{"segment":[{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/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}]}],"id_ques":1471},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/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}]}],"id_ques":1472},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/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}]}],"id_ques":1473},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/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. $\\dfrac{23}{-36}$","B. $\\dfrac{-7}{-21}$","C. $\\dfrac{-11}{121}$","D. $\\dfrac{-8}{12}$ "],"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 $\\dfrac{23}{-36}; \\dfrac{-7}{-21}; \\dfrac{-11}{121}; \\dfrac{-8}{12}$ <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(23, -36) = 1; \u01afCLN(-7, -21) = 7; \u01afCLN(-11, 121) = 11; \u01afCLN(-8, 12) = 4 <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: $\\dfrac{23}{-36}$<\/span> ","column":2}]}],"id_ques":1474},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["1"],["9"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/12.jpg' \/><\/center> <br\/> Cho ph\u00e2n s\u1ed1 c\u00f3 t\u1eed s\u1ed1 l\u00e0 s\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 ba ch\u1eef s\u1ed1 gi\u1ed1ng nhau, m\u1eabu s\u1ed1 l\u00e0 s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 ba ch\u1eef s\u1ed1 gi\u1ed1ng nhau. R\u00fat g\u1ecdn ph\u00e2n s\u1ed1 \u0111\u00f3 \u0111\u1ebfn t\u1ed1i gi\u1ea3n ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1: <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> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft s\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 v\u00e0 s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 <br\/> Vi\u1ebft ph\u00e2n s\u1ed1 \u0111\u00e3 cho <br\/> <b> B\u01b0\u1edbc 2: <\/b> R\u00fat g\u1ecdn ph\u00e2n s\u1ed1 v\u1eeba vi\u1ebft \u1edf b\u01b0\u1edbc 1 <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> S\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 gi\u1ed1ng nhau l\u00e0: 111 <br\/> S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 gi\u1ed1ng nhau l\u00e0: 999 <br\/> $\\Rightarrow$ Ph\u00e2n s\u1ed1 \u0111\u00e3 cho l\u00e0: $\\dfrac{111}{999}$ <br\/> C\u00f3: $\\dfrac{111}{999} = \\dfrac{111 : 111}{999 : 111} = \\dfrac{1}{9}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: 1; 9<\/span> "}]}],"id_ques":1475},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["329"],["341"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/12.jpg' \/><\/center> <br\/> Cho ph\u00e2n s\u1ed1 c\u00f3 t\u1eed s\u1ed1 l\u00e0 s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 ba ch\u1eef s\u1ed1 kh\u00e1c nhau, m\u1eabu s\u1ed1 l\u00e0 s\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 b\u1ed1n ch\u1eef s\u1ed1 kh\u00e1c nhau. R\u00fat g\u1ecdn ph\u00e2n s\u1ed1 \u0111\u00f3 \u0111\u1ebfn t\u1ed1i gi\u1ea3n ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1: <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> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 kh\u00e1c nhau v\u00e0 s\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 4 ch\u1eef s\u1ed1 kh\u00e1c nhau <br\/> Vi\u1ebft ph\u00e2n s\u1ed1 \u0111\u00e3 cho <br\/> <b> B\u01b0\u1edbc 2: <\/b> R\u00fat g\u1ecdn ph\u00e2n s\u1ed1 v\u1eeba vi\u1ebft \u1edf b\u01b0\u1edbc 1 <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 kh\u00e1c nhau l\u00e0: 987 <br\/> S\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 4 ch\u1eef s\u1ed1 kh\u00e1c nhau l\u00e0: 1023 <br\/> $\\Rightarrow$ Ph\u00e2n s\u1ed1 \u0111\u00e3 cho l\u00e0: $\\dfrac{987}{1023}$ <br\/> C\u00f3: $\\dfrac{987}{1023} = \\dfrac{987 : 3}{1023 : 3} = \\dfrac{329}{341}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: 329; 341<\/span> "}]}],"id_ques":1476},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/13.