{"segment":[{"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":" Khi ch\u1ee9ng minh m\u1ed9t \u0111\u1ecbnh l\u00fd, ng\u01b0\u1eddi ta c\u1ea7n: ","select":["A. Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd \u0111\u00f3 \u0111\u00fang trong m\u1ed9t tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3 c\u1ee7a gi\u1ea3 thi\u1ebft. ","B. Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd \u0111\u00f3 \u0111\u00fang trong hai tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3 c\u1ee7a gi\u1ea3 thi\u1ebft.","C. Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd \u0111\u00f3 \u0111\u00fang trong m\u1ecdi tr\u01b0\u1eddng h\u1ee3p c\u00f3 th\u1ec3 x\u1ea3y ra c\u1ee7a gi\u1ea3 thi\u1ebft.","D. Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd \u0111\u00f3 \u0111\u00fang trong v\u00e0i tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3 c\u1ee7a gi\u1ea3 thi\u1ebft. "],"hint":"","explain":" Khi ch\u1ee9ng minh m\u1ed9t \u0111\u1ecbnh l\u00fd, ng\u01b0\u1eddi ta c\u1ea7n: <br\/> Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd \u0111\u00f3 \u0111\u00fang trong m\u1ecdi tr\u01b0\u1eddng h\u1ee3p c\u00f3 th\u1ec3 x\u1ea3y ra c\u1ee7a gi\u1ea3 thi\u1ebft. <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span> ","column":1}]}],"id_ques":1481},{"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":" Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd l\u00e0: ","select":["A. D\u00f9ng l\u1eadp lu\u1eadn \u0111\u1ec3 t\u1eeb gi\u1ea3 thi\u1ebft suy ra k\u1ebft lu\u1eadn. ","B. D\u00f9ng l\u1eadp lu\u1eadn \u0111\u1ec3 t\u1eeb k\u1ebft lu\u1eadn suy ra gi\u1ea3 thi\u1ebft. ","C. D\u00f9ng h\u00ecnh v\u1ebd \u0111\u1ec3 suy ra k\u1ebft lu\u1eadn. ","D. D\u00f9ng \u0111o \u0111\u1ea1c tr\u1ef1c ti\u1ebfp \u0111\u1ec3 suy ra k\u1ebft lu\u1eadn. "],"hint":"","explain":" Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd l\u00e0: D\u00f9ng l\u1eadp lu\u1eadn \u0111\u1ec3 t\u1eeb gi\u1ea3 thi\u1ebft suy ra k\u1ebft lu\u1eadn. <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span> ","column":1}]}],"id_ques":1482},{"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":" Trong \u0111\u1ecbnh l\u00fd ''Hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh th\u00ec b\u1eb1ng nhau''. <br\/> Ta c\u00f3 gi\u1ea3 thi\u1ebft c\u1ee7a \u0111\u1ecbnh l\u00fd l\u00e0: <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-20.png' \/><\/center> ","select":["A. a c\u1eaft b t\u1ea1i O ","B. $\\widehat{O_{1}} $ v\u00e0 $\\widehat{O_{2}} $ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. ","C. $\\widehat{O_{1}} $ v\u00e0 $\\widehat{O_{2}} $ l\u00e0 hai g\u00f3c b\u1eb1ng nhau. ","D. $\\widehat{O_{1}} $ v\u00e0 $\\widehat{O_{2}} $ l\u00e0 hai g\u00f3c nh\u1ecdn "],"hint":"","explain":" Gi\u1ea3 thi\u1ebft c\u1ee7a \u0111\u1ecbnh l\u00fd l\u00e0: $\\widehat{O_{1}} $ v\u00e0 $\\widehat{O_{2}} $ l\u00e0 hai g\u00f3c \u0111\u1ed1i \u0111\u1ec9nh. <br\/> K\u1ebft lu\u1eadn l\u00e0: $ \\widehat{O_{1}} = \\widehat{O_{2}}$ <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span> ","column":2}]}],"id_ques":1483},{"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":" Cho bi\u1ebft $a \\perp b, b \/\/ c $. Khi \u0111\u00f3: ","select":["A. a c\u1eaft c t\u1ea1o th\u00e0nh m\u1ed9t g\u00f3c t\u00f9","B. $a \\perp c $ ","C. $a \\equiv c $ ","D. a \/\/ c "],"hint":"V\u1ebd h\u00ecnh \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n \u0111\u00fang ","explain":" \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B . <br\/> N\u1ebfu $a \\perp b, b \/\/ c $ th\u00ec $ a \\perp c $ ","column":2}]}],"id_ques":1484},{"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 \u0111\u1ecbnh l\u00fd ''N\u1ebfu hai \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng th\u1ee9 ba t\u1ea1o th\u00e0nh hai g\u00f3c trong c\u00f9ng ph\u00eda b\u00f9 nhau th\u00ec hai \u0111\u01b0\u1eddng th\u1eb3ng \u1ea5y song song.'' <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-16A.png' \/><\/center> Gi\u1ea3 thi\u1ebft v\u00e0 K\u1ebft lu\u1eadn c\u1ee7a \u0111\u1ecbnh l\u00fd n\u00e0y l\u00e0: <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-16B.jpg' \/><\/center> ","select":["H\u00ecnh 1 ","H\u00ecnh 2 "],"hint":"","explain":" \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 H\u00ecnh 1. ","column":2}]}],"id_ques":1485},{"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":" Cho \u0111\u1ecbnh l\u00fd ''Hai tia ph\u00e2n gi\u00e1c c\u1ee7a hai g\u00f3c k\u1ec1 b\u00f9 t\u1ea1o th\u00e0nh m\u1ed9t g\u00f3c vu\u00f4ng.'' <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-15A.png' \/><\/center> <br\/> Gi\u1ea3 thi\u1ebft v\u00e0 K\u1ebft lu\u1eadn c\u1ee7a \u0111\u1ecbnh l\u00fd n\u00e0y l\u00e0: <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-15B.png' \/><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-15C.png' \/><\/center> ","select":["B\u1ea3ng 1 ","B\u1ea3ng 2 "],"hint":"","explain":"Gi\u1ea3 thi\u1ebft, K\u1ebft lu\u1eadn c\u1ee7a \u0111\u1ecbnh l\u00fd tr\u00ean l\u00e0: <br\/><center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-15C.png' \/><\/center> ","column":2}]}],"id_ques":1486},{"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":" \u0110i\u1ec1n ti\u1ebfp v\u00e0o ch\u1ed7 '' ... '' \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u1ecbnh l\u00fd. <br\/> ''Hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng th\u1ee9 ba th\u00ec ... '' ","select":["A. song song v\u1edbi nhau ","B. vu\u00f4ng g\u00f3c v\u1edbi nhau ","C. c\u1eaft nhau ","D. tr\u00f9ng nhau "],"hint":"","explain":"Ta c\u00f3 \u0111\u1ecbnh l\u00fd l\u00e0: <br\/> ''Hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng th\u1ee9 ba th\u00ec song song v\u1edbi nhau. '' <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span>","column":2}]}],"id_ques":1487},{"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'> Trong \u0111\u1ecbnh l\u00fd ''N\u1ebfu m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft hai \u0111\u01b0\u1eddng th\u1eb3ng song song th\u00ec hai g\u00f3c so le trong b\u1eb1ng nhau.'' <br\/> K\u1ebft lu\u1eadn c\u1ee7a \u0111\u1ecbnh l\u00fd l\u00e0: <\/span> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-14.png' \/><\/center> ","select":["A. '' a \/\/ b '' ","B. '' $\\widehat{A_{1}} = \\widehat{B_{1}} $ '' ","C. '' $\\widehat{A_{1}} $ v\u00e0 $\\widehat{B_{1}} $ l\u00e0 hai g\u00f3c \u0111\u1ed3ng v\u1ecb '' ","D. '' c c\u1eaft a, c c\u1eaft b '' "],"hint":"","explain":" Gi\u1ea3 thi\u1ebft c\u1ee7a \u0111\u1ecbnh l\u00fd l\u00e0: '' a \/\/ b '' <br\/> K\u1ebft lu\u1eadn l\u00e0 '' $\\widehat{A_{1}} = \\widehat{B_{1}} $ '' <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span>","column":1}]}],"id_ques":1488},{"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":" <span class='basic_left'> Trong \u0111\u1ecbnh l\u00fd ''N\u1ebfu