{"common":{"save":0,"post_id":"944","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"561","post_id":"944","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng ","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng ","title_trans":"","temp":"fill_the_blank","correct":[[["768"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" <span class='basic_left'> Nh\u00e2n vi\u00ean vi t\u00ednh A c\u00f3 th\u1ec3 \u0111\u00e1nh \u0111\u01b0\u1ee3c 160 t\u1eeb trong 2,5 ph\u00fat. Trong 12 ph\u00fat nh\u00e2n vi\u00ean \u0111\u00f3 \u0111\u00e1nh \u0111\u01b0\u1ee3c bao nhi\u00eau t\u1eeb? <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> _input_ (t\u1eeb) <\/span> <br\/> ","hint":"L\u1eadp c\u00e1c t\u1ec9 s\u1ed1 t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng. ","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh quan h\u1ec7 t\u1ec9 l\u1ec7 thu\u1eadn gi\u1eefa hai \u0111\u1ea1i l\u01b0\u1ee3ng $y$ v\u00e0 $x$ <br\/> B\u01b0\u1edbc 2: \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t t\u1ec9 s\u1ed1 hai gi\u00e1 tr\u1ecb b\u1ea5t k\u00ec c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y b\u1eb1ng t\u1ec9 s\u1ed1 hai gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng kia. <\/span><br\/><br\/> <span class='basic_left'> T\u00f3m t\u1eaft \u0111\u1ec1 b\u00e0i: <br\/> S\u1ed1 t\u1eeb $ \\qquad$ Th\u1eddi gian <br\/> 160 t\u1eeb $\\hspace{1cm}$ 2,5 ph\u00fat <br\/> $x$ t\u1eeb ? $\\hspace{1cm}$ 12 ph\u00fat <\/span> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3 th\u1eddi gian v\u00e0 s\u1ed1 t\u1eeb \u0111\u00e1nh \u0111\u01b0\u1ee3c l\u00e0 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn. <br\/> Theo t\u00ednh ch\u1ea5t c\u1ee7a hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn, ta c\u00f3: $ \\dfrac{160}{x} = \\dfrac{2,5}{12} $ <br\/> Suy ra: $ x = \\dfrac{160.12}{2,5} = 768 $ <br\/> V\u1eady s\u1ed1 t\u1eeb \u0111\u00e1nh \u0111\u01b0\u1ee3c trong 12 ph\u00fat l\u00e0: 768 (t\u1eeb) <br\/><span class='basic_pink'> \u0110\u00e1p s\u1ed1 l\u00e0 768. <\/span> "}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:49"},{"id":"562","post_id":"944","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":"<span class='basic_left'> Cho $x$ v\u00e0 $y$ l\u00e0 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn v\u00e0 khi $x$ = 12 th\u00ec $y$ = 4. H\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 $k$ c\u1ee7a $y$ \u0111\u1ed1i v\u1edbi $x$ l\u00e0? <\/span>","select":["A. 3 ","B. 8 ","C. 16 ","D. $\\dfrac{1}{3}$ "],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> X\u00e1c \u0111\u1ecbnh h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 $k$ gi\u1eefa $y$ v\u00e0 $x$; $k = \\dfrac{y}{x}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> V\u00ec $x$ v\u00e0 $y$ l\u00e0 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn n\u00ean $y = kx$; ($k$ l\u00e0 h\u1eb1ng s\u1ed1, $k \\neq 0$) <br\/> v\u00e0 theo \u0111i\u1ec1u ki\u1ec7n $x$ = 12 th\u00ec $y$ = 4 n\u00ean thay v\u00e0o ta t\u00ednh \u0111\u01b0\u1ee3c: <br\/> $k = \\dfrac{4}{12} = \\dfrac{1}{3} $ <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:49"},{"id":"563","post_id":"944","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":" \u0110\u1ea1i l\u01b0\u1ee3ng x t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng y. N\u1ebfu y t\u0103ng l\u00ean 5 l\u1ea7n th\u00ec: ","select":["A. x gi\u1ea3m \u0111i 5 l\u1ea7n ","B. x t\u0103ng l\u00ean 5 l\u1ea7n ","C. x t\u0103ng l\u00ean 10 l\u1ea7n","D. x kh\u00f4ng t\u0103ng c\u0169ng kh\u00f4ng gi\u1ea3m "],"explain":" V\u00ec x, y l\u00e0 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn n\u00ean $y = kx \\Leftrightarrow x = \\frac{y}{k}$ <br\/> Suy ra n\u1ebfu $y$ t\u0103ng l\u00ean $5$ l\u1ea7n th\u00ec $x$ c\u0169ng t\u0103ng l\u00ean $5$ l\u1ea7n. <br\/><br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:49"}]}