{"common":{"save":0,"post_id":"785","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1321","post_id":"785","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":10,"ques":" <center><img src='img\/2.jpg' \/><\/center>T\u00ecm n, bi\u1ebft: (n + 4) $\\vdots$ (n + 1)","select":["A. n $\\in$ {4; -2; 0; 2}","B. n $\\in$ {-4; -2; 0; 2}","C. n $\\in$ { -4; -2; 1; 2}","D. n $\\in$ {-4; -2; 0; 4}"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Ph\u00e2n t\u00edch n + 4 v\u1ec1 d\u1ea1ng a.(n + 1) + b, (a, b $\\in $ Z, a $\\ne$ 0)<br\/>B\u01b0\u1edbc 2: T\u00ecm n<\/span> <br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: n + 4 = (n + 1) + 3<br\/>M\u00e0 (n + 4) $\\vdots$ (n + 1)<br\/>$\\Rightarrow$ (n + 1) + 3 $\\vdots$ (n + 1)<br\/>L\u1ea1i c\u00f3: (n + 1) $\\vdots$ (n + 1) v\u1edbi m\u1ecdi n<br\/> $\\Rightarrow$ 3 $\\vdots$ (n + 1) hay (n + 1) $\\in$ \u01af(3)<br\/>\u01af(3) = {-3; -1; 1; 3}<br\/> $\\Rightarrow$ (n + 1) $\\in$ {-3; -1; 1; 3}<br\/>$\\Rightarrow$ n $\\in$ {-4; -2; 0; 2}<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. n $\\in$ {-4; -2; 0; 2}<\/span><\/span> <br\/><\/span><span class='basic_left'><span class='basic_green'>Nh\u1eadn x\u00e9t: <\/span><b> N\u1ebfu a + b chia h\u1ebft cho c v\u00e0 a chia h\u1ebft cho c th\u00ec b chia h\u1ebft cho c <\/b><\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:50"},{"id":"1322","post_id":"785","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":10,"ques":" <center><img src='img\/5.jpg' \/><\/center>T\u00ecm n, bi\u1ebft: (2n + 9) $\\vdots$ (n + 2)","select":["A. n $\\in$ {-7; -3; 1; 3}","B. n $\\in$ {-7; -3; -1; 3}","C. n $\\in$ {-7; 1; -1; 3}","D. n $\\in$ {-7; -3; -1; 7}"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Ph\u00e2n t\u00edch 2n + 9 v\u1ec1 d\u1ea1ng a.(n + 2) + b, (a, b $\\in $ Z, a $\\ne$ 0)<br\/>B\u01b0\u1edbc 2: T\u00ecm n<\/span> <br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: 2n + 9 = 2.(n + 2) + 5<br\/>M\u00e0 (2n + 9) $\\vdots$ (n + 2)<br\/>$\\Rightarrow$ 2(n + 2) + 5 $\\vdots$ (n + 2)<br\/>L\u1ea1i c\u00f3: 2.(n + 2) $\\vdots$ (n + 2) v\u1edbi m\u1ecdi n<br\/> $\\Rightarrow$ 5 $\\vdots$ (n + 2) hay (n + 2) $\\in$ \u01af(5)<br\/>\u01af(5) = {-5; -1; 1; 5}<br\/> $\\Rightarrow$ (n + 2) $\\in$ {-5; -1; 1; 5}<br\/>$\\Rightarrow$ n $\\in$ {-7; -3; -1; 3}<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. n $\\in$ {-7; -3; -1; 3}<\/span><\/span> <br\/><\/span><span class='basic_left'><span class='basic_green'>Nh\u1eadn x\u00e9t: <\/span><b> N\u1ebfu a + b chia h\u1ebft cho c v\u00e0 a chia h\u1ebft cho c th\u00ec b chia h\u1ebft cho c <\/b><\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:50"},{"id":"1323","post_id":"785","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":10,"ques":" <center><img src='img\/4.jpg' \/><\/center>T\u00ecm b $\\in$ Z sao cho -10 l\u00e0 b\u1ed9i c\u1ee7a b + 6","select":["A. b $\\in$ {-4; -11; -6; -7; -5; -4; -1; 4}","B. b $\\in$ {-4; 1; 4; 5; 7; 8; 11; 16}","C. b $\\in$ {-16; -11; -8; -7; -5; -4; -1; 4}","D. b $\\in$ {-16; -11; -8; -7; 7; 8; 11; 16}"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>-10 l\u00e0 b\u1ed9i c\u1ee7a b + 6<br\/>$\\Rightarrow$ -10 $\\vdots$ (b + 6)<\/span> <br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: -10 l\u00e0 b\u1ed9i c\u1ee7a b + 6<br\/>$\\Rightarrow$ -10 $\\vdots$ (b + 6) hay (b + 6) $\\in$ \u01af(-10)<br\/>\u01af(-10) = {-10; -5; -2; -1; 1; 2; 5; 10}<br\/> $\\Rightarrow$ (b + 6) $\\in$ {-10; -5; -2; -1; 1; 2; 5; 10}<br\/>$\\Rightarrow$ b $\\in$ {-16; -11; -8; -7; -5; -4; -1; 4}<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. b $\\in$ {-16; -11; -8; -7; -5; -4; -1; 4}<\/span><\/span> <br\/><\/span>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:50"}]}