{"common":{"save":0,"post_id":"804","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1601","post_id":"804","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":"K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh: $\\dfrac{1}{2} - \\dfrac{1}{5}$ l\u00e0: ","select":["A. $\\dfrac{1}{3}$ ","B. $\\dfrac{0}{3}$","C. $\\dfrac{3}{10}$","D. $\\dfrac{3}{3}$ "],"hint":"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> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 hai ph\u00e2n s\u1ed1 $\\dfrac{1}{2}$ v\u00e0 $\\dfrac{1}{5}$ <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n tr\u1eeb hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta tr\u1eeb t\u1eed s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 th\u1ee9 nh\u1ea5t cho t\u1eed s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 th\u1ee9 2, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{1}{2} - \\dfrac{1}{5} &= \\dfrac{1 . 5}{2 . 5} - \\dfrac{1 . 2}{5 . 2} \\\\ &= \\dfrac{5}{10} - \\dfrac{2}{10} \\\\ &= \\dfrac{5 - 2}{10} \\\\ &= \\dfrac{3}{10} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C <\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:53"},{"id":"1602","post_id":"804","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":"K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh: $\\dfrac{3}{8} - \\dfrac{1}{2}$ l\u00e0: ","select":["A. $\\dfrac{2}{6}$ ","B. $\\dfrac{-1}{8}$","C. $\\dfrac{2}{8}$","D. $\\dfrac{1}{8}$ "],"hint":"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> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 ph\u00e2n s\u1ed1 $\\dfrac{1}{2}$ v\u1edbi m\u1eabu s\u1ed1 l\u00e0 8 <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n tr\u1eeb hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta tr\u1eeb t\u1eed s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 th\u1ee9 nh\u1ea5t cho t\u1eed s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 th\u1ee9 2, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{3}{8} - \\dfrac{1}{2} &= \\dfrac{3}{8} - \\dfrac{1 . 4}{2 . 4} \\\\ &= \\dfrac{3}{8} - \\dfrac{4}{8} \\\\ &= \\dfrac{3 - 4}{8} \\\\ &= \\dfrac{-1}{8} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:53"},{"id":"1603","post_id":"804","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":"K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh: $\\dfrac{-5}{7} + \\dfrac{3}{5}$ l\u00e0: ","select":["A. $\\dfrac{-4}{35}$ ","B. $\\dfrac{4}{35}$","C. $\\dfrac{46}{35}$","D. $\\dfrac{-46}{35}$ "],"hint":"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> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-5}{7}$ v\u00e0 $\\dfrac{3}{5}$ v\u1edbi m\u1eabu s\u1ed1 chung l\u00e0 35 <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{-5}{7} + \\dfrac{3}{5} &= \\dfrac{-5 . 5}{7 . 5} + \\dfrac{3 . 7}{5 . 7} \\\\ &= \\dfrac{-25}{35} + \\dfrac{21}{35} \\\\ &= \\dfrac{-25 + 21}{35} \\\\ &= \\dfrac{-4}{35} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> ","column":4}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:53"}]}