\" alt=\"IMG_412\" \/> ( <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-20742\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_413-5.png\" alt=\"IMG_413\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-20743\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_414-5.png\" alt=\"IMG_414\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-20744\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_415-5.png\" alt=\"IMG_415\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-20745\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_416-5.png\" alt=\"IMG_416\" \/> ).<\/p>\n<p><strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-20746\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_417-5.png\" alt=\"IMG_417\" \/> l\u00e0 trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-20747\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_418-5.png\" alt=\"IMG_418\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-20748\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_419-5.png\" alt=\"IMG_419\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-20749\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_420-5.png\" alt=\"IMG_420\" \/> l\u00e0 trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-20750\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_421-5.png\" alt=\"IMG_421\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-20751\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_422-5.png\" alt=\"IMG_422\" \/> .<\/p>\n<p><strong>D. <\/strong>Ch\u01b0a th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c.<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"279\" height=\"223\" class=\"wp-image-20752\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_423-5.png\" alt=\"IMG_423\" \/><strong>Ch\u1ecdn D. <\/strong><\/p>\n<p>Ta g\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-20753\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_424-5.png\" alt=\"IMG_424\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-20754\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_425-5.png\" alt=\"IMG_425\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-20755\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_426-5.png\" alt=\"IMG_426\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-20756\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_427-5.png\" alt=\"IMG_427\" \/> .<\/p>\n<p>T\u1eeb gi\u1ea3 thi\u1ebft, ta bi\u1ebfn \u0111\u1ed5i nh\u01b0 sau:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"473\" height=\"29\" class=\"wp-image-20757\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_428-5.png\" alt=\"IMG_428\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_428-5.png 473w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_428-5-300x18.png 300w\" sizes=\"(max-width: 473px) 100vw, 473px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"24\" class=\"wp-image-20758\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_429-5.png\" alt=\"IMG_429\" \/> l\u00e0 trung \u0111i\u1ec3m \u0111o\u1ea1n <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"24\" class=\"wp-image-20759\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_430-4.png\" alt=\"IMG_430\" \/> .<\/p>\n<p>B\u1eb1ng vi\u1ec7c ch\u1ee9ng minh t\u01b0\u01a1ng t\u1ef1, ta c\u00f3 th\u1ec3 ch\u1ee9ng minh \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng \u00e1n B v\u00e0 C \u0111\u1ec1u l\u00e0 c\u00e1c ph\u01b0\u01a1ng \u00e1n \u0111\u00fang, do \u0111\u00f3 <strong>ph\u01b0\u01a1ng \u00e1n D sai<\/strong>.<\/p>\n<p><strong>C\u00e2u 8:<\/strong> Cho t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-20760\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_431-4.png\" alt=\"IMG_431\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-20761\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_432-4.png\" alt=\"IMG_432\" \/> l\u00e0 tr\u1ecdng t\u00e2m tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-20762\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_433-4.png\" alt=\"IMG_433\" \/> . \u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"63\" height=\"28\" class=\"wp-image-20763\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_434-4.png\" alt=\"IMG_434\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"68\" height=\"33\" class=\"wp-image-20764\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_435-4.png\" alt=\"IMG_435\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"27\" class=\"wp-image-20765\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_436-4.png\" alt=\"IMG_436\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"154\" height=\"52\" class=\"wp-image-20766\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_437-4.png\" alt=\"IMG_437\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_437-4.png 154w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_437-4-150x52.png 150w\" sizes=\"(max-width: 154px) 100vw, 154px\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"167\" height=\"52\" class=\"wp-image-20767\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_438-4.png\" alt=\"IMG_438\" \/> .<\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"154\" height=\"52\" class=\"wp-image-20768\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_439-4.png\" alt=\"IMG_439\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_439-4.png 154w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_439-4-150x52.png 150w\" sizes=\"(max-width: 154px) 100vw, 154px\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"153\" height=\"52\" class=\"wp-image-20769\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_440-4.png\" alt=\"IMG_440\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_440-4.png 153w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_440-4-150x52.png 150w\" sizes=\"(max-width: 153px) 100vw, 153px\" \/> .<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>Ch\u1ecdn A. <\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"275\" height=\"233\" class=\"wp-image-20770\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_441-4.png\" alt=\"IMG_441\" \/> G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"22\" class=\"wp-image-20771\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_442-4.png\" alt=\"IMG_442\" \/> l\u00e0 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-20772\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_443-4.png\" alt=\"IMG_443\" \/> .<\/p>\n<p>Ta ph\u00e2n t\u00edch:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"413\" height=\"52\" class=\"wp-image-20773\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_444-4.png\" alt=\"IMG_444\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_444-4.png 413w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_444-4-300x38.png 300w\" sizes=\"(max-width: 413px) 100vw, 413px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"537\" height=\"57\" class=\"wp-image-20774\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_445-4.png\" alt=\"IMG_445\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_445-4.png 537w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_445-4-300x32.png 300w\" sizes=\"(max-width: 537px) 100vw, 537px\" \/> .<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A \u2013 L\u00dd THUY\u1ebeT V\u00c0 PH\u01af\u01a0NG PH\u00c1P 1. \u0110\u1ecbnh ngh\u0129a v\u00e0 c\u00e1c ph\u00e9p to\u00e1n \u00b7 \u0110\u1ecbnh ngh\u0129a, t\u00ednh ch\u1ea5t, c\u00e1c ph\u00e9p to\u00e1n v\u1ec1 vect\u01a1 trong kh\u00f4ng gian \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng ho\u00e0n to\u00e0n t\u01b0\u01a1ng t\u1ef1 nh\u01b0 trong m\u1eb7t ph\u1eb3ng. \u00b7 L\u01b0u \u00fd: + Qui t\u1eafc ba \u0111i\u1ec3m: Cho ba \u0111i\u1ec3m A, B, C b\u1ea5t k\u1ef3, ta [&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":[42],"tags":[],"class_list":["post-20584","post","type-post","status-publish","format-standard","hentry","category-toan-lop-11"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/20584","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=20584"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/20584\/revisions"}],"predecessor-version":[{"id":20775,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/20584\/revisions\/20775"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=20584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=20584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=20584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}