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{"common":{"save":0,"post_id":"994","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1331","post_id":"994","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":[[["240"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"Cho hai \u0111\u01b0\u1eddng th\u1eb3ng xx' v\u00e0 yy' c\u1eaft nhau t\u1ea1i O sao cho $\\widehat{xOy} = 60^{o} $ <br\/> T\u00ednh: $\\widehat{xOy'} + \\widehat{x'Oy} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o} $ <center><img src='img\/H7C11-36.png' \/><\/center> ","hint":" T\u00ednh g\u00f3c $\\widehat{xOy'} $. Nh\u1eadn x\u00e9t m\u1ed1i li\u00ean h\u1ec7 gi\u1eefa g\u00f3c $\\widehat{xOy'}$ v\u00e0 $\\widehat{x'Oy}$ r\u1ed3i t\u00ednh. ","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau. <br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $\\widehat{xOy} + \\widehat{xOy'} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> Suy ra: $\\widehat{xOy'}$ $ = 180^{o} - \\widehat{xOy} \\\\ = 180^{o} - 60^{o} \\\\ = 120^{o} $ <br\/> M\u00e0 $ \\widehat{xOy'} = \\widehat{x'Oy}$ (hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh) <br\/> Suy ra $\\widehat{xOy'} + \\widehat{x'Oy} = 120^{o} + 120^{o} = 240^{o} $ <\/span> <br\/><br\/> \u0110\u00e1p s\u1ed1 l\u00e0: $240^{o} $. <\/span><\/span> "}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1332","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"<center><img src='img\/H7C11-35.png' \/><\/center> <br\/> Cho hai \u0111\u01b0\u1eddng th\u1eb3ng xx' v\u00e0 yy' c\u1eaft nhau t\u1ea1i O sao cho $\\widehat{xOy} = \\dfrac{2}{3}\\widehat{xOy'} $ . T\u00ednh $\\widehat{xOy'}$ ? <\/span> ","select":[" A. $136^{o}$ "," B. $102^{o} $ "," C. $108^{o} $"," D. $110^{o} $"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <center><img src='img\/H7C11-35.png' \/><\/center> Ta c\u00f3: $ \\widehat{xOy} + \\widehat{xOy'} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> M\u00e0 $\\widehat{xOy} = \\dfrac{2}{3}\\widehat{xOy'} $ (gi\u1ea3 thi\u1ebft) <br\/> Suy ra $\\dfrac{2}{3}\\widehat{xOy'} + \\widehat{xOy'} = 180^{o} \\\\ \\Rightarrow \\dfrac{5}{3}\\widehat{xOy'} = 180^{o} \\\\ \\Rightarrow \\widehat{xOy'} = 108^{o} $ <\/span> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1333","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Cho hai \u0111\u01b0\u1eddng th\u1eb3ng AB v\u00e0 CD c\u1eaft nhau t\u1ea1i O t\u1ea1o th\u00e0nh 4 g\u00f3c kh\u00e1c g\u00f3c b\u1eb9t. Cho bi\u1ebft $\\widehat{AOD} + \\widehat{BOC} = 150^{o} $ . T\u00ednh g\u00f3c $\\widehat{AOC}$ ? <\/span> ","select":[" A. $105^{o}$ "," B. $210^{o} $ "," C. $60^{o} $"," D. $150^{o} $"],"hint":"B1. T\u00ednh g\u00f3c $\\widehat{AOD}$ <br\/> B2. T\u00ednh $\\widehat{AOC} $","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau. <br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <center><img src='img\/H7C11-33.png' \/><\/center> Ta c\u00f3: $ \\widehat{AOD} = \\widehat{BOC}$ (hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh) <br\/> M\u00e0 $\\widehat{AOD} + \\widehat{BOC} = 150^{o} $ (gi\u1ea3 thi\u1ebft) <br\/> Suy ra $2\\widehat{AOD} = 150^{o} \\\\ \\Rightarrow \\widehat{AOD} = 75^{o} $ <br\/> M\u1eb7t kh\u00e1c: $\\widehat{AOD} + \\widehat{AOC} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> $\\Rightarrow \\widehat{AOC} $ $ = 180^{o} - \\widehat{AOD} \\\\ = 180^{o} - 75^{o} \\\\ = 105^{o} $ <\/span> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1334","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ba \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m O. T\u1ed5ng s\u1ed1 c\u00e1c c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh (kh\u00f4ng k\u1ec3 g\u00f3c b\u1eb9t) l\u00e0? <\/span> ","select":["A. 3 c\u1eb7p ","B. 12 c\u1eb7p ","C. 6 c\u1eb7p ","D. 