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn ph\u00e2n s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng $\\dfrac{198}{234}$ bi\u1ebft t\u1ed5ng c\u1ee7a t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 \u0111\u00f3 b\u1eb1ng -72. ","select":["A. $\\dfrac{-31}{-41}$","B. $\\dfrac{-33}{-39}$","C. $\\dfrac{-27}{-45}$","D. $\\dfrac{33}{39}$ "],"hint":"","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 ph\u00e2n s\u1ed1 $\\dfrac{198}{234}$ \u0111\u1ebfn t\u1ed1i gi\u1ea3n \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{m}{n}$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> G\u1ecdi ph\u00e2n s\u1ed1 c\u1ea7n t\u00ecm l\u00e0 $\\dfrac{a}{b}$ <br\/> Khi \u0111\u00f3 a = mk; b = nk (v\u1edbi $k \\in \\mathbb{Z}$) <br\/> Theo \u0111\u1ec1 b\u00e0i vi\u1ebft bi\u1ec3u th\u1ee9c th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 c\u1ee7a a, b<br\/> <b> B\u01b0\u1edbc 3: <\/b> T\u00ecm k, sau \u0111\u00f3 t\u00ecm a, b <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\dfrac{198}{234} = \\dfrac{198 : 18}{234 : 18} = \\dfrac{11}{13}$ <br\/> G\u1ecdi ph\u00e2n s\u1ed1 c\u1ea7n t\u00ecm l\u00e0: $\\dfrac{a}{b}$ ($a, b \\in \\mathbb{Z}, b \\neq 0$) <br\/> V\u00ec ph\u00e2n s\u1ed1 $\\dfrac{a}{b}$ c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng ph\u00e2n s\u1ed1 $\\dfrac{198}{234}$ n\u00ean a = 11k, b = 13k $(k \\in \\mathbb{Z})$ <br\/> Theo \u0111\u1ec1 b\u00e0i ta c\u00f3: a + b = -72 <br\/> $\\Rightarrow$ 11k + 13k = -72 <br\/> $\\Rightarrow$ k = -3 <br\/> a = 11 . (-3) = -33; b = 13. (-3) = -39 <br\/> <span class='basic_pink'> V\u1eady ph\u00e2n s\u1ed1 c\u1ea7n t\u00ecm l\u00e0: $\\dfrac{-33}{-39}$<\/span> ","column":2}]}],"id_ques":1477},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/13.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn ph\u00e2n s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng $\\dfrac{5}{6}$ bi\u1ebft t\u1ed5ng c\u1ee7a t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 \u0111\u00f3 b\u1eb1ng 88. ","select":["A. $\\dfrac{40}{48}$","B. $\\dfrac{-40}{48}$","C. $\\dfrac{33}{56}$","D. $\\dfrac{41}{47}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> G\u1ecdi ph\u00e2n s\u1ed1 c\u1ea7n t\u00ecm l\u00e0 $\\dfrac{a}{b}$ <br\/> Khi \u0111\u00f3 a = 5k; b = 6k (v\u1edbi $k \\in \\mathbb{Z}$) <br\/> Theo \u0111\u1ec1 b\u00e0i vi\u1ebft bi\u1ec3u th\u1ee9c th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 c\u1ee7a a, b<br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm k, sau \u0111\u00f3 t\u00ecm a, b <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> G\u1ecdi ph\u00e2n s\u1ed1 c\u1ea7n t\u00ecm l\u00e0: $\\dfrac{a}{b}$ ($a, b \\in \\mathbb{Z}, b \\neq 0$) <br\/> V\u00ec ph\u00e2n s\u1ed1 $\\dfrac{a}{b}$ c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng ph\u00e2n s\u1ed1 $\\dfrac{5}{6}$ n\u00ean a = 5k, b = 6k $(k \\in \\mathbb{Z})$ <br\/> Theo \u0111\u1ec1 b\u00e0i ta c\u00f3: a + b = 88 <br\/> $\\Rightarrow$ 5k + 6k = 88 <br\/> $\\Rightarrow$ k = 8 <br\/> a = 5 . 8 = 40; b = 6 . 