{"common":{"save":0,"post_id":"1022","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1511","post_id":"1022","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":"<span class='basic_left'>Cho \u0111\u01b0\u1eddng th\u1eb3ng a c\u1eaft hai \u0111\u01b0\u1eddng th\u1eb3ng b, c. Sao cho trong c\u00e1c g\u00f3c t\u1ea1o th\u00e0nh t\u1eeb a, b, c c\u00f3 m\u1ed9t c\u1eb7p g\u00f3c \u0111\u1ed3ng v\u1ecb b\u1eb1ng nhau v\u1edbi s\u1ed1 \u0111o b\u1eb1ng $35^{o}$ nh\u01b0 h\u00ecnh v\u1ebd. H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t. <\/span> <center><img src='img\/H7C17-45.png' \/><\/center> ","select":["A. $\\widehat{A_{4}} = 35^{o}$ ","B. $\\widehat{A_{3}} = 145^{o}$ ","C. $\\widehat{B_{2}} = 35^{o}$ ","D. T\u1ea5t c\u1ea3 c\u00e1c \u0111\u00e1p \u00e1n tr\u00ean \u0111\u1ec1u \u0111\u00fang "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>+ $\\widehat{A_{2}} = \\widehat{A_{4}}$ (c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh)<br\/>M\u00e0 $\\widehat{A_{2}} = 35^{o}$ (gt)<br\/>$\\Rightarrow$ $\\widehat{A_{4}} = 35^{o}$<br\/>+ $\\widehat{A_{2}} + \\widehat{A_{3}} = 180^{o}$ (hai g\u00f3c k\u1ec1 b\u00f9)<br\/>$\\Rightarrow$ $\\widehat{A_{3}} = 180^{o} - \\widehat{A_{2}} = 180^{o} - 35^{o} = 145^{o}$<br\/>+ $\\widehat{B_{4}} = \\widehat{B_{2}}$ (c\u1eb7p g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh)<br\/>L\u1ea1i c\u00f3: $\\widehat{B_{4}} = 35^{o}$ (gi\u1ea3 thi\u1ebft)<br\/>$\\Rightarrow$ $\\widehat{B_{2}} = 35^{o}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> D. T\u1ea5t c\u1ea3 c\u00e1c \u0111\u00e1p \u00e1n tr\u00ean \u0111\u1ec1u \u0111\u00fang<\/span><\/span> <br\/><\/span>","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:00"},{"id":"1512","post_id":"1022","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":"Cho h\u00ecnh v\u1ebd, bi\u1ebft AB \/\/ MD; BC \/\/ EM. Khi \u0111\u00f3: <center><img src='img\/H7C17-32.png' \/> <\/center> ","select":["A. $\\widehat{AEM} = \\widehat{MDC}$ ","B. $\\widehat{BAM} = \\widehat{AMD}$","C. $\\widehat{ABC} < \\widehat{DME}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> AB \/\/ MD (gi\u1ea3 thi\u1ebft)<br\/>$\\Rightarrow$ + $\\widehat{ABC} = \\widehat{MDC}$ (c\u1eb7p g\u00f3c \u0111\u1ed3ng v\u1ecb) (1)<br\/> + $ \\widehat{BAM} + \\widehat{AMD} = 180^{o}$ ( c\u1eb7p g\u00f3c trong c\u00f9ng ph\u00eda) <span class='basic_pink'> $\\Rightarrow$ \u0111\u00e1p \u00e1n B sai<\/span><br\/> + $\\widehat{ABC} + \\widehat{BDM} = 180^{o}$ ( c\u1eb7p g\u00f3c trong c\u00f9ng ph\u00eda) (2) <br\/>BC \/\/ EM (gt) <br\/>$\\Rightarrow$ + $\\widehat{ABC} = \\widehat{AEM}$ (c\u1eb7p g\u00f3c \u0111\u1ed3ng v\u1ecb) (3)<br\/> + $\\widehat{EMD} + \\widehat{BDM} = 180^{o}$ ( c\u1eb7p g\u00f3c trong c\u00f9ng ph\u00eda) (4)<br\/>T\u1eeb (1) v\u00e0 (3) $\\Rightarrow$ $\\widehat{AEM} = \\widehat{MDC}$ <span class='basic_pink'>(\u0111\u00e1p \u00e1n A \u0111\u00fang)<\/span><br\/>T\u1eeb (2) v\u00e0 (4) $\\Rightarrow$ $\\widehat{ABC} = \\widehat{EMD}$ <span class='basic_pink'>(\u0111\u00e1p \u00e1n C sai)<\/span><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A. $\\widehat{AEM} = \\widehat{MDC}$<\/span><\/span> <br\/><\/span>","column":3}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:23:00"},{"id":"1513","post_id":"1022","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":[[3]],"list":[{"point":5,"ques":"Ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi sai. <br\/> Tr\u00ean h\u00ecnh v\u1ebd, bi\u1ebft Dx l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c $\\widehat{mDn} $ <br\/> Ta c\u00f3 Dx \/\/ HK khi: <center><img src='img\/H7C17-31.png' \/> <\/center> ","select":["A. $\\widehat{mDx} = \\widehat{DKH}$ ","B. $\\widehat{xDK} = \\widehat{DKH}$","C. $\\widehat{xDK} = \\widehat{nKH}$ ","D. $\\widehat{mDx} = \\widehat{DHK}$ "],"hint":"","explain":" <span class='basic_left'>Ta c\u00f3: Dx l\u00e0 tia ph\u00e2n gi\u00e1c c\u1ee7a $\\widehat{mDn}$ ( gi\u1ea3 thi\u1ebft) <br\/>$\\Rightarrow$ $\\widehat{mDx} = \\widehat{xDK}$ (1)<br\/>L\u1ea1i c\u00f3: Dx \/\/ HK (gi\u1ea3 thi\u1ebft)<br\/>$\\Rightarrow$ $\\widehat{xDK} = \\widehat{DKH}$ (c\u1eb7p g\u00f3c so le trong) (2) <span class='basic_pink'>(\u0111\u00e1p \u00e1n B \u0111\u00fang)<\/span><br\/> $\\widehat{mDx} = \\widehat{DHK}$ (c\u1eb7p g\u00f3c \u0111\u1ed3ng v\u1ecb) <span class='basic_pink'>(\u0111\u00e1p \u00e1n D \u0111\u00fang)<\/span><br\/>T\u1eeb (1) v\u00e0 (2) $\\Rightarrow$ $\\widehat{mDx} = \\widehat{DKH}$ <span class='basic_pink'>(\u0111\u00e1p \u00e1n A \u0111\u00fang)<\/span><br\/>\u0110\u00e1p \u00e1n C sai v\u00ec: $\\widehat{xDK} + \\widehat{nKH} = 180^{o}$<br\/>V\u1eady \u0111\u00e1p \u00e1n sai l\u00e0: <span class='basic_pink'>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 09:23:00"}]}