9 c\u1eb7p "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm ph\u00e1t bi\u1ec3u \u0111\u00fang.","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0 hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia. <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/><center><img src='img\/H7C11-32.png' \/><\/center> Ba \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m O t\u1ea1o th\u00e0nh 6 c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh: <br\/> $\\widehat{O_{1}} $ \u0111\u1ed1i \u0111\u1ec9nh $\\widehat{O_{4}} $; $\\widehat{O_{2}} $ \u0111\u1ed1i \u0111\u1ec9nh $\\widehat{O_{5}} $ ; $\\widehat{O_{3}} $ \u0111\u1ed1i \u0111\u1ec9nh $\\widehat{O_{6}} $ <br\/> $\\widehat{O_{12}} $ \u0111\u1ed1i \u0111\u1ec9nh $\\widehat{O_{45}} $; $\\widehat{O_{23}} $ \u0111\u1ed1i \u0111\u1ec9nh $\\widehat{O_{56}} $; $\\widehat{O_{34}} $ \u0111\u1ed1i \u0111\u1ec9nh $\\widehat{O_{16}} $ L\u01b0u \u00fd <\/b> <br\/> Ta c\u00f3 c\u00f4ng th\u1ee9c t\u00ednh s\u1ed1 c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh (kh\u00f4ng k\u1ec3 g\u00f3c b\u1eb9t) l\u00e0: <br\/> S\u1ed1 c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh = n(n - 1) (v\u1edbi n l\u00e0 s\u1ed1 \u0111\u01b0\u1eddng th\u1eb3ng) <\/span><br\/> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1335","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Cho hai \u0111\u01b0\u1eddng th\u1eb3ng xx' v\u00e0 yy' c\u1eaft nhau t\u1ea1i O. V\u1ebd tia Ot sao cho $\\widehat{xOt} = \\widehat{xOy} $ (tia Ot kh\u00f4ng tr\u00f9ng v\u1edbi tia Oy). <br\/> Khi \u0111\u00f3 $\\widehat{xOy}$ v\u00e0 $\\widehat{tOx}$ l\u00e0 hai g\u00f3c: <\/span> ","select":["A. \u0111\u1ed1i \u0111\u1ec9nh ","B. b\u00f9 nhau ","C. k\u1ec1 nhau v\u00e0 b\u1eb1ng nhau ","D. k\u1ec1 nhau nh\u01b0ng kh\u00f4ng b\u1eb1ng nhau "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i \u0111\u01b0a ra k\u1ebft lu\u1eadn. ","explain":" <center><img src='img\/H7C11-44.png' \/><\/center> <br\/> $\\widehat{xOy}$ v\u00e0 $\\widehat{tOx}$ l\u00e0 hai g\u00f3c k\u1ec1 nhau v\u00e0 b\u1eb1ng nhau. <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1336","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Cho hai \u0111\u01b0\u1eddng th\u1eb3ng AB v\u00e0 CD c\u1eaft nhau t\u1ea1i O. V\u1ebd tia ph\u00e2n gi\u00e1c OM c\u1ee7a g\u00f3c AOC. G\u1ecdi ON l\u00e0 tia \u0111\u1ed1i c\u1ee7a tia OM <br\/> Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y kh\u00f4ng \u0111\u00fang? <\/span> ","select":["A. Tia ON l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c $\\widehat{BOD} $ ","B. $\\widehat{AON}$ v\u00e0 $\\widehat{MOB}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","C. $\\widehat{MOA}$ v\u00e0 $\\widehat{NOD}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","D. $\\widehat{MOC}$ v\u00e0 $\\widehat{NOD}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm ph\u00e1t bi\u1ec3u \u0111\u00fang.","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0 hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia. <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/><center><img src='img\/H7C11-29.png' \/><\/center> <br\/> Ph\u00e1t bi\u1ec3u kh\u00f4ng \u0111\u00fang l\u00e0 C. <br\/> V\u00ec $\\widehat{MOA}$ v\u00e0 $\\widehat{NOD}$ kh\u00f4ng ph\u1ea3i l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh (do OD kh\u00f4ng ph\u1ea3i l\u00e0 tia \u0111\u1ed1i c\u1ee7a tia OA). <br\/><br\/> <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1337","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Cho g\u00f3c b\u1eb9t AOB. Tr\u00ean c\u00f9ng m\u1ed9t n\u1eeda m\u1eb7t ph\u1eb3ng b\u1edd AB, ta v\u1ebd hai tia OC v\u00e0 OD sao cho $\\widehat{AOD} = \\widehat{BOC} = 45^{o} $. V\u1ebd tia OM sao cho tia OA l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c