8 = 48 <br\/> <span class='basic_pink'> V\u1eady ph\u00e2n s\u1ed1 c\u1ea7n t\u00ecm l\u00e0: $\\dfrac{40}{48}$<\/span> ","column":2}]}],"id_ques":1478},{"time":9,"part":[{"title":"Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"select":["A. $\\dfrac{1}{12}$","B. $\\dfrac{1}{10}$","C. $\\dfrac{3}{10}$"],"ques":"M\u1ed9t v\u00f2i n\u01b0\u1edbc ch\u1ea3y trong 3 gi\u1edd th\u00ec \u0111\u1ea7y b\u1ec3. H\u1ecfi trong 15 ph\u00fat v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c bao nhi\u00eau ph\u1ea7n b\u1ec3. <br\/>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ednh s\u1ed1 n\u01b0\u1edbc v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c trong 1 ph\u00fat <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh s\u1ed1 n\u01b0\u1edbc v\u00f2i \u0111\u00f3 ch\u1ea3y \u0111\u01b0\u1ee3c trong 15 ph\u00fat <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> \u0110\u1ed5i: 3 gi\u1edd = 180 ph\u00fat <br\/> Trong 1 ph\u00fat v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c s\u1ed1 ph\u1ea7n b\u1ec3 l\u00e0: <br\/> 1 : 180 = $\\dfrac{1}{180}$ (b\u1ec3) <br\/> Trong 15 ph\u00fat v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c s\u1ed1 ph\u1ea7n b\u1ec3 l\u00e0: <br\/> $15 . \\dfrac{1}{180} = \\dfrac{1}{12}$ (b\u1ec3)<br\/> <span class='basic_green'><i> Nh\u1eadn x\u00e9t: Th\u00f4ng th\u01b0\u1eddng khi t\u00ednh to\u00e1n ta th\u01b0\u1eddng r\u00fat g\u1ecdn k\u1ebft qu\u1ea3 \u0111\u1ebfn ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n <\/i><\/span> "}]}],"id_ques":1479},{"time":9,"part":[{"title":"Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"select":["A. $\\dfrac{1}{4}$","B. $\\dfrac{3}{4}$","C. $\\dfrac{2}{3}$"],"ques":"C\u00f3 9 qu\u1ea3 cam chia \u0111\u1ec1u cho 12 ng\u01b0\u1eddi. H\u1ecfi m\u1ed7i ng\u01b0\u1eddi \u0111\u01b0\u1ee3c bao nhi\u00eau ph\u1ea7n qu\u1ea3 cam? <br\/> \u0110\u00e1p \u00e1n l\u00e0: ?qu\u1ea3 cam ","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> M\u1ed7i ng\u01b0\u1eddi \u0111\u01b0\u1ee3c s\u1ed1 cam l\u00e0: <br\/> $9 : 12 = \\dfrac{3}{4}$ (qu\u1ea3 cam)"}]}],"id_ques":1480},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["28"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/2.jpg' \/><\/center> <br\/> Khi c\u1ed9ng c\u1ea3 t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 $\\dfrac{23}{40}$ v\u1edbi c\u00f9ng m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean r\u1ed3i r\u00fat g\u1ecdn ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{3}{4}$. H\u00e3y t\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u00f3? <br\/> \u0110\u00e1p \u00e1n l\u00e0: _input_ ","hint":"D\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a ph\u00e2n s\u1ed1 b\u1eb1ng nhau \u0111\u1ec3 t\u00ecm n","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> G\u1ecdi s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u00f3 l\u00e0 n, sau khi c\u1ed9ng th\u00eam ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{23 + n}{40 + n}$ <br\/> V\u00ec $\\dfrac{23 + n}{40 + n} = \\dfrac{3}{4}$ n\u00ean ta t\u00ednh \u0111\u01b0\u1ee3c n d\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a ph\u00e2n s\u1ed1 b\u1eb1ng nhau <br\/> <b> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft ph\u00e2n s\u1ed1 m\u1edbi sau khi c\u1ed9ng c\u1ea3 t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 v\u1edbi n <br\/> <b> B\u01b0\u1edbc 2: <\/b> D\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a ph\u00e2n s\u1ed1 b\u1eb1ng nhau \u0111\u1ec3 t\u00ednh n <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 t\u1ef1 nhi\u00ean c\u1ed9ng th\u00eam \u0111\u00f3 l\u00e0 n <br\/> Khi \u0111\u00f3 ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 m\u1edbi: $\\dfrac{23 + n}{40 + n}$ <br\/> V\u00ec ph\u00e2n s\u1ed1 $\\dfrac{23 + n}{40 + n}$ sau khi r\u00fat g\u1ecdn \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{3}{4}$ n\u00ean ta c\u00f3: <br\/> $\\begin{align*} (23 + n). 