{"common":{"save":0,"post_id":"770","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1081","post_id":"770","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["3341"]]],"list":[{"point":10,"width":60,"type_input":"","ques":"<center><img src='img\/2.jpg' \/><\/center> 2000 + (-570) + 2341 + (-430) = _input_","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n, t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng c\u00e1c s\u1ed1 nguy\u00ean \u0111\u1ec3 nh\u00f3m c\u00e1c c\u1eb7p s\u1ed1 \u0111\u1ed1i nhau ho\u1eb7c c\u00f3 t\u1ed5ng b\u1eb1ng s\u1ed1 tr\u00f2n ch\u1ee5c, tr\u00f2n tr\u0103m, tr\u00f2n ngh\u00ecn,... \u0111\u1ec3 t\u00ednh nhanh<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}& 2000 + (-570) + 2341 + (-430)\\\\&= [(-570) + (-430)] + (2000 + 2341)\\\\&= (-1000) + 4341\\\\&= 4341 - 1000\\\\= 3341\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'>3341<\/span><\/span> <br\/>"}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:48"},{"id":"1082","post_id":"770","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":14,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":" T\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft: |a| + 5 = |-25| + |-3|","select":["A. a = 23","B. a = -23","C. a = 23; a = -23"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: T\u00ednh |-25| + |-3|<br\/>B\u01b0\u1edbc 2: T\u00ecm |a|<br\/>B\u01b0\u1edbc 3: T\u00ecm a<br\/>(<i><b>L\u01b0u \u00fd:<\/b> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a<\/i>)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}&|a| + 5 = |-25| + |-3|\\\\&|a| + 5 = 25 + 3\\\\&|a| + 5 = 28\\\\&|a| = 28 - 5\\\\&|a| = 23\\end{align*}$<br\/>$\\Rightarrow$ a = 23 ho\u1eb7c a = -23 <br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 23; a = -23<\/span><\/span> <br\/>","column":3}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:48"},{"id":"1083","post_id":"770","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":14,"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c:<br\/>A = x + 2015 + (-x) + (-1005) , bi\u1ebft x = 2017","select":["A = 1010","A = -1010","A = -3020","A = 3020"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: Thay gi\u00e1 tr\u1ecb c\u1ee7a x v\u00e0o bi\u1ec3u th\u1ee9c A<br\/>B\u01b0\u1edbc 2: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c A <br\/>(<i><b>L\u01b0u \u00fd:<\/b> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n, t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng c\u00e1c s\u1ed1 nguy\u00ean \u0111\u1ec3 nh\u00f3m c\u00e1c c\u1eb7p s\u1ed1 \u0111\u1ed1i nhau ho\u1eb7c c\u00f3 t\u1ed5ng b\u1eb1ng s\u1ed1 tr\u00f2n ch\u1ee5c, tr\u00f2n tr\u0103m, tr\u00f2n ngh\u00ecn,... \u0111\u1ec3 t\u00ednh nhanh<\/i>)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = 2017 v\u00e0o bi\u1ec3u th\u1ee9c A = x + 2015 + (-x) + (-1005) ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&= 2017 + 2015 + (-2017) + (-1005)\\\\A&= [2017 + (-2017)] + [2015 + (-1005)]\\\\A&= 0 + (2015 - 1005)\\\\A&= 0 + 1010\\\\A&= 1010\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A = 1010<\/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"}]}