MOD. <br\/> Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang? <\/span> ","select":["A. $\\widehat{AOD}$ v\u00e0 $\\widehat{BOC}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","B. $\\widehat{MOB}$ v\u00e0 $\\widehat{DOC}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","C. $\\widehat{AOM}$ v\u00e0 $\\widehat{BOC}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","D. $\\widehat{BOD}$ v\u00e0 $\\widehat{MOA}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm ph\u00e1t bi\u1ec3u \u0111\u00fang.","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0 hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia. <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/><center><img src='img\/H7C11-28.png' \/><\/center> <br\/> Ta c\u00f3 $\\widehat{AOM}$ v\u00e0 $\\widehat{BOC}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1338","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Cho hai tia Om v\u00e0 On l\u00e0 hai tia ph\u00e2n gi\u00e1c c\u1ee7a hai g\u00f3c k\u1ec1 b\u00f9 $\\widehat{xOy}$ v\u00e0 $ \\widehat{xOy'}$. <br\/> T\u00ednh $\\widehat{mOn}$? <center><img src='img\/H7C11-26.png' \/><\/center> ","select":[" A. $45^{o}$ "," B. $60^{o} $ "," C. $90^{o} $"," D. $30^{o} $"],"hint":"T\u00ednh $ \\widehat{mOn} = \\widehat{xOm} + \\widehat{xOn}$ ","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau. <br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> C\u00f3 Om v\u00e0 On l\u1ea7n l\u01b0\u1ee3t l\u00e0 hai tia ph\u00e2n gi\u00e1c c\u1ee7a hai g\u00f3c k\u1ec1 b\u00f9 $\\widehat{xOy}$ v\u00e0 $ \\widehat{xOy'}$ <br\/> n\u00ean $ \\widehat{xOy} = 2.\\widehat{xOm}; \\widehat{xOy'} = 2.\\widehat{xOn}$ <br\/> M\u1eb7t kh\u00e1c: $\\widehat{xOy} + \\widehat{xOy'} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> Suy ra: $2.\\widehat{xOm} + 2.\\widehat{xOn} = 180^{o} \\\\ \\Leftrightarrow 2.(\\widehat{xOm} + \\widehat{xOn}) = 180^{o} \\\\ \\Leftrightarrow 2.\\widehat{mOn} = 180^{o} \\\\ \\Leftrightarrow \\widehat{mOn} = 90^{o} $<\/span> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1339","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Hai \u0111\u01b0\u1eddng th\u1eb3ng AB v\u00e0 CD c\u1eaft nhau t\u1ea1i O. Bi\u1ebft $ \\widehat{AOC} + \\widehat{BOD} = 130^{o} $. <br\/> T\u00ednh s\u1ed1 \u0111o g\u00f3c $ \\widehat{AOD} $ <center><img src='img\/H7C11-25.png' \/><\/center> ","select":[" A. $65^{o}$ "," B. $115^{o} $ "," C. $130^{o} $"," D. $75^{o} $"],"hint":"B\u01b0\u1edbc 1. T\u00ednh g\u00f3c $\\widehat{AOC}$ <br\/> B\u01b0\u1edbc 2. T\u00ednh g\u00f3c $\\widehat{AOD} $.","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau. <br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $ \\widehat{AOC} = \\widehat{BOD}$ (hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh) <br\/> $ \\widehat{AOC} + \\widehat{BOD} = 130^{o} $ (gi\u1ea3 thi\u1ebft) <br\/> $\\Rightarrow 2\\widehat{AOC} = 130^{o} \\\\ \\Rightarrow \\widehat{AOC} = 65^{o} $ <br\/> M\u1eb7t kh\u00e1c $ \\widehat{AOC} + \\widehat{AOD} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> $\\Rightarrow \\widehat{AOD}$ = $ 180^{o} - \\widehat{AOC} \\\\ = 180^{o} - 65^{o} \\\\ = 115^{o}$ <\/span> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1340","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","f","f","t"]],"list":[{"point":5,"image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":["Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau ","Hai g\u00f3c b\u1eb1ng nhau th\u00ec \u0111\u1ed1i \u0111\u1ec9nh","Hai g\u00f3c kh\u00f4ng \u0111\u1ed1i \u0111\u1ec9nh th\u00ec kh\u00f4ng b\u1eb1ng nhau","Hai g\u00f3c kh\u00f4ng b\u1eb1ng nhau th\u00ec kh\u00f4ng \u0111\u1ed1i \u0111\u1ec9nh"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a v\u00e0 t\u00ednh ch\u1ea5t hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":["\u0110\u00fang, do t\u00ednh ch\u1ea5t hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh","<br\/> Sai. V\u00ed d\u1ee5:<center><img src='img\/H7C11-09.png' \/><\/center>","<br\/> Sai. V\u00ed d\u1ee5: <center><img src='img\/H7C11-08.png' \/><\/center>","<br\/> \u0110\u00fang, v\u00ec hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau."]