4 &= (40 + n) . 3 \\\\ 92 + 4n &= 120 + 3n \\\\ 4n - 3n &= 120 - 92 \\\\ n &= 28 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u00f3 l\u00e0: 28 <\/span> "}]}],"id_ques":1481},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["9"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/2.jpg' \/><\/center> <br\/> Khi b\u1edbt c\u1ea3 t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 $\\dfrac{234}{369}$ \u0111i c\u00f9ng m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean r\u1ed3i r\u00fat g\u1ecdn ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{5}{8}$. H\u00e3y t\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u00f3? <br\/> \u0110\u00e1p \u00e1n l\u00e0: _input_ ","hint":"D\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a ph\u00e2n s\u1ed1 b\u1eb1ng nhau \u0111\u1ec3 t\u00ecm n","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> G\u1ecdi s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u00f3 l\u00e0 n, sau khi b\u1edbt ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{234 - n}{369 - n}$ <br\/> V\u00ec $\\dfrac{239 - n}{369 - n} = \\dfrac{5}{8}$ n\u00ean ta t\u00ednh \u0111\u01b0\u1ee3c n d\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a ph\u00e2n s\u1ed1 b\u1eb1ng nhau <br\/> <b> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft ph\u00e2n s\u1ed1 m\u1edbi sau khi b\u1edbt \u1edf c\u1ea3 t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 \u0111i c\u00f9ng s\u1ed1 t\u1ef1 nhi\u00ean n <br\/> <b> B\u01b0\u1edbc 2: <\/b> D\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a ph\u00e2n s\u1ed1 b\u1eb1ng nhau \u0111\u1ec3 t\u00ednh n <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 t\u1ef1 nhi\u00ean b\u1edbt \u0111i \u0111\u00f3 l\u00e0 n <br\/> Khi \u0111\u00f3 ta \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 m\u1edbi: $\\dfrac{234 - n}{369 - n}$ <br\/> V\u00ec ph\u00e2n s\u1ed1 $\\dfrac{234 - n}{369 - n}$ sau khi r\u00fat g\u1ecdn \u0111\u01b0\u1ee3c ph\u00e2n s\u1ed1 $\\dfrac{5}{8}$ n\u00ean ta c\u00f3: <br\/> $\\begin{align*} (234 - n). 8 &= (369 - n) . 5 \\\\ 1872 - 8n &= 1845 - 5n \\\\ 1872 - 1845 &= -5n + 8n \\\\ 3n &= 27 \\\\ n &= 9 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u00f3 l\u00e0: 9 <\/span> "}]}],"id_ques":1482},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["45"],["5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{270}{450}$ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">75<\/div><\/div>= <div class=\"frac123\"><div class=\"ts\">3<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u1ee7a ph\u00e2n s\u1ed1 ta c\u00f3: <br\/> +) V\u00ec $\\dfrac{270}{450} = \\dfrac{?}{75}$ <br\/> M\u00e0 ta c\u00f3: 450 : 6 = 75 n\u00ean $\\dfrac{270}{450} = \\dfrac{270 : 6}{450 : 6} = \\dfrac{45}{75}$ <br\/> +) V\u00ec $\\dfrac{270}{450} = \\dfrac{3}{?}$ <br\/> M\u00e0 ta c\u00f3: 270 : 90 = 3 n\u00ean $\\dfrac{270}{450} = \\dfrac{270 : 90}{450 : 90} = \\dfrac{3}{5}$ <br\/> <span class='basic_pink'>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: 45; 5 <\/span> "}]}],"id_ques":1483},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["40404"],["5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{121212}{151515}$ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">50505<\/div><\/div> =<div class=\"frac123\"><div class=\"ts\">4<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u1ee7a ph\u00e2n s\u1ed1 ta c\u00f3: <br\/> +) V\u00ec $\\dfrac{121212}{151515} = \\dfrac{?