{"common":{"save":0,"post_id":"767","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1031","post_id":"767","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\u1ed5ng c\u1ee7a 91025 v\u00e0 (-84215) l\u00e0: ","select":["A. 6710","B. -6710 ","C. 6810","D. -6810"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u1ed5ng t\u1ee9c l\u00e0 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh c\u1ed9ng.<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>T\u1ed5ng c\u1ee7a 91025 v\u00e0 (-84215) l\u00e0:<br\/> $\\begin{align*}91025 + (-84215)&= (91025 - 84215) \\\\&= 6810\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. 6810<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:48"},{"id":"1032","post_id":"767","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":10,"ques":" <center><img src='img\/4.jpg'\/><\/center> T\u1ed5ng c\u1ee7a (-5210) v\u00e0 374 c\u1ed9ng (-2471) \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: ","select":["A. -7307","B. 7307 ","C. 8055","D. -8055"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u1ed5ng t\u1ee9c l\u00e0 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh c\u1ed9ng.<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>T\u1ed5ng c\u1ee7a (-5210) v\u00e0 374 c\u1ed9ng (-2471) \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0:<br\/> $\\begin{align*}(-5210) + 374 + (-2471)&= - (5210 - 374) + (-2471) \\\\&= (-4836) + (-2471)\\\\&= - (4836 + 2471)\\\\&= -7307\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. -7307<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:48"},{"id":"1033","post_id":"767","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":10,"ques":" T\u00ednh t\u1ed5ng c\u00e1c s\u1ed1 nguy\u00ean x, bi\u1ebft: -100 $\\le$ x < 101 ","select":["A. 0","B. 100 ","C. -100","D. 101"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ecm c\u00e1c s\u1ed1 nguy\u00ean x th\u1ecfa m\u00e3n-100 $\\le$ x < 101<br\/>B\u01b0\u1edbc 2: T\u00ednh t\u1ed5ng c\u00e1c s\u1ed1 nguy\u00ean x v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c \u1edf b\u01b0\u1edbc 1<br\/><b>L\u01b0u \u00fd: <\/b> <i>Hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau c\u00f3 t\u1ed5ng b\u1eb1ng 0<\/i><\/span> <br\/><br\/><span class='basic_left'> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: -100 $\\le$ x < 101 $\\Rightarrow $ x $ \\in$ { -100; -99; -98; ...; 98; 99; 100}<br\/> T\u1ed5ng c\u1ee7a c\u00e1c s\u1ed1 nguy\u00ean x l\u00e0:<br\/>$\\begin{align*}&(-100) + (-99) + (-98) + ... + 98 + 99 + 100 \\\\&= [(-100) + 100] + [(-99) + 99] + [(-98) + 98] +...+ 0 \\\\&= 0 + 0 + 0 +...+ 0\\\\&= 0\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. 0<\/span><\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:48"}]}