m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft hai \u0111\u01b0\u1eddng th\u1eb3ng sao cho c\u00f3 m\u1ed9t c\u1eb7p g\u00f3c so le trong b\u1eb1ng nhau th\u00ec hai \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3 song song.'' <br\/> Ta c\u00f3 gi\u1ea3 thi\u1ebft c\u1ee7a \u0111\u1ecbnh l\u00fd l\u00e0: <\/span> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-13.png' \/><\/center> ","select":["A. '' $\\widehat{A_{1}} $ v\u00e0 $\\widehat{B_{3}} $ l\u00e0 hai g\u00f3c \u0111\u1ed3ng v\u1ecb '' ","B. '' c c\u1eaft a v\u00e0 b '' ","C. '' $\\widehat{A_{1}} $ v\u00e0 $\\widehat{B_{1}} $ l\u00e0 hai g\u00f3c so le trong b\u1eb1ng nhau, c c\u1eaft a v\u00e0 b l\u1ea7n l\u01b0\u1ee3t t\u1ea1i A v\u00e0 B '' "],"hint":"","explain":" Gi\u1ea3 thi\u1ebft c\u1ee7a \u0111\u1ecbnh l\u00fd l\u00e0: '' $\\widehat{A_{1}} $ v\u00e0 $\\widehat{B_{1}} $ l\u00e0 hai g\u00f3c so le trong b\u1eb1ng nhau, c c\u1eaft a v\u00e0 b l\u1ea7n l\u01b0\u1ee3t t\u1ea1i A v\u00e0 B '' <br\/> K\u1ebft lu\u1eadn l\u00e0 '' a \/\/ b '' <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span>","column":1}]}],"id_ques":1489},{"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":" Cho ba \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t a, b, c. <br\/> Hai \u0111\u01b0\u1eddng th\u1eb3ng a v\u00e0 b song song v\u1edbi nhau khi: ","select":["A. a v\u00e0 b c\u00f9ng c\u1eaft c ","B. $a \\perp c $ v\u00e0 $b \\perp c $","C. a c\u1eaft c v\u00e0 $b \\perp c $","D. $a \\perp c $ v\u00e0 b c\u1eaft c "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm ra \u0111\u00e1p \u00e1n.","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-24.png' \/><\/center> Hai \u0111\u01b0\u1eddng th\u1eb3ng a v\u00e0 b song song v\u1edbi nhau khi: $a \\perp c $ v\u00e0 $b \\perp c $ <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span>","column":2}]}],"id_ques":1490},{"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":" M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1ed9t trong hai \u0111\u01b0\u1eddng th\u1eb3ng song song th\u00ec \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3: ","select":["A. vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng c\u00f2n l\u1ea1i","B. tr\u00f9ng v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng c\u00f2n l\u1ea1i ","C. c\u1eaft \u0111\u01b0\u1eddng th\u1eb3ng c\u00f2n l\u1ea1i t\u1ea1o th\u00e0nh m\u1ed9t g\u00f3c t\u00f9 ","D. song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng c\u00f2n l\u1ea1i "],"hint":"Xem quan h\u1ec7 gi\u1eefa t\u00ednh vu\u00f4ng g\u00f3c v\u1edbi t\u00ednh song song","explain":" \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A . <br\/>M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1ed9t trong hai \u0111\u01b0\u1eddng th\u1eb3ng song song th\u00ec \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3: <br\/> vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng c\u00f2n l\u1ea1i. ","column":1}]}],"id_ques":1491},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["120"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Cho hai \u0111\u01b0\u1eddng th\u1eb3ng xx' v\u00e0 yy'. Tr\u00ean xx' v\u00e0 yy' l\u1ea7n l\u01b0\u1ee3t l\u1ea5y hai \u0111i\u1ec3m A, B sao cho $AB \\perp yy'$ t\u1ea1i B, vu\u00f4ng g\u00f3c v\u1edbi xx' t\u1ea1i A. Tr\u00ean By' l\u1ea5y \u0111i\u1ec3m C. Tr\u00ean tia Ax' l\u1ea5y \u0111i\u1ec3m D sao cho $\\widehat{BCD} = 120^{o} $<br\/> S\u1ed1 \u0111o g\u00f3c $\\widehat{CDx'} $ l\u00e0: $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o}$<\/span>","hint":"Ch\u1ee9ng minh xx' song song v\u1edbi yy' \u0111\u1ec3 c\u00f3 c\u1eb7p g\u00f3c so le trong b\u1eb1ng nhau","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-10.png' \/><\/center> Ta c\u00f3 $AB \\perp yy' \\\\ AB \\perp xx' $ <br\/> n\u00ean xx' \/\/ yy' <br\/> Suy ra $\\widehat{CDx'} = \\widehat{BCD} = 120^{o} $ (c\u1eb7p g\u00f3c so le trong b\u1eb1ng nhau)<br\/> <br\/> <span class='basic_pink'> V\u1eady $ \\widehat{CDx'} = 120^{o}$<\/span> "}]}],"id_ques":1492},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["90"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Cho tam gi\u00e1c ABC vu\u00f4ng t\u1ea1i A. C\u00f3 $\\widehat{ACB} = 30^{o} $ . Tr\u00ean n\u1eeda m\u1eb7t ph\u1eb3ng b\u1edd BC kh\u00f4ng ch\u1ee9a A, k\u1ebb tia Bx h\u1ee3p v\u1edbi BC m\u1ed9t g\u00f3c $30^{o} $ <br\/> S\u1ed1 \u0111o g\u00f3c $\\widehat{ABx} $ l\u00e0: $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}^{o}$<\/span>","hint":"","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-09.png' \/><\/center> Ta c\u00f3 $\\widehat{ACB} = \\widehat{CBx} = 30^{o} $(gi\u1ea3 thi\u1ebft) <br\/> M\u00e0 $\\widehat{ACB} $ v\u00e0 $\\widehat{CBx}$ l\u00e0 hai g\u00f3c so le trong t\u1ea1o b\u1edfi \u0111\u01b0\u1eddng th\u1eb3ng BC c\u1eaft hai \u0111\u01b0\u1eddng th\u1eb3ng AC, Bx n\u00ean AC \/\/ Bx <br\/> M\u1eb7t kh\u00e1c, c\u00f3 $\\widehat{BAC} = 90^{o} $(do tam gi\u00e1c ABC vu\u00f4ng t\u1ea1i A) n\u00ean $AC \\perp AB$<br\/> Suy ra $Bx \\perp AB $ (quan h\u1ec7 gi\u1eefa t\u00ednh vu\u00f4ng g\u00f3c v\u1edbi t\u00ednh song song) <br\/> <br\/> <span class='basic_pink'> V\u1eady $ \\widehat{ABx} = 90^{o}$<\/span> "}]}],"id_ques":1493},{"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":" \u0110i\u1ec1n v\u00e0o ch\u1ed7 (...) trong c\u00e2u sau: <br\/> N\u1ebfu a \/\/ c v\u00e0 ... th\u00ec a \/\/ b ","select":["A. b \/\/ c ","B. $b \\perp c $ ","C. $a \\perp b $ ","D. b c\u1eaft c "],"hint":"V\u1ebd h\u00ecnh \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n \u0111\u00fang ","explain":" \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <br\/> N\u1ebfu a \/\/ c v\u00e0 b \/\/ c th\u00ec a \/\/ b ","column":2}]}],"id_ques":1494},{"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":" \u0110i\u1ec1n v\u00e0o ch\u1ed7 (...) trong c\u00e2u sau: <br\/> N\u1ebfu $c \\perp a$ v\u00e0 ... th\u00ec c \/\/ b ","select":["A. $c \\perp b$","B. $ a \\perp b$ ","C. a \/\/ b ","D. a c\u1eaft b "],"hint":"V\u1ebd h\u00ecnh \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n \u0111\u00fang ","explain":" \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <br\/> N\u1ebfu $c \\perp a$ v\u00e0 $ a \\perp b$ th\u00ec c \/\/ b <\/span>","column":2}]}],"id_ques":1495},{"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":" V\u1ebd ba \u0111\u01b0\u1eddng th\u1eb3ng a, b, c sao cho a \/\/ b \/\/ c. <br\/> N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng d vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng a th\u00ec: ","select":["A. $d \\perp b$","B. $d \\perp c$ ","C. $d \\perp b$ ho\u1eb7c $d \\perp c$","D. $d \\perp b$ v\u00e0 $d \\perp c $"],"hint":"V\u1ebd h\u00ecnh \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n \u0111\u00fang ","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-25.png' \/><\/center> <br\/> Ta c\u00f3 a \/\/ b \/\/ c. <br\/> N\u1ebfu $d \\perp a $ th\u00ec $d \\perp b$ v\u00e0 $d \\perp c $ <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span>","column":2}]}],"id_ques":1496},{"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":" Cho c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng a, b, c ph\u00e2n bi\u1ec7t. N\u1ebfu a \/\/ b v\u00e0 a c\u1eaft c th\u00ec: ","select":["A. $b \\perp c$","B. b \/\/ c ","C. b c\u1eaft c ","D. $ b \\equiv c$ "],"hint":"V\u1ebd h\u00ecnh \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n \u0111\u00fang ","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-04.png' \/><\/center> <br\/> N\u1ebfu a \/\/ b v\u00e0 a c\u1eaft c th\u00ec: b c\u1eaft c <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span>","column":2}]}],"id_ques":1497},{"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":" Bi\u1ebft a, b, c l\u00e0 c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t","select":["A. N\u1ebfu $a \\perp b$ m\u00e0 $b \\perp c$ th\u00ec $a \\perp c$","B. N\u1ebfu a \/\/ b m\u00e0 $c \\perp a $ th\u00ec $c \\perp b$","C. N\u1ebfu a \/\/ b m\u00e0 c \/\/a th\u00ec c c\u1eaft b","D. N\u1ebfu a \/\/ b m\u00e0 c \/\/ a th\u00ec $c \\perp b$ "],"hint":"V\u1ebd h\u00ecnh \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n \u0111\u00fang ","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-01.png' \/><\/center> <br\/> C\u00e2u \u0111\u00fang l\u00e0 B. <br\/> N\u1ebfu a \/\/ b m\u00e0 $c \\perp a $ th\u00ec $c \\perp b$ <br\/> <br\/> <span class='basic_pink'>Ch\u1ecdn \u0111\u00e1p \u00e1n B. <\/span>","column":2}]}],"id_ques":1498},{"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":" Ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang. <span class='basic_left'>Cho b\u1ed1n \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t m, n, p v\u00e0 q. <br\/> Bi\u1ebft m song song v\u1edbi n, p vu\u00f4ng g\u00f3c v\u1edbi m v\u00e0 q vu\u00f4ng g\u00f3c v\u1edbi n. Khi \u0111\u00f3: <\/span> ","select":["A. p \/\/ q","B. $p \/\/ n $ ","C. $q \/\/ m $ ","D. $ p \\perp q$ "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm ra \u0111\u00e1p \u00e1n.","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-03.png' \/><\/center> <br\/> C\u00e2u sai l\u00e0 D. <br\/> V\u00ec m\/\/n n\u00ean p vu\u00f4ng g\u00f3c v\u1edbi n. Do \u0111\u00f3 p \/\/ q <br\/> <br\/> <span class='basic_pink'>Ch\u1ecdn \u0111\u00e1p \u00e1n A. <\/span>","column":2}]}],"id_ques":1499},{"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":" <span class='basic_left'>Cho ba \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t a, b, c. Hai \u0111\u01b0\u1eddng th\u1eb3ng a v\u00e0 b song song v\u1edbi nhau khi: <br\/> (I). $a \\perp c $ v\u00e0 $b \\perp c $ <br\/> (II). a \/\/ c v\u00e0 b \/\/ c <\/span> ","select":["A. Ch\u1ec9 c\u00f3 (I) \u0111\u00fang ","B. Ch\u1ec9 c\u00f3 (II) \u0111\u00fang","C. C\u1ea3 (I) v\u00e0 (II) \u0111\u1ec1u \u0111\u00fang","D. C\u1ea3 (I) v\u00e0 (II) \u0111\u1ec1u sai"],"hint":"","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/hinhhoc/bai6/lv1/img\/H7C16-02.png' \/><\/center> <br\/> Hai \u0111\u01b0\u1eddng th\u1eb3ng a v\u00e0 b song song v\u1edbi nhau khi: <br\/> (I). $a \\perp c $ v\u00e0 $b \\perp c $ <br\/> (II). a \/\/ c v\u00e0 b \/\/ c <br\/> <br\/> <span class='basic_pink'>\u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span>","column":2}]}],"id_ques":1500}],"lesson":{"save":0,"level":1}}