{"common":{"save":0,"post_id":"801","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1551","post_id":"801","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":"T\u00ednh. <br\/> $\\dfrac{65}{91} + \\dfrac{-33}{55}$ = ","select":["A. $\\dfrac{-46}{35}$ ","B. $\\dfrac{46}{35}$","C. $\\dfrac{4}{35}$","D. $\\dfrac{-4}{35}$ "],"hint":"R\u00fat g\u1ecdn sau \u0111\u00f3 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> R\u00fat g\u1ecdn c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{65}{91}; \\dfrac{-33}{55}$ \u0111\u1ebfn t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 sau khi r\u00fat g\u1ecdn <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta c\u1ed9ng t\u1eed s\u1ed1 v\u1edbi t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{65}{91} + \\dfrac{-33}{91} &= \\dfrac{65 : 13}{91 : 13} + \\dfrac{-33 : 11}{55 : 11} \\\\ &= \\dfrac{5}{7} + \\dfrac{-3}{5} \\\\ &= \\dfrac{5 . 5}{7 . 5} + \\dfrac{-3 . 7}{5 . 7} \\\\ &= \\dfrac{25}{35} + \\dfrac{-21}{35} \\\\ &= \\dfrac{25 + (-21)}{35} \\\\ &= \\dfrac{4}{35} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: 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":"1552","post_id":"801","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":"T\u00ednh. <br\/> $\\dfrac{-650}{1430} + \\dfrac{588}{686}$ = ","select":["A. $\\dfrac{-31}{77}$ ","B. $\\dfrac{31}{77}$","C. $\\dfrac{101}{77}$","D. $\\dfrac{-101}{77}$ "],"hint":"R\u00fat g\u1ecdn sau \u0111\u00f3 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> R\u00fat g\u1ecdn c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-650}{1430}; \\dfrac{588}{686}$ \u0111\u1ebfn t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 sau khi r\u00fat g\u1ecdn <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta c\u1ed9ng t\u1eed s\u1ed1 v\u1edbi t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{-650}{1430} + \\dfrac{588}{686} &= \\dfrac{-650 : 130}{1430 : 130} + \\dfrac{588 : 98}{686 : 98} \\\\ &= \\dfrac{-5}{11} + \\dfrac{6}{7} \\\\ &= \\dfrac{-5 . 7}{11 . 5} + \\dfrac{6 . 11}{7 . 11} \\\\ &= \\dfrac{-35}{77} + \\dfrac{66}{77} \\\\ &= \\dfrac{-35 + 66}{77} \\\\ &= \\dfrac{31}{77} \\end{align*}$ <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":"1553","post_id":"801","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":"T\u00ednh. <br\/> $\\dfrac{36}{-84} + \\dfrac{100}{450}$ = ","select":["A. $\\dfrac{-13}{63}$ ","B. $\\dfrac{13}{63}$","C. $\\dfrac{41}{63}$","D. $\\dfrac{-41}{63}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u0110\u01b0a ph\u00e2n s\u1ed1 $\\dfrac{36}{-84}$ v\u1ec1 ph\u00e2n s\u1ed1 c\u00f3 m\u1eabu d\u01b0\u01a1ng <br\/> R\u00fat g\u1ecdn c\u00e1c ph\u00e2n s\u1ed1 \u0111\u1ebfn 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> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta c\u1ed9ng t\u1eed s\u1ed1 v\u1edbi t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{36}{-84} + \\dfrac{100}{450} &= \\dfrac{36 : (-12)}{-84 : (-12)} + \\dfrac{100 : 50}{450 : 50} \\\\ &= \\dfrac{-3}{7} + \\dfrac{2}{9} \\\\ &= \\dfrac{-3 . 9}{7 . 9} + \\dfrac{2 . 7}{9 . 7} \\\\ &= \\dfrac{-27}{63} + \\dfrac{14}{63} \\\\ &= \\dfrac{-27 + 14}{63} \\\\ &= \\dfrac{-13}{63} \\end{align*}$ <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"}]}