{"common":{"save":0,"post_id":"1024","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"501","post_id":"1024","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":" <center><img src='img\/2.jpg' \/><\/center> T\u00ecm $x \\in \\mathbb{Q}$ bi\u1ebft $\\dfrac{-2}{3}x = \\left(\\dfrac{-1}{3}\\right)^{2} $ ","select":["A. $x = \\dfrac{1}{6} $ ","B. $x = \\dfrac{-2}{27} $ ","C. $x = \\dfrac{-1}{6} $","D. $x = \\dfrac{2}{27} $"],"hint":"L\u01b0u \u00fd: $(-a)^{n} = a^{n}$ n\u1ebfu n ch\u1eb5n ","explain":" Ta c\u00f3: $\\dfrac{-2}{3}x = \\left(\\dfrac{-1}{3}\\right)^{2} \\\\ \\Leftrightarrow \\dfrac{-2}{3}x = \\dfrac{1}{9} \\\\ \\Leftrightarrow x = \\dfrac{1}{9} : \\dfrac{-2}{3} \\\\ \\Leftrightarrow x = \\dfrac{-1}{6} $ <br\/> <br\/> <span class='basic_pink'> \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 09:22:48"},{"id":"502","post_id":"1024","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":" Gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c $P = \\dfrac{-5}{37} + \\dfrac{-4}{13} + \\dfrac{5}{37} + \\dfrac{-9}{13}$ l\u00e0: ","select":["A. $1$ ","B. $-1$ ","C. $0$","D. $2$ "],"hint":" Nh\u00f3m s\u1ed1 h\u1ea1ng m\u1ed9t c\u00e1ch h\u1ee3p l\u00ed r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh.","explain":" Ta c\u00f3: $P = \\dfrac{-5}{37} + \\dfrac{-4}{13} + \\dfrac{5}{37} + \\dfrac{-9}{13} \\\\ = \\left(\\dfrac{-5}{37} + \\dfrac{5}{37} \\right) + \\left(\\dfrac{-4}{13} + \\dfrac{-9}{13}\\right) \\\\ = 0 + (-1) \\\\ = -1 $ <br\/> <br\/> <span class='basic_pink'> \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 09:22:48"},{"id":"503","post_id":"1024","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":" Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh $Q = -3,94 . 0,5 . (-0,4) . 2,5 . (-2)$ b\u1eb1ng:","select":["A. $-3,94 $ ","B. $3,94$ ","C. $39,4$","D. $-39,4$ "],"hint":" Nh\u00f3m s\u1ed1 h\u1ea1ng m\u1ed9t c\u00e1ch h\u1ee3p l\u00ed r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh.","explain":" Ta c\u00f3: $Q = -3,94 . 0,5 . (-0,4) . 2,5 . (-2) \\\\ = -3,94 . (-0,4 . 2,5) . (0,5 . (-2)) \\\\ = -3,94 . (-1) . (-1) \\\\ = -3,94 $ <br\/> <br\/> <span class='basic_pink'> \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 09:22:48"}]}