}{50505}$ <br\/> M\u00e0 ta c\u00f3: 121212 : 3 = 40404 n\u00ean $\\dfrac{121212}{151515} = \\dfrac{121212 : 3}{151515 : 3} = \\dfrac{40404}{50505}$ <br\/> +) V\u00ec $\\dfrac{121212}{151515} = \\dfrac{4}{?}$ <br\/> M\u00e0 ta c\u00f3: 121212 : 30303 = 4 n\u00ean $\\dfrac{121212}{151515} = \\dfrac{121212 : 30303}{151515 : 30303} = \\dfrac{4}{5}$ <br\/> <span class='basic_pink'>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: 40404; 5 <\/span> "}]}],"id_ques":1484},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/9.jpg' \/><\/center> <br\/> T\u00ecm x bi\u1ebft: $\\dfrac{x - 2}{35} = \\dfrac{60}{3 . 5 . 7}$ <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. x = 20","B. x = 22","C. x = 18","D. x = -18"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> D\u1ef1a v\u00e0o kh\u00e1i ni\u1ec7m ph\u00e2n s\u1ed1 b\u1eb1ng nhau ta suy ra \u0111\u01b0\u1ee3c \u0111\u1eb3ng th\u1ee9c <br\/> (x - 2) . 3 . 5 . 7 = 35 . 60 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Bi\u1ebfn \u0111\u1ed1i \u0111\u1eb3ng th\u1ee9c tr\u00ean \u0111\u1ec3 t\u00ecm x <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $\\begin{align*} \\dfrac{x - 2}{35} &= \\dfrac{60}{3 . 5 . 7}\\\\ \\dfrac{x - 2}{35} &= \\dfrac{60}{105} \\\\ \\Rightarrow (x - 2) . 105 &= 60 . 35 \\\\ x - 2 &= \\dfrac{60 . 35}{105} \\\\ x - 2 &= 20 \\\\ x &= 20 + 2 \\\\ x &= 22 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. x = 22<\/span> ","column":2}]}],"id_ques":1485},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/9.jpg' \/><\/center> <br\/> T\u00ecm x bi\u1ebft: $\\dfrac{x}{x - 5} = \\dfrac{12}{13}$ <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. x = -55","B. x = 55","C. x = -60","D. x = 60"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> D\u1ef1a v\u00e0o kh\u00e1i ni\u1ec7m ph\u00e2n s\u1ed1 b\u1eb1ng nhau ta suy ra \u0111\u01b0\u1ee3c \u0111\u1eb3ng th\u1ee9c <br\/> x . 13 = (x - 5) . 12 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Bi\u1ebfn \u0111\u1ed1i \u0111\u1eb3ng th\u1ee9c tr\u00ean \u0111\u1ec3 t\u00ecm x <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $\\begin{align*} \\dfrac{x }{x - 5} &= \\dfrac{12}{13}\\\\ \\Rightarrow x . 13 &= (x - 5) . 12 \\\\ 13x &= 12x - 60 \\\\ 13x - 12x &= -60 \\\\ x &= -60 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. x = -60<\/span> ","column":2}]}],"id_ques":1486},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/3.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn ph\u00e2n s\u1ed1 n\u00e0o kh\u00f4ng b\u1eb1ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i. ","select":["A. $\\dfrac{-6}{33}$ ","B. $\\dfrac{2}{11}$ ","C. $\\dfrac{18}{-99}$ ","D. $\\dfrac{-42}{231}$ "],"hint":"D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Ch\u1ecdn ra m\u1ed9t ph\u00e2n s\u1ed1 b\u1ea5t k\u00ec <br\/> <b> B\u01b0\u1edbc 2: <\/b> D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1 x\u00e9t xem ph\u00e2n s\u1ed1 \u0111\u00f3 c\u00f3 b\u1eb1ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i kh\u00f4ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> X\u00e9t ph\u00e2n s\u1ed1: $\\dfrac{-6}{33}$ <br\/> C\u00f3: $\\dfrac{-6}{33} = \\dfrac{-6 : (-3)}{-33 : (-3)} = \\dfrac{2}{-11} \\neq \\dfrac{2}{11}$ <br\/> $\\dfrac{-6}{33} = \\dfrac{-6 . 3}{33 . 3} = \\dfrac{-18}{99} = \\dfrac{18}{-99}$ <br\/> $\\dfrac{-6}{33} = \\dfrac{-6 . 7}{33 . 