{"common":{"save":0,"post_id":"993","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1691","post_id":"993","mon_id":"0","chapter_id":"0","question":"N\u1ed1i t\u1eeb ho\u1eb7c c\u1ee5m t\u1eeb \u1edf c\u1ed9t b\u00ean tr\u00e1i v\u1edbi c\u1ed9t b\u00ean ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e2u ho\u00e0n ch\u1ec9nh","options":{"time":24,"part":[{"time":3,"title":"N\u1ed1i t\u1eeb ho\u1eb7c c\u1ee5m t\u1eeb \u1edf c\u1ed9t b\u00ean tr\u00e1i v\u1edbi c\u1ed9t b\u00ean ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e2u ho\u00e0n ch\u1ec9nh","title_trans":"Cho h\u00ecnh v\u1ebd, bi\u1ebft $CB = CD, BF = DE$. <br\/> H\u00e3y gh\u00e9p c\u00e1c \u00fd ch\u1ee9ng minh $\\widehat{C_{1}} = \\widehat{C_{2}} $","audio":"","temp":"matching","correct":[["2","3","4","1"]],"list":[{"point":10,"image":"img\/H7B13-44.png","left":["$CB = CD, BF = DE $","$\\widehat{B} = \\widehat{D} $","$\\triangle CBF = \\triangle CDE $","$\\widehat{C_{1}} = \\widehat{C_{2}} $"],"right":["hai g\u00f3c t\u01b0\u01a1ng \u1ee9ng","gi\u1ea3 thi\u1ebft","do $\\triangle CBD $ c\u00e2n","theo tr\u01b0\u1eddng h\u1ee3p c\u1ea1nh-g\u00f3c-c\u1ea1nh"],"top":100,"explain":"<span class='basic_left'>Ta c\u00f3: <br\/> + $CB = CD$ <br\/> + $\\widehat{B} = \\widehat{D} $ (do $\\triangle CBD $ c\u00e2n t\u1ea1i C ) <br\/> + $BF = DE $ (gi\u1ea3 thi\u1ebft) <br\/> Do \u0111\u00f3 $\\triangle CBF = \\triangle CDE $ (c.g.c) <br\/> Suy ra $\\widehat{C_{1}} = \\widehat{C_{2}} $ (hai g\u00f3c t\u01b0\u01a1ng \u1ee9ng).<\/span> "}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:02"},{"id":"1692","post_id":"993","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","f","f","t","t"]],"list":[{"point":10,"image":"","ques":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":["N\u1ebfu m\u1ed9t tam gi\u00e1c c\u00f3 hai c\u1ea1nh b\u1eb1ng nhau th\u00ec tam gi\u00e1c \u0111\u00f3 c\u00f3 hai g\u00f3c b\u1eb1ng nhau.","N\u1ebfu m\u1ed9t tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c b\u1eb1ng $60^{o}$ th\u00ec tam gi\u00e1c \u0111\u00f3 l\u00e0 tam gi\u00e1c \u0111\u1ec1u.","N\u1ebfu m\u1ed9t tam gi\u00e1c c\u00f3 hai g\u00f3c b\u1eb1ng nhau v\u00e0 hai c\u1ea1nh b\u1eb1ng nhau th\u00ec \u0111\u00f3 l\u00e0 tam gi\u00e1c \u0111\u1ec1u. ","Tam gi\u00e1c vu\u00f4ng c\u00f3 hai g\u00f3c nh\u1ecdn b\u1eb1ng nhau l\u00e0 tam gi\u00e1c vu\u00f4ng c\u00e2n. ","Tam gi\u00e1c c\u00f3 hai g\u00f3c b\u1eb1ng $60^{o} $ l\u00e0 tam gi\u00e1c \u0111\u1ec1u."],"explain":["1 - \u0110\u00fang, theo \u0111\u1ecbnh ngh\u0129a