{"common":{"save":0,"post_id":"1026","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"541","post_id":"1026","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":[[["23"],["6"]]],"list":[{"width":50,"type_input":"","point":10,"ques":" T\u00ecm $x$ trong t\u1ec9 l\u1ec7 th\u1ee9c: $ \\dfrac{x-3}{5-x} = \\dfrac{5}{7} $ <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $ x = \\dfrac{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}}{\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}} $","hint":" \u00c1p d\u1ee5ng: $ \\dfrac{a}{b} = \\dfrac{c}{d} \\Leftrightarrow ad = bc $ ","explain":" \u0110i\u1ec1u ki\u1ec7n: $x\\neq 5$ <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ee7a t\u1ec9 l\u1ec7 th\u1ee9c ta c\u00f3: <br\/> $ \\dfrac{x-3}{5-x} = \\dfrac{5}{7} \\\\ \\Rightarrow 7.(x - 3) = 5.(5 - x) \\\\ \\Rightarrow 7x - 21 = 25 - 5x \\\\ \\Rightarrow 7x + 5x = 21 + 25 \\\\ \\Rightarrow 12x = 46 \\\\ \\Rightarrow x = \\dfrac{46}{12} = \\dfrac{23}{6} $ <br\/> <br\/> <span class='basic_pink'> V\u1eady gi\u00e1 tr\u1ecb c\u1ee7a x l\u00e0 $ \\dfrac{23}{6} $ <\/span><\/span>"}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:48"},{"id":"542","post_id":"1026","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":10,"ques":" <center><img src='img\/2.jpg'\/><\/center> T\u00ecm $x \\in \\mathbb{Q}$ bi\u1ebft: <br\/> $ \\dfrac{11}{12} - \\left( \\dfrac{2}{5} + x \\right) = \\dfrac{2}{3} $ ","select":["A. $ x = \\dfrac{3}{20}$","B. $x = \\dfrac{-3}{20}$","C. $x = \\dfrac{71}{60}$","D. $ x = \\dfrac{-71}{60} $"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u00e0i to\u00e1n t\u00ecm x <\/b> <br\/> B\u01b0\u1edbc 1. B\u1ecf d\u1ea5u ngo\u1eb7c. <br\/> B\u01b0\u1edbc 2. Chuy\u1ec3n c\u00e1c h\u1ea1ng t\u1eed ch\u1ee9a $x$ sang m\u1ed9t v\u1ebf, c\u00e1c h\u1eb1ng s\u1ed1 sang v\u1ebf kia. <br\/> B\u01b0\u1edbc 3. Thu g\u1ecdn v\u00e0 t\u00ecm $x$. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> Ta c\u00f3: $ \\dfrac{11}{12} - \\left( \\dfrac{2}{5} + x \\right) = \\dfrac{2}{3} \\\\ \\Rightarrow \\dfrac{11}{12} - \\dfrac{2}{5} - x = \\dfrac{2}{3} \\\\ \\Rightarrow \\dfrac{11}{12} - \\dfrac{2}{5} - \\dfrac{2}{3} = x \\\\ \\Rightarrow x = \\dfrac{55}{60} - \\dfrac{24}{60} - \\dfrac{40}{60} \\\\ \\Rightarrow x = \\dfrac{-9}{60} = \\dfrac{-3}{20}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/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 09:22:48"},{"id":"543","post_id":"1026","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":[[["3"]]],"list":[{"width":50,"content":"","type_input":"","point":10,"ques":" Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh: \\begin{align*} M = \\dfrac{14}{13} + \\dfrac{5}{6} + \\dfrac{3}{5} - \\dfrac{1}{13} + \\dfrac{1}{6} + \\dfrac{2}{5} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{} \\end{align*}","hint":"Nh\u00f3m s\u1ed1 h\u1ea1ng th\u00edch h\u1ee3p r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh.","explain":"Ta c\u00f3: $ M = \\dfrac{14}{13} + \\dfrac{5}{6} + \\dfrac{3}{5} - \\dfrac{1}{13} + \\dfrac{1}{6} + \\dfrac{2}{5} \\\\ = \\left( \\dfrac{14}{13} - \\dfrac{1}{13} \\right) + \\left( \\dfrac{5}{6} + \\dfrac{1}{6} \\right) + \\left( \\dfrac{3}{5} + \\dfrac{2}{5} \\right) \\\\ = 1 + 1 +1 = 3 $<br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $3$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"3","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:48"}]}