7} = \\dfrac{-42}{231}$ <br\/> $\\Rightarrow$ $\\dfrac{-6}{33} = \\dfrac{18}{-99} = \\dfrac{-42}{231}$ <br\/> V\u1eady ph\u00e2n s\u1ed1 kh\u00f4ng b\u1eb1ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i l\u00e0 ph\u00e2n s\u1ed1 $\\dfrac{2}{11}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $\\dfrac{2}{11}$ <\/span> ","column":2}]}],"id_ques":1487},{"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='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai30/lv2/img\/3.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn ph\u00e2n s\u1ed1 n\u00e0o kh\u00f4ng b\u1eb1ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i. ","select":["A. $\\dfrac{-2}{7}$ ","B. $\\dfrac{10}{35}$ ","C. $\\dfrac{8}{-28}$ ","D. $\\dfrac{-12}{42}$ "],"hint":"D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Ch\u1ecdn ra m\u1ed9t ph\u00e2n s\u1ed1 b\u1ea5t k\u00ec <br\/> <b> B\u01b0\u1edbc 2: <\/b> D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1 x\u00e9t xem ph\u00e2n s\u1ed1 \u0111\u00f3 c\u00f3 b\u1eb1ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i kh\u00f4ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> X\u00e9t ph\u00e2n s\u1ed1: $\\dfrac{-2}{7}$ <br\/> C\u00f3: $\\dfrac{-2}{7} = \\dfrac{-2 . 5}{7 . 5} = \\dfrac{-10}{35} \\neq \\dfrac{10}{35}$ <br\/> $\\dfrac{-2}{7} = \\dfrac{-2 . 4}{7 . 4} = \\dfrac{-8}{28} = \\dfrac{8}{-28}$ <br\/> $\\dfrac{-2}{7} = \\dfrac{-2 . 6}{7 . 6} = \\dfrac{-12}{42}$ <br\/> $\\Rightarrow$ $\\dfrac{-2}{7} = \\dfrac{8}{-28} = \\dfrac{-12}{42}$ <br\/> V\u1eady ph\u00e2n s\u1ed1 kh\u00f4ng b\u1eb1ng c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i l\u00e0 ph\u00e2n s\u1ed1 $\\dfrac{10}{35}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $\\dfrac{10}{35}$ <\/span> ","column":2}]}],"id_ques":1488},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-3"],["17"]]],"list":[{"point":5,"width":30,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> <div class=\"frac123\"><div class=\"ts\">13._input_<\/div><div class=\"ms\">_input_ .(-3)<\/div><\/div> = $\\dfrac{-39}{-51}$ ","hint":"D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo \u0111\u1ec1 b\u00e0i: $\\dfrac{13 . a}{? . (-3)} = \\dfrac{-39}{-51}$ ($a \\in \\mathbb{Z}, a \\neq 0$) <br\/> $\\Rightarrow$ 13 . a = -39 hay a = -3 <br\/>V\u00e0 $?. (-3) = -51$ $\\Rightarrow$ ? = -51 : (-3) = 17 <br\/> N\u00ean: $\\dfrac{13 . (-3)}{17 . (-3)} = \\dfrac{-39}{-51}$ <br\/> <span class='basic_pink'>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: -3; 17 <\/span> <br\/> <span class='basic_green'><i> T\u00ednh ch\u1ea5t: Khi chia c\u1ea3 t\u1eed s\u1ed1 v\u00e0 m\u1eabu s\u1ed1 c\u1ee7a m\u1ed9t ph\u00e2n s\u1ed1 cho 1 s\u1ed1 nguy\u00ean kh\u00e1c 0, ta \u0111\u01b0\u1ee3c m\u1ed9t ph\u00e2n s\u1ed1 m\u1edbi b\u1eb1ng ph\u00e2n s\u1ed1 \u0111\u00e3 cho <\/i><\/span> "}]}],"id_ques":1489},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["27"],["(-9)"]]],"list":[{"point":5,"width":30,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> <div class=\"frac123\"><div class=\"ts\">_input_:(-9)<\/div><div class=\"ms\">72:_input_<\/div><\/div> = $\\dfrac{-3}{-8}$ ","hint":"D\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a ph\u00e2n s\u1ed1","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo \u0111\u1ec1 b\u00e0i: $\\dfrac{? : (-9)}{72 : a} = \\dfrac{-3}{-8}$ ($a \\in \\mathbb{Z}, a \\neq 0$) (1) <br\/> T\u1eeb (1) $\\Rightarrow$ 72 : a = -8 n\u00ean a = 72 : (-8) = -9 <br\/>V\u00e0 $? : (-9) = -3 <br\/> N\u00ean <br\/> ? = (-3) . (-9) = 27$ <br\/> Ta c\u00f3: $\\dfrac{27 : (-9)}{72 : (-9)} = \\dfrac{-3}{-8}$ <br\/> <span class='basic_pink'>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: 27; (-9) <\/span> "}]}],"id_ques":1490}],"lesson":{"save":0,"level":2}}