}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1341","post_id":"994","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":[[["45"],["135"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"Hai \u0111\u01b0\u1eddng th\u1eb3ng MN v\u00e0 PQ c\u1eaft nhau t\u1ea1i I t\u1ea1o th\u00e0nh g\u00f3c MIP c\u00f3 s\u1ed1 \u0111o b\u1eb1ng $45^{o} $. <br\/> S\u1ed1 \u0111o g\u00f3c $\\widehat{NIQ}, \\widehat{MIQ} $ l\u00e0? <br\/> \u0110\u00e1p s\u1ed1: $\\widehat{NIQ} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o} \\qquad \\widehat{MIQ} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o} $ ","hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau. <br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <center><img src='img\/H7C11-24.png' \/><\/center> Ta c\u00f3: $\\widehat{NIQ} = \\widehat{MIP} = 45^{o} $ (hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh) <br\/> M\u1eb7t kh\u00e1c $ \\widehat{MIQ} + \\widehat{MIP} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> $ \\Rightarrow \\widehat{MIQ}$ $ = 180^{o} - \\widehat{MIP} \\\\ = 180^{o} - 45^{o} \\\\ = 135^{o} $<\/span> <br\/><br\/> \u0110\u00e1p s\u1ed1: $\\widehat{NIQ} = 45^{o}; \\widehat{MIQ} = 135^{o} $ <\/span><\/span> "}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1342","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" Cho h\u00ecnh sau, gi\u1ea3 s\u1eed g\u00f3c $\\widehat{O_{2}}$ l\u1edbn h\u01a1n g\u00f3c $\\widehat{O_{3}}$ l\u00e0 $30^{o}$. T\u00ednh g\u00f3c $\\widehat{O_{1}}?$ <center><img src='img\/H7C11-21.png' \/><\/center> ","select":[" A. $30^{o}$ "," B. $140^{o} $ "," C. $150^{o} $"," D. $75^{o} $"],"hint":"T\u00ednh g\u00f3c $\\widehat{O_{3}}$ r\u1ed3i suy ra $\\widehat{O_{1}}$.","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau. <br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $ \\widehat{O_{2}} + \\widehat{O_{3}} = 180^{o} $ (hai g\u00f3c k\u1ec1 b\u00f9) <br\/> M\u00e0 $\\widehat{O_{2}} - \\widehat{O_{3}} = 30^{o} $ (gi\u1ea3 thi\u1ebft) <br\/> n\u00ean $\\widehat{O_{3}} = \\dfrac{180^{o}-30^{o}}{2} = 75^{o} $ <br\/> V\u1eady $\\widehat{O_{1}} = \\widehat{O_{3}} = 75^{o} $ (hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh) <\/span> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1343","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0: ","select":["A. Hai g\u00f3c m\u00e0 m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia <\/span>","B. Hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i c\u1ee7a m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia<\/span>","C. Hai g\u00f3c c\u00f3 chung \u0111\u1ec9nh v\u00e0 kh\u00f4ng c\u00f3 c\u1ea1nh chung<\/span>","D. Hai g\u00f3c m\u00e0 m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i c\u1ee7a m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia v\u00e0 hai c\u1ea1nh kia c\u00f9ng n\u1eb1m tr\u00ean m\u1ed9t n\u1eeda m\u1eb7t ph\u1eb3ng <\/span>"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":" Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0 hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i c\u1ee7a m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia.