{"common":{"save":0,"post_id":"796","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1471","post_id":"796","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":"<center><img src='img\/4.jpg' \/><\/center> <br\/> R\u00fat g\u1ecdn ph\u00e2n s\u1ed1 $\\dfrac{10 . 15 . 17}{20 . 34}$ ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{4}{15}$","B. $\\dfrac{15}{4}$","C. $\\dfrac{30}{4}$","D. $\\dfrac{5}{4}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft 20 = 10 . 2; 34 = 17 . 2 <br\/> <b> B\u01b0\u1edbc 2: <\/b> R\u00fat g\u1ecdn nh\u1eefng th\u1eeba s\u1ed1 gi\u1ed1ng nhau \u1edf t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 <br\/> <b> B\u01b0\u1edbc 3: <\/b> Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\dfrac{10 . 15 . 17}{20 . 34} = \\dfrac{10 . 15 . 17}{10 . 2 . 17 . 2} = \\dfrac{15}{2 . 2} = \\dfrac{15}{4}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $\\dfrac{15}{4}$<\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:52"},{"id":"1472","post_id":"796","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":"<center><img src='img\/4.jpg' \/><\/center> <br\/> R\u00fat g\u1ecdn ph\u00e2n s\u1ed1 $\\dfrac{-8 . 27 . 25}{-30 . (-21) . (-15)}$ ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{5}{7}$","B. $\\dfrac{15}{21}$","C. $\\dfrac{4}{7}$","D. $\\dfrac{5}{3}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft -8 = 2 . (-4); 27 = 3 . 9; 25 = 5 . 5; -15 = -3 . 5; -21 = 3 . (-7); -30 = 2 . (-15) <br\/> <b> B\u01b0\u1edbc 2: <\/b> R\u00fat g\u1ecdn nh\u1eefng th\u1eeba s\u1ed1 gi\u1ed1ng nhau \u1edf t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 <br\/> <b> B\u01b0\u1edbc 3: <\/b> Bi\u1ebfn \u0111\u1ed5i v\u00e0 r\u00fat g\u1ecdn n\u1ebfu c\u00f3 th\u1ec3, sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\dfrac{-8 . 27 . 25}{-30 . (-21) . (-15)} = \\dfrac{2 . (-4) . 3 . 9 . 5 . 5}{2 . (-15) . 3 . (-7) . (-3) . 5} = \\dfrac{(-4) . 9 . 5}{(-15) . (-7) . (-3)} = \\dfrac{(-4) . 3 . 3 . 5}{(-15) . (-7) . (-3)} = \\dfrac{15 . (-4)}{15 . (-7)} = \\dfrac{4}{7}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. $\\dfrac{4}{7}$<\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:52"},{"id":"1473","post_id":"796","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":"<center><img src='img\/11.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n trong c\u00e1c ph\u00e2n s\u1ed1 sau:","select":["A. $\\dfrac{-14}{35}$","B. $\\dfrac{9}{34}$","C. $\\dfrac{-10}{48}$","D. $\\dfrac{-12}{56}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm \u01afCLN c\u1ee7a t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 c\u1ee7a m\u1ed7i ph\u00e2n s\u1ed1 $\\dfrac{-14}{35}; \\dfrac{9}{34}; \\dfrac{-10}{48}; \\dfrac{-12}{56}$ <br\/> <b> B\u01b0\u1edbc 2: <\/b>Ch\u1ecdn ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n <br\/> Ph\u00e2n s\u1ed1 n\u00e0o c\u00f3 \u01afCLN c\u1ee7a t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 b\u1eb1ng 1 th\u00ec \u0111\u00f3 l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> \u01afCLN(-14, 35) = 7; \u01afCLN(9; 34) = 1; \u01afCLN(-10, 48) = 2; \u01afCLN(-12, 56) = 2 <br\/> V\u00ec ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n l\u00e0 ph\u00e2n s\u1ed1 m\u00e0 t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 kh\u00f4ng c\u00f3 \u01b0\u1edbc chung n\u00e0o kh\u00e1c ngo\u00e0i 1 v\u00e0 -1 <br\/> <span class='basic_pink'>N\u00ean ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n l\u00e0: $\\dfrac{9}{34}$<\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: Mu\u1ed1n bi\u1ebft hai ph\u00e2n s\u1ed1 $\\dfrac{a}{b}$ \u0111\u00e3 t\u1ed1i gi\u1ea3n ch\u01b0a ta ch\u1ec9 c\u1ea7n t\u00ecm \u01afCLN(a, b) <br\/> N\u1ebfu \u01afCLN(a, b) = 1 th\u00ec ph\u00e2n s\u1ed1 $\\dfrac{a}{b}$ l\u00e0 t\u1ed1i gi\u1ea3n <br\/> N\u1ebfu \u01afCLN(a, b) > 1 th\u00ec ph\u00e2n s\u1ed1 $\\dfrac{a}{b}$ ch\u01b0a t\u1ed1i gi\u1ea3n <\/i><\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:52"}]}