v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a tam gi\u00e1c c\u00e2n.","<br\/> <center><img src='img\/H7B13-42.png' \/><\/center> 2 - Sai. V\u00ed d\u1ee5 $\\triangle ABC$ c\u00f3 $\\widehat{B} = 60^{o}, BC > AB $ th\u00ec $\\triangle ABC $ kh\u00f4ng ph\u1ea3i l\u00e0 tam gi\u00e1c \u0111\u1ec1u. ","<br\/> <center><img src='img\/H7B13-43.png' \/><\/center> 3 - Sai. V\u00ed d\u1ee5 $\\triangle ABC $ c\u00f3 $\\widehat{B} = \\widehat{C}, AB = AC $ nh\u01b0ng $\\triangle ABC $ kh\u00f4ng ph\u1ea3i tam gi\u00e1c \u0111\u1ec1u.","<br\/> 4 - \u0110\u00fang theo \u0111\u1ecbnh ngh\u0129a tam gi\u00e1c c\u00e2n.","<br\/> 5 - \u0110\u00fang, v\u00ec khi \u0111\u00f3 g\u00f3c c\u00f2n l\u1ea1i c\u0169ng b\u1eb1ng $60^{o} $ do \u0111\u00f3 n\u00f3 l\u00e0 tam gi\u00e1c \u0111\u1ec1u theo \u0111\u1ecbnh ngh\u0129a."]}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:02"},{"id":"1693","post_id":"993","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":10,"ques":"<span class='basic_left'>Cho g\u00f3c $\\widehat{xOy} = 120^{o} $, \u0111i\u1ec3m A thu\u1ed9c tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c \u0111\u00f3. <br\/> K\u1ebb $AB \\perp Ox (B \\in Ox) $, k\u1ebb $AC \\perp Oy (C \\in Oy)$. <br\/> Tam gi\u00e1c ABC l\u00e0: <\/span> ","select":["A. Tam gi\u00e1c c\u00e2n","B. Tam gi\u00e1c \u0111\u1ec1u","C. Tam gi\u00e1c vu\u00f4ng","D. Tam gi\u00e1c vu\u00f4ng c\u00e2n."],"explain":"<center><img src='img\/H7B13-18.png' \/><\/center> <span class='basic_left'> Ta th\u1ea5y trong $\\Delta AOB$ v\u00e0 $\\Delta AOC$: <br\/> + $\\widehat{O_{1}} = \\widehat{O_{2}} $ (do OA l\u00e0 tia ph\u00e2n gi\u00e1c) <br\/> + $\\widehat{OCA} = \\widehat {OBA} = 90^{o}$ <br\/> $\\Rightarrow$ $\\widehat {CAO} = \\widehat {BAO}$ <br\/> X\u00e9t $ \\triangle AOB $ v\u00e0 $\\triangle AOC$ c\u00f3: <br\/> + $\\widehat{O_{1}} = \\widehat{O_{2}} $ (do OA l\u00e0 tia ph\u00e2n gi\u00e1c) <br\/> + C\u1ea1nh OA chung <br\/> + $\\widehat {CAO} = \\widehat {BAO}$ (ch\u1ee9ng minh tr\u00ean) <br\/> Do \u0111\u00f3 $\\triangle AOB = \\triangle AOC $ (g . c . g) <br\/> $\\Rightarrow AB = AC $ (1) <br\/> M\u1eb7t kh\u00e1c c\u00f3 $\\widehat{O_{1}} = \\widehat{O_{2}} = \\dfrac{xOy}{2} = \\dfrac{120^{o}}{2} = 60^{o} $ <br\/> n\u00ean $ \\widehat{A_{1}} = \\widehat{A_{2}} = 90^{o} - 60^{o} = 30^{o} $ <br\/> suy ra $\\widehat{BAC} = 60^{o} $ (2) <br\/> T\u1eeb (1) v\u00e0 (2), tam gi\u00e1c ABC c\u00e2n c\u00f3 $\\widehat{BAC} = 60^{o} $ n\u00ean l\u00e0 tam gi\u00e1c \u0111\u1ec1u.<br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:02"}]}