{"common":{"save":0,"post_id":"1000","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1381","post_id":"1000","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["20"],["20"],["110"]]],"list":[{"point":10,"width":50,"type_input":"","ques":"<span class='basic_left'> Cho tam gi\u00e1c ABC c\u00f3 $\\widehat{A} = 70^{o} $, c\u00e1c g\u00f3c $\\widehat{B} $ v\u00e0 $\\widehat{C} $ \u0111\u1ec1u nh\u1ecdn. D\u00f9ng th\u01b0\u1edbc th\u1eb3ng v\u00e0 eke v\u1ebd \u0111o\u1ea1n th\u1eb3ng \u0111i qua B v\u00e0 vu\u00f4ng g\u00f3c v\u1edbi AC t\u1ea1i E, v\u1ebd \u0111o\u1ea1n th\u1eb3ng \u0111i qua C v\u00e0 vu\u00f4ng g\u00f3c v\u1edbi AB t\u1ea1i F. <br\/> a) \u0110o c\u00e1c g\u00f3c: $\\widehat{ABE} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o} \\\\ \\widehat{ACF} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o} $ <br\/> b) G\u1ecdi H l\u00e0 giao \u0111i\u1ec3m c\u1ee7a BE v\u00e0 CF. \u0110o g\u00f3c $\\widehat{EHF} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o}$<\/center>","hint":"","explain":" H\u00ecnh v\u1ebd: <center><img src='img\/H7C12-40.png' \/><\/center> <br\/><br\/><span class='basic_pink'> \u0110o \u0111\u01b0\u1ee3c: $ \\widehat{ABE} = 20^{o} \\\\ \\widehat{ACF} = 20^{o} \\\\ \\widehat{EHF} = 110^{o} $ <\/span><\/span> "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:59"},{"id":"1382","post_id":"1000","mon_id":"0","chapter_id":"0","question":" <span class='basic_left'> Cho $\\widehat{AOB} = 150^{o} $. V\u1ec1 ph\u00eda ngo\u00e0i c\u1ee7a g\u00f3c AOB v\u1ebd hai tia OC v\u00e0 OD theo th\u1ee9 t\u1ef1 vu\u00f4ng g\u00f3c v\u1edbi OA, OB. G\u1ecdi Ox l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c AOB, Oy l\u00e0 tia \u0111\u1ed1i c\u1ee7a tia Ox. Khi \u0111\u00f3: <\/span>","options":{"time":14,"part":[{"time":3,"title":" <span class='basic_left'> Cho $\\widehat{AOB} = 150^{o} $. V\u1ec1 ph\u00eda ngo\u00e0i c\u1ee7a g\u00f3c AOB v\u1ebd hai tia OC v\u00e0 OD theo th\u1ee9 t\u1ef1 vu\u00f4ng g\u00f3c v\u1edbi OA, OB. G\u1ecdi Ox l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c AOB, Oy l\u00e0 tia \u0111\u1ed1i c\u1ee7a tia Ox. Khi \u0111\u00f3: <\/span>","title_trans":"","audio":"","temp":"matching","correct":[["2","4","1","3"]],"list":[{"point":10,"image":"","left":["$\\widehat{AOC} = $","$\\widehat{xOC} = $","$\\widehat{COy} = $","$\\widehat{BOy} = $"],"right":["$15^{o} $","$90^{o} $","$105^{o} $","$165^{o} $"],"top":100,"hint":"","explain":"<center><img src='img\/H7C12-46.png' \/><\/center> <span class='basic_left'> Ta c\u00f3: $OC \\perp OA $ n\u00ean $\\widehat{AOC} = 90^{o} $ <br\/> Ox l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c AOB n\u00ean $\\widehat{xOA} = \\dfrac{\\widehat{AOB}}{2} = \\dfrac{150^{o}}{2} = 75^{o} $ <br\/> Ox v\u00e0 OA thu\u1ed9c hai n\u1eeda m\u1eb7t ph\u1eb3ng \u0111\u1ed1i nhau b\u1edd OA n\u00ean tia OA n\u1eb1m gi\u1eefa hai tia Ox, OC do \u0111\u00f3: <br\/> $ \\widehat{xOC} = \\widehat{xOA} + \\widehat{AOC} = 75^{o} + 90^{o} = 165^{o}$ <br\/> Ox v\u00e0 Oy l\u00e0 hai tia \u0111\u1ed1i nhau n\u00ean $\\widehat{xOC} + \\widehat{COy} = 180^{o} \\\\ \\Rightarrow \\widehat{COy} = 180^{o} - 165^{o} = 15^{o} $ <br\/> T\u01b0\u01a1ng t\u1ef1 ta t\u00ednh \u0111\u01b0\u1ee3c $\\widehat{DOy} = 15^{o} $ <br\/> Suy ra $ \\widehat{BOy} = 90^{o} + 15^{o} = 105^{o}$ <\/span> <br\/> <span class='basic_pink'> V\u1eady: $\\widehat{AOC} = 90^{o} \\\\ \\widehat{xOC} = 165^{o} \\\\\\widehat{COy} = 15^{o} \\\\ \\widehat{BOy} = 105^{o} $<\/span>"}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:59"},{"id":"1383","post_id":"1000","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":14,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":10,"ques":"<span class='basic_left'> Cho g\u00f3c $\\widehat{AOB}$ b\u1eb1ng $130^{o} $. Trong g\u00f3c $\\widehat{AOB}$ v\u1ebd c\u00e1c tia OC, OD sao cho $OC \\perp OA, OD \\perp OB $ <br\/> S\u1ed1 \u0111o g\u00f3c $\\widehat{COD}$ l\u00e0? <\/span> ","select":[" A. $40^{o}$ "," B. $50^{o} $ "," C. $60^{o} $"," D. $90^{o} $"],"hint":"B\u01b0\u1edbc 1. T\u00ednh s\u1ed1 \u0111o g\u00f3c $\\widehat{BOC}$ <br\/> B\u01b0\u1edbc 2. T\u00ednh g\u00f3c $\\widehat{COD}$","explain":" <center><img src='img\/H7C12-11.png' \/><\/center> <span class='basic_left'> Ta c\u00f3 $OC \\perp OA \\Rightarrow \\widehat{AOC} = 90^{o} \\\\ OD \\perp OB \\Rightarrow \\widehat{BOD} = 90^{o} $ <br\/> Tia OC n\u1eb1m gi\u1eefa hai tia OA v\u00e0 OB n\u00ean <br\/> $\\widehat{AOC} + \\widehat{COB} = \\widehat{AOB} \\\\ \\Rightarrow \\widehat{COB} = \\widehat{AOB} - \\widehat{AOC} = 130^{o} - 90^{o} = 40^{o} $ <br\/> C\u00f3 $ \\widehat{COB} = 40^{o} < \\widehat{BOD} = 90^{o} $ n\u00ean tia OC n\u1eb1m gi\u1eefa hai tia OB v\u00e0 OD <br\/> $ \\Rightarrow \\widehat{BOC} + \\widehat{COD} = \\widehat{BOD} \\\\ \\Rightarrow \\widehat{COD} = \\widehat{BOD} - \\widehat{BOC} = 90^{o} - 40^{o} = 50^{o} $<\/span> <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:59"}]}