{"common":{"save":0,"post_id":"802","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1571","post_id":"802","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":"Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $\\dfrac{-7}{21} + \\left( 1 + \\dfrac{1}{3} \\right)$ l\u00e0: ","select":["A. 1 ","B. -1 ","C. $\\dfrac{1}{21}$","D. $\\dfrac{-1}{21}$ "],"hint":"Quy \u0111\u1ed3ng r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b>Quy \u0111\u1ed3ng c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean v\u1edbi m\u1eabu s\u1ed1 chung l\u00e0 21 <br\/> <b> B\u01b0\u1edbc 2: <\/b> C\u1ed9ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{-7}{21} + \\left( 1 + \\dfrac{1}{3} \\right) &= \\dfrac{-7}{21} + \\left( \\dfrac{1 . 21}{1 . 21} + \\dfrac{1 . 7}{3 . 7} \\right) \\\\ &= \\dfrac{-7}{21} + \\dfrac{21}{21} + \\dfrac{7}{21} \\\\ &= \\dfrac{-7 + 21 + 7}{21} \\\\ &= \\dfrac{21}{21} \\\\ &= 1 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> ","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:53"},{"id":"1572","post_id":"802","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 c\u1ee7a bi\u1ec3u th\u1ee9c $\\dfrac{5}{12} + \\left( \\dfrac{5}{9} + \\dfrac{-6}{9} \\right)$ l\u00e0: ","select":["A. $\\dfrac{-11}{36}$ ","B. $\\dfrac{11}{36}$ ","C. $\\dfrac{-19}{36}$","D. $\\dfrac{-4}{9}$ "],"hint":"Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh trong ngo\u1eb7c tr\u01b0\u1edbc","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b>Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh trong ngo\u1eb7c tr\u01b0\u1edbc <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 <br\/> <b> B\u01b0\u1edbc 3: <\/b> C\u1ed9ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{5}{12} + \\left( \\dfrac{5}{9} + \\dfrac{-6}{9} \\right) &= \\dfrac{5}{12} + \\dfrac{5 + (-6)}{9} \\\\ &= \\dfrac{5}{12} + \\dfrac{-1}{9} \\\\ &= \\dfrac{5 . 3}{12 . 3} + \\dfrac{-1 . 4}{9 . 4} \\\\ &= \\dfrac{15}{36} + \\dfrac{-4}{36} \\\\ &= \\dfrac{15 + (-4)}{36} \\\\ &= \\dfrac{11}{36} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span> ","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:53"},{"id":"1573","post_id":"802","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":[[4]],"list":[{"point":5,"ques":"Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $ \\left( \\dfrac{-1}{5} + \\dfrac{3}{12} \\right) + \\dfrac{-3}{4}$ l\u00e0: ","select":["A. $\\dfrac{-6}{5}$ ","B. $\\dfrac{6}{5}$ ","C. $\\dfrac{7}{10}$","D. $\\dfrac{-7}{10}$ "],"hint":"R\u00fat g\u1ecdn r\u1ed3i quy \u0111\u1ed3ng v\u00e0 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b>B\u1ecf ngo\u1eb7c, r\u00fat g\u1ecdn ph\u00e2n s\u1ed1 n\u00e0o ch\u01b0a t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 <br\/> <b> B\u01b0\u1edbc 3: <\/b> C\u1ed9ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\left( \\dfrac{-1}{5} + \\dfrac{3}{12} \\right) + \\dfrac{-3}{4} &= \\dfrac{-1}{5} + \\dfrac{3 : 3}{12 : 3} + \\dfrac{-3}{4} \\\\ &= \\dfrac{-1}{5} + \\dfrac{1}{4} + \\dfrac{-3}{4} \\\\ &= \\dfrac{-1 . 4}{5 . 4} + \\dfrac{1 . 5}{4 . 5} + \\dfrac{-3 . 5}{4 . 5} \\\\ &= \\dfrac{-4}{20} + \\dfrac{5}{20} + \\dfrac{-15}{20} \\\\ &= \\dfrac{-4 + 5 + (-15)}{20} \\\\ &= \\dfrac{-14}{20} \\\\ &= \\dfrac{-7}{10} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D <\/span> ","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:53"}]}