<br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":1}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1344","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Ch\u1ecdn h\u00ecnh v\u1ebd \u0111\u00fang <br\/> V\u1ebd g\u00f3c xBy c\u00f3 s\u1ed1 \u0111o b\u1eb1ng $60^{o}$. V\u1ebd g\u00f3c x'By' \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi g\u00f3c v\u1edbi g\u00f3c xBy <br\/> <img src='img\/H7C11-05A.png' \/><img src='img\/H7C11-05B.png' \/> ","select":["H\u00ecnh 1 "," H\u00ecnh 2 "," H\u00ecnh 3"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Xem m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y c\u00f3 ph\u1ea3i l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia kh\u00f4ng? <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> \u1ede h\u00ecnh 3 ta th\u1ea5y g\u00f3c xBy v\u00e0 g\u00f3c x'By' l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh <br\/> v\u00ec c\u1ea1nh Ox l\u00e0 tia \u0111\u1ed1i c\u1ee7a c\u1ea1nh Ox' v\u00e0 c\u1ea1nh Oy l\u00e0 tia \u0111\u1ed1i c\u1ee7a c\u1ea1nh Oy'. <br\/><br\/> \u0110\u00e1p \u00e1n l\u00e0 H\u00ecnh 3. <\/span><\/span> ","column":3}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1345","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Hai \u0111\u01b0\u1eddng th\u1eb3ng xy v\u00e0 x'y' c\u1eaft nhau t\u1ea1i M. <br\/> Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang. <center><img src='img\/H7C11-18.png' \/><\/center>","select":["A. $\\widehat{M_{1}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{2}}$ v\u00e0 $\\widehat{M_{2}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{3}}$","B. $\\widehat{M_{2}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{3}}$ v\u00e0 $\\widehat{M_{3}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{4}}$","C. $\\widehat{M_{1}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{3}}$ v\u00e0 $\\widehat{M_{2}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{4}}$","D. $\\widehat{M_{4}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{1}}$ v\u00e0 $\\widehat{M_{1}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{2}}$"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0 hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia. <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> Hai \u0111\u01b0\u1eddng th\u1eb3ng xy v\u00e0 x'y' c\u1eaft nhau t\u1ea1i M c\u00f3 2 c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0: <br\/> $\\widehat{M_{1}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{3}}$ v\u00e0 $\\widehat{M_{2}}$ \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi $\\widehat{M_{4}}$ <br\/> <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1346","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"V\u1ebd hai \u0111\u01b0\u1eddng th\u1eb3ng xx' v\u00e0 yy' c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m A t\u1ea1o th\u00e0nh g\u00f3c $\\widehat{xAy}$ c\u00f3 s\u1ed1 \u0111o b\u1eb1ng $55^{0}$. <br\/> S\u1ed1 \u0111o g\u00f3c $\\widehat{xAy'}$ l\u00e0? <center><img src='img\/H7C11-12.png' \/><\/center> ","select":["A. $55^{0}$","B. $125^{0}$ ","C. $145^{0}$","D. $35^{0}$"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c k\u1ec1 b\u00f9 c\u00f3 t\u1ed5ng b\u1eb1ng $180^{o}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3 hai g\u00f3c xAy v\u00e0 xAy' l\u00e0 hai g\u00f3c k\u1ec1 b\u00f9 n\u00ean: <br\/> $\\widehat{xAy} + \\widehat{xAy'} = 180^{o}$ <br\/> Suy ra: $\\widehat{xAy'}$$ =180^{o} - \\widehat{xAy} \\\\ = 180^{o} - 55^{o} \\\\ = 125^{o} $ <br\/><br\/> \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 09:22:58"},{"id":"1347","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Cho h\u00ecnh sau <center><img src='img\/H7C11-11.png' \/><\/center> Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang? ","select":["A. $\\widehat{xOx'}$ v\u00e0 $\\widehat{yOy'}$ \u0111\u1ed1i \u0111\u1ec9nh","B. $\\widehat{xOx'}$ v\u00e0 $\\widehat{xOy'}$ k\u1ec1 b\u00f9 ","C. $\\widehat{xOy'}$ v\u00e0 $\\widehat{y'Oy}$ k\u1ec1 b\u00f9","D. $\\widehat{yOx'}$ v\u00e0 $\\widehat{xOy'}$ k\u1ec1 b\u00f9"],"hint":"","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh: Xem m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y c\u00f3 ph\u1ea3i l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia kh\u00f4ng? <br\/> Hai g\u00f3c k\u1ec1 b\u00f9: l\u00e0 hai g\u00f3c v\u1eeba k\u1ec1 nhau v\u1eeba b\u00f9 nhau (c\u00f3 t\u1ed5ng s\u1ed1 \u0111o b\u1eb1ng 180 \u0111\u1ed9) <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> Trong h\u00ecnh tr\u00ean ta th\u1ea5y $\\widehat{xOy'}$ v\u00e0 $\\widehat{y'Oy}$ l\u00e0 hai g\u00f3c k\u1ec1 b\u00f9<br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1348","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Cho g\u00f3c b\u1eb9t AOB. Tr\u00ean c\u00f9ng m\u1ed9t n\u1eeda m\u1eb7t ph\u1eb3ng b\u1edd AB, v\u1ebd hai tia OC v\u00e0 OD sao cho $\\widehat {AOD} = \\widehat {BOC} = 30^{0}$ <br\/> Hai g\u00f3c $\\widehat {AOD} $ v\u00e0 $ \\widehat {BOC}$ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh? ","select":[" \u0110\u00fang "," Sai "],"hint":"Xem \u0111\u1ecbnh ngh\u0129a hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh l\u00e0 hai g\u00f3c m\u00e0 m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia. <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> <center><img src='img\/H7C11-08.png' \/><\/center> Ta c\u00f3 $\\widehat {AOD} $ v\u00e0 $ \\widehat {BOC}$ kh\u00f4ng ph\u1ea3i l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh v\u00ec hai tia OC v\u00e0 OD kh\u00f4ng ph\u1ea3i l\u00e0 hai tia \u0111\u1ed1i nhau. <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 Sai. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1349","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"V\u1ebd g\u00f3c xBy c\u00f3 s\u1ed1 \u0111o b\u1eb1ng $60^{o}$. <br\/> H\u1ecfi g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi g\u00f3c xBy c\u00f3 s\u1ed1 \u0111o l\u00e0:","select":["A. $90^{o}$ ","B. $120^{o}$ ","C. $60^{o}$ ","D. $30^{o}$"],"hint":"Xem t\u00ednh ch\u1ea5t hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":" Ta c\u00f3: hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau <br\/> n\u00ean g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh v\u1edbi g\u00f3c c\u00f3 s\u1ed1 \u0111o b\u1eb1ng $60^{o}$ c\u0169ng c\u00f3 s\u1ed1 \u0111o l\u00e0 $60^{o}$. <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"},{"id":"1350","post_id":"994","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <center><img src='img\/H7C11-01.png' \/><\/center>","select":["A. G\u00f3c x'Oy v\u00e0 g\u00f3c xOy' l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh ","B. G\u00f3c x'Oy v\u00e0 g\u00f3c xOy' l\u00e0 hai g\u00f3c k\u1ec1 b\u00f9 ","C. G\u00f3c x'Oy' v\u00e0 g\u00f3c xOy l\u00e0 hai g\u00f3c k\u1ec1 b\u00f9"],"hint":"Xem \u0111\u1ecbnh ngh\u0129a hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh: Xem m\u1ed7i c\u1ea1nh c\u1ee7a g\u00f3c n\u00e0y c\u00f3 ph\u1ea3i l\u00e0 tia \u0111\u1ed1i m\u1ed9t c\u1ea1nh c\u1ee7a g\u00f3c kia kh\u00f4ng? <br\/> Hai g\u00f3c k\u1ec1 b\u00f9: l\u00e0 hai g\u00f3c v\u1eeba k\u1ec1 nhau v\u1eeba b\u00f9 nhau (c\u00f3 t\u1ed5ng s\u1ed1 \u0111o b\u1eb1ng 180 \u0111\u1ed9) <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span> <br\/> G\u00f3c x'Oy v\u00e0 g\u00f3c xOy' l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh <br\/> v\u00ec c\u1ea1nh Ox l\u00e0 tia \u0111\u1ed1i c\u1ee7a c\u1ea1nh Ox' v\u00e0 c\u1ea1nh Oy l\u00e0 tia \u0111\u1ed1i c\u1ee7a c\u1ea1nh Oy'. <br\/> T\u01b0\u01a1ng t\u1ef1 ta c\u0169ng c\u00f3 g\u00f3c x'Oy' v\u00e0 g\u00f3c xOy l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. <br\/><br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":1}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:58"}]}