Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"7301","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7525","mon_id":"1158767","chapter_id":"1159256","post_id":"7301","question":"<p>Cho tam giác ABC có tr\u1ecdng tâm G và M là \u0111i\u1ec3m tùy ý. Kh\u1eb3ng \u0111\u1ecbnh nào sau \u0111ây <strong>sai<\/strong>?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\overrightarrow{AM}+\\overrightarrow{BM}+\\overrightarrow{CM}=3\\overrightarrow{GM}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\overrightarrow{GA}+\\overrightarrow{GB}+\\overrightarrow{GC}=3\\overrightarrow{GM}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\overrightarrow{MA}+\\overrightarrow{MB}+\\overrightarrow{MC}=3\\overrightarrow{MG}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\overrightarrow{GA}+\\overrightarrow{GB}+\\overrightarrow{GC}=\\overrightarrow{0}$<\/span>"],"correct":"2","level":"3","hint":"","answer":"<p>Vì G là tr\u1ecdng tâm c\u1ee7a tam giác ABC và M là \u0111i\u1ec3m tùy ý nên<\/p><p><span class=\"math-tex\">$\\overrightarrow{GA}+\\overrightarrow{GB}+\\overrightarrow{GC}=\\overrightarrow{0}$<\/span> (<strong>D<\/strong> \u0111úng, <span style=\"color:#16a085;\"><strong>B<\/strong> sai<\/span>)<\/p><p>⇔ <span class=\"math-tex\">$\\overrightarrow{MA}-\\overrightarrow{MG}+\\overrightarrow{MB}-\\overrightarrow{MG}+\\overrightarrow{MC}-\\overrightarrow{MG}=\\overrightarrow{0}$<\/span><\/p><p>⇔ <span class=\"math-tex\">$\\overrightarrow{MA}+\\overrightarrow{MB}+\\overrightarrow{MC}=3\\overrightarrow{MG}$<\/span> (<strong>C<\/strong> \u0111úng)<\/p><p>⇔ <span class=\"math-tex\">$\\overrightarrow{AM}+\\overrightarrow{BM}+\\overrightarrow{MC}=3\\overrightarrow{GM}$<\/span> (<strong>A<\/strong> \u0111úng)<\/p><p>Câu <strong>sai <\/strong>là <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$\\overrightarrow{GA}+\\overrightarrow{GB}+\\overrightarrow{GC}=3\\overrightarrow{GM}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-04-14 04:55:24","option_type":"math","len":0},{"id":"7528","mon_id":"1158767","chapter_id":"1159256","post_id":"7301","question":"<p>Cho hình bình hành ABCD có tâm I. Khi \u0111ó vect\u01a1 t\u1ed5ng <span class=\"math-tex\">$\\overrightarrow{AB}+\\overrightarrow{AC}+\\overrightarrow{AD}$<\/span> b\u1eb1ng<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$2\\overrightarrow{AI}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$4\\overrightarrow{IA}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$4\\overrightarrow{AI}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$2\\overrightarrow{IA}$<\/span>"],"correct":"3","level":"3","hint":"","answer":"<p><span class=\"svgedit\"><svg height=\"180\" width=\"340\"> <g><title><\/title><rect fill=\"#fff\" height=\"182\" id=\"canvas_background\" width=\"342\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><g id=\"svg_13\"> <g id=\"svg_6\"> <g id=\"svg_4\"> <path d=\"m21.0925,159.35209l59.4,-131l237.59999,0l-59.4,131l-237.59999,0z\" fill=\"#fff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"79.5\" x2=\"259.5\" y1=\"28.25\" y2=\"160.25\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"22.5\" x2=\"318.5\" y1=\"159.25\" y2=\"28.25\"><\/line> <\/g> <ellipse cx=\"217\" cy=\"72.75\" fill=\"#bf0000\" id=\"svg_5\" rx=\"3\" ry=\"3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\"><\/ellipse> <\/g> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"2.5\" xml:space=\"preserve\" y=\"165.25\">A<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"63.5\" xml:space=\"preserve\" y=\"27.25\">B<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"319.5\" xml:space=\"preserve\" y=\"27.25\">C<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"264.5\" xml:space=\"preserve\" y=\"164.25\">D<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"162.5\" xml:space=\"preserve\" y=\"113.25\">I<\/text> <text fill=\"#000000\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"207.5\" xml:space=\"preserve\" y=\"62.25\">G<\/text> <\/g> <\/g> <\/svg><\/span><\/p><p>G\u1ecdi G là tr\u1ecdng tâm tam giác BCD.<\/p><p>Ta có <span class=\"math-tex\">$\\overrightarrow{AB}+\\overrightarrow{AC}+\\overrightarrow{AD}=3\\overrightarrow{AG}=3.\\dfrac{4}{3}.\\overrightarrow{AI}=4\\overrightarrow{AI}$<\/span> .<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$4\\overrightarrow{AI}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-04-14 05:04:06","option_type":"math","len":0},{"id":"7531","mon_id":"1158767","chapter_id":"1159256","post_id":"7301","question":"<p>G\u1ecdi G là tr\u1ecdng tâm c\u1ee7a tam giác ABC. \u0110\u1eb7t <span class=\"math-tex\">$\\overrightarrow{a}=\\overrightarrow{GA};\\overrightarrow{b}=\\overrightarrow{GC}$<\/span>. \u0110\u1eb3ng th\u1ee9c nào d\u01b0\u1edbi \u0111ây là \u0111úng?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\overrightarrow{CA}=-2\\overrightarrow{a}-\\overrightarrow{b}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\overrightarrow{CA}=2\\overrightarrow{a}+\\overrightarrow{b}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\overrightarrow{CA}=\\dfrac{4}{3}\\overrightarrow{a}+\\dfrac{1}{3}\\overrightarrow{b}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\overrightarrow{CA}=\\dfrac{2}{3}\\overrightarrow{a}-\\dfrac{1}{3}\\overrightarrow{b}$<\/span>"],"correct":"2","level":"3","hint":"","answer":"<p><span class=\"svgedit\"><svg height=\"240\" width=\"350\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"242\" 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\" y=\"-0.5\"><\/image> <\/g> <\/svg><\/span><\/p><p>G\u1ecdi D, E, F l\u1ea7n l\u01b0\u1ee3t là trung \u0111i\u1ec3m c\u1ee7a AB, AC, BC.<\/p><p>Vì G là tr\u1ecdng tâm c\u1ee7a tam giác ABC nên <\/p><p><span class=\"math-tex\">$\\overrightarrow{GA}+\\overrightarrow{GB}+\\overrightarrow{GC}=\\overrightarrow{0}$<\/span><\/p><p>⇔ <span class=\"math-tex\">$-\\overrightarrow{GC}=\\overrightarrow{GA}+\\overrightarrow{GB}=\\overrightarrow{a}+\\overrightarrow{b}$<\/span>.<\/p><p>Ta có <span class=\"math-tex\">$\\overrightarrow{CA}=\\overrightarrow{CG}+\\overrightarrow{GA}=-\\overrightarrow{GC}+\\overrightarrow{GA}=\\overrightarrow{a}+\\overrightarrow{b}+\\overrightarrow{a}=2\\overrightarrow{a}+\\overrightarrow{b}$<\/span>.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$\\overrightarrow{CA}=2\\overrightarrow{a}+\\overrightarrow{b}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-04-14 05:19:55","option_type":"math","len":0}]}