{"common":{"save":0,"post_id":"1014","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"401","post_id":"1014","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":" <center><img src='img\/2.jpg' \/><\/center> T\u00ecm c\u0103n b\u1eadc hai c\u1ee7a 49 ","select":["A. 7 ","B. $\\pm 7$ ","C. 98 ","D. 2401"],"hint":"M\u1ed9t s\u1ed1 d\u01b0\u01a1ng a c\u00f3 hai c\u0103n b\u1eadc hai l\u00e0 $\\sqrt{a}$ v\u00e0 $-\\sqrt{a}$","explain":" C\u0103n b\u1eadc hai c\u1ee7a 49 l\u00e0 $ 7$ v\u00e0 $-7.$ V\u00ec ta c\u00f3: $7^2 = (- 7)^{2} = 49$ <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 09:22:47"},{"id":"402","post_id":"1014","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":" <center><img src='img\/2.jpg' \/><\/center> Ch\u1ecdn c\u00e2u \u0111\u00fang trong c\u00e1c c\u00e1ch vi\u1ebft sau: ","select":["A. $\\sqrt{9} = 3 $ ","B. $\\sqrt{9} = -3 $ ","C. $-\\sqrt{9} = 3 $ ","D. $\\sqrt{9} = \\pm 3 $ "],"explain":" Ta c\u00f3: $\\sqrt{9} = 3 $ (v\u00ec 3 > 0 v\u00e0 $3^{2} = 9$) <br\/> $-\\sqrt{9} = -3 $ v\u00ec (-3 < 0 v\u00e0 $(-3)^{2} = 9$) <br\/>Suy ra k\u1ebft qu\u1ea3 \u0111\u00fang l\u00e0: $\\sqrt{9} = 3 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:47"},{"id":"403","post_id":"1014","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 $x$ bi\u1ebft: $\\sqrt{x} = 2 $ ","select":["A. $ x = 2 $ ","B. $ x = 1 $","C. $ x = 4 $","D. $ x = 8 $"],"hint":"\u00c1p d\u1ee5ng: N\u1ebfu $\\sqrt{x} = a (a \\geq 0)$ th\u00ec $x = a^{2}$ ","explain":" Ta c\u00f3 $\\sqrt{x} = 2 \\Rightarrow x = 2^{2} = 4 $ <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 09:22:47"}]}