{"common":{"save":0,"post_id":"811","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1721","post_id":"811","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["10"],["2"],["17"]]],"list":[{"point":5,"width":50,"type_input":"","input_hint":["frac"],"ques":"T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd: <br\/> $17\\dfrac{2}{31} - \\left( \\dfrac{15}{17} + 6\\dfrac{2}{31} \\right)$ = _input_<div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u1ecf ngo\u1eb7c v\u00e0 nh\u00f3m hai h\u1ed7n s\u1ed1 c\u00f3 ph\u1ea7n ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh. <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $ \\begin{align*} 17\\dfrac{2}{31} - \\left( \\dfrac{15}{17} + 6\\dfrac{2}{31} \\right) &= 17 \\dfrac{2}{31} - \\dfrac{15}{17} - 6\\dfrac{2}{31} \\\\ &= \\left( 17 \\dfrac{2}{31} - 6 \\dfrac{2}{31} \\right) - \\dfrac{15}{17} \\\\ &= 11 - \\dfrac{15}{17} \\\\ &= 10\\dfrac{17}{17} - \\dfrac{15}{17} \\\\ &= 10 \\dfrac{2}{17} \\end{align*} $<br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: M\u1ed9t s\u1ed1 nguy\u00ean c\u0169ng c\u00f3 th\u1ec3 vi\u1ebft d\u01b0\u1edbi d\u1ea1ng h\u1ed7n s\u1ed1. V\u00ed d\u1ee5 \u1edf tr\u00ean ta \u0111\u00e3 vi\u1ebft $11 = 10\\dfrac{17}{17}$ \u0111\u1ec3 th\u1ef1c hi\u1ec7n tr\u1eeb h\u1ed7n s\u1ed1 <br\/> \u0110\u1eb7c bi\u1ec7t l\u01b0u \u00fd: Khi th\u1ef1c hi\u1ec7n tr\u1eeb h\u1ed7n s\u1ed1 ch\u1eb3ng h\u1ea1n $17 \\dfrac{2}{31} - 6 \\dfrac{2}{31}$ h\u1ecdc sinh hay m\u1eafc sai l\u1ea7m l\u00e0 l\u1ea5y 17 - 6 = 11; $\\dfrac{2}{31} - \\dfrac{2}{31} = 0$ n\u00ean $17 \\dfrac{2}{31} - 6 \\dfrac{2}{31} = 11 . 0 = 0$ <\/i> <\/span> "}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:54"},{"id":"1722","post_id":"811","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["15"],["39"],["248"]]],"list":[{"point":5,"width":50,"type_input":"","input_hint":["frac"],"ques":"T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd: <br\/> $\\left( 17 \\dfrac{29}{31} - 3 \\dfrac{7}{8} \\right) - \\left( 2 \\dfrac{28}{31} - 4 \\right) $ = _input_<div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u1ecf ngo\u1eb7c v\u00e0 nh\u00f3m hai h\u1ed7n s\u1ed1 c\u00f3 ph\u1ea7n ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh. <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $ \\begin{align*} \\left( 17 \\dfrac{29}{31} - 3 \\dfrac{7}{8} \\right) - \\left( 2 \\dfrac{28}{31} - 4 \\right) &= 17 \\dfrac{29}{31} - 3 \\dfrac{7}{8} - 2 \\dfrac{28}{31} + 4 \\\\ &= \\left( 17 \\dfrac{29}{31} - 2 \\dfrac{28}{31} \\right) + \\left( 4 - 3 \\dfrac{7}{8} \\right) \\\\ &= 15 \\dfrac{1}{31} + \\left( 3 \\dfrac{8}{8} - 3 \\dfrac{7}{8} \\right) \\\\ &= \\dfrac{466}{31} + \\dfrac{1}{8} \\\\ &= 15\\dfrac{39}{248} \\end{align*} $"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:54"},{"id":"1723","post_id":"811","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["12"]]],"list":[{"point":5,"width":50,"type_input":"","input_hint":["frac"],"ques":"T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd: <br\/> $\\left( 3 \\dfrac{2}{9} . \\dfrac{15}{23} . 1 \\dfrac{7}{29} \\right) : \\dfrac{5}{23} $ = _input_ ","hint":"Nh\u00f3m c\u00e1c ph\u00e2n s\u1ed1 ho\u1eb7c h\u1ed7n s\u1ed1 \u0111\u1ec3 khi nh\u00e2n hay chia \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0 s\u1ed1 nguy\u00ean","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u1ecf ngo\u1eb7c v\u00e0 nh\u00f3m hai h\u1ed7n s\u1ed1 c\u00f3 ph\u1ea7n ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh. <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $ \\begin{align*} \\left( 3 \\dfrac{2}{9} . \\dfrac{15}{23} . 1 \\dfrac{7}{29} \\right) : \\dfrac{5}{23} &= 3\\dfrac{2}{9} . \\dfrac{15}{23} . 1 \\dfrac{7}{29} : \\dfrac{5}{23} \\\\ &= \\left( \\dfrac{29}{9} . \\dfrac{36}{29} \\right) . \\left( \\dfrac{15}{23} : \\dfrac{5}{23} \\right) \\\\ &= 4 . 3 = 12 \\end{align*} $"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:54"}]}