{"common":{"save":0,"post_id":"990","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1641","post_id":"990","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"T\u00ecm c\u00e2u tr\u1ea3 l\u1eddi sai: <center><img src='img\/H7B12-06.png' \/><\/center> ","select":["A. $\\triangle BDA = \\triangle CEA$ ","B. $\\triangle BEA = \\triangle CDA$ ","C. $\\widehat{EAB} = \\widehat{DAC}, AD = AE$ ","D. $\\triangle ADB = \\triangle ACE$ "],"explain":"<span class='basic_left'> X\u00e9t $\\triangle BDA$ v\u00e0 $\\triangle CEA$ c\u00f3: <br\/> $\\begin{cases} \\widehat{ADB} = \\widehat{AEC} (gt) \\\\ BD = CE (gt) \\\\ \\widehat{B_{2}} = \\widehat{C_{2}} \\hspace{0,2cm} \\text{(c\u00f9ng b\u00f9 v\u1edbi}\\, \\widehat{B_{1}}\\, \\text{ho\u1eb7c}\\, \\widehat{C_{1}}) \\end{cases}$ <br\/> $\\Rightarrow$ $\\triangle BDA = \\triangle CEA$ (g . c . g) $\\Rightarrow $ <b>\u0110\u00e1p \u00e1n A \u0111\u00fang <\/b> <br\/> $\\Rightarrow BD=CE$ (hai c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng) <br\/> X\u00e9t $\\triangle BEA$ v\u00e0 $\\triangle CDA$ c\u00f3: <br\/> $\\begin{cases} \\widehat{E} = \\widehat{D} (gt) \\\\ DC = BE \\hspace{0,2cm} \\text{ (= DB + BC)} \\\\ \\widehat{B_{1}} = \\widehat{C_{1}} (gt) \\end{cases}$ <br\/> $\\Rightarrow$ $\\triangle BEA = \\triangle CDA$ (g . c . g) <br\/> $\\Rightarrow \\widehat {EAB} = \\widehat {DAC}$ (g\u00f3c t\u01b0\u01a1ng \u1ee9ng) <br\/> $\\Rightarrow AD = AE$ (c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng) <br\/> <span class='basic_pink'>C\u00e2u tr\u1ea3 l\u1eddi sai l\u00e0 D <\/span> <\/span>","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:02"},{"id":"1642","post_id":"990","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<span class='basic_left'>Cho Oz l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c $\\widehat{xOy} $. Tr\u00ean c\u1ea1nh Ox l\u1ea5y \u0111i\u1ec3m A sao cho $OA = 1cm$. K\u1ebb t\u1eeb A \u0111\u01b0\u1eddng vu\u00f4ng g\u00f3c v\u1edbi Oz, n\u00f3 c\u1eaft Oy t\u1ea1i B. \u0110\u1ed9 d\u00e0i c\u1ea1nh OB l\u00e0: <\/span> ","select":["A. $1 cm $ ","B. $2 cm $ ","C. $3 cm $ ","D. $4 cm $ "],"explain":" <span class='basic_left'> <center><img src='img\/H7B12-56.png' \/><\/center> G\u1ecdi H l\u00e0 giao \u0111i\u1ec3m c\u1ee7a $AB$ v\u00e0 tia $Oz$. <br\/> X\u00e9t hai tam gi\u00e1c vu\u00f4ng $AOH$ v\u00e0 $BOH$ c\u00f3: <br\/> + $\\widehat{O_{1}} = \\widehat{O_{2}} $ (gi\u1ea3 thi\u1ebft) <br\/> + c\u1ea1nh g\u00f3c vu\u00f4ng OH chung <br\/> $\\widehat{AHO}=\\widehat{BHO}=90^o$ <br\/> $\\Rightarrow \\triangle AOH = \\triangle BOH $ (g - c - g) <br\/> $\\Rightarrow OA = OB $ (hai c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng) <br\/> M\u00e0 $OA = 1cm \\Rightarrow OB = 1cm $<br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:02"},{"id":"1643","post_id":"990","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<span class='basic_left'>Cho $\\triangle ABC $ v\u00e0 $\\triangle KHI $ c\u00f3 $\\widehat{A} = \\widehat{H} = 90^{o}, AC = IH, \\widehat{C} = \\widehat{I} $. <br\/> Ph\u00e1t bi\u1ec3u n\u00e0o trong c\u00e1c ph\u00e1t bi\u1ec3u sau l\u00e0 \u0111\u00fang? <\/span> ","select":["A. $\\triangle ABC > \\triangle HIK $ ","B. $\\triangle ACB = \\triangle HIK $","C. $\\triangle ACB < \\triangle KIH $"],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm \u0111\u00fang th\u1ee9 t\u1ef1 c\u00e1c \u0111\u1ec9nh. ","explain":"<center><img src='img\/H7B12-54.png' \/><\/center> <span class='basic_left'> Tam gi\u00e1c $ABC$ v\u00e0 tam gi\u00e1c $MNP$ c\u00f3: <br\/> + $\\widehat{A} = \\widehat{H}=90^o$ <br\/> + $AC=IH$ (gi\u1ea3 thi\u1ebft) <br\/> + $\\widehat{C} = \\widehat{I}$ (gi\u1ea3 thi\u1ebft) <br\/> $\\Rightarrow \\triangle ACB = \\triangle HIK (g.c.g) $ <br\/><br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span> <\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:02"}]}