{"segment":[{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["1"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/2.jpg' \/><\/center> T\u00ednh gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c $A = 0,(37) + 0,(62) = $_input_ ","hint":"\u0110\u01b0a s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n v\u1ec1 ph\u00e2n s\u1ed1 r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> \u0110\u1ed5i s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n th\u00e0nh ph\u00e2n s\u1ed1 <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i <\/i> <\/u> <br\/> S\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n c\u00f3 <i> chu k\u00ec <\/i> ngay sau d\u1ea5u ph\u1ea9y. <br\/> <u> C\u00e1ch chuy\u1ec3n<\/u>: L\u1ea5y ph\u1ea7n nguy\u00ean c\u1ee7a n\u00f3 + ph\u00e2n s\u1ed1 [ c\u00f3 <b> t\u1eed s\u1ed1 <\/b> l\u00e0 s\u1ed1 chu k\u00ec; <b> m\u1eabu s\u1ed1 <\/b> l\u00e0 s\u1ed1 g\u1ed3m c\u00e1c ch\u1eef s\u1ed1 9 (s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 9 b\u1eb1ng s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a chu k\u00ec)]. <br\/> * M\u1ed9t c\u00e1ch t\u1ed5ng qu\u00e1t: $ \\overline{0,(a_{1}a_{2}...a_{n})} = \\dfrac{\\overline{a_{1}a_{2}...a_{n}}}{\\underbrace{999...9}_{n}} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $A = 0,(37) + 0,(62) \\\\ = \\dfrac{37}{99} + \\dfrac{62}{99} \\\\ = \\dfrac{99}{99} = 1 $ <br\/> <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 l\u00e0 1. <\/span><\/span>"}]}],"id_ques":371},{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/4.jpg' \/><\/center>T\u00ecm $x $ bi\u1ebft: <br\/> $x : (-2,14) = -3,12 : 1,2 $ ","select":["A. x = 5,546 ","B. x = 0,82 ","C. x = 5,456 ","D. x = 5,564 "],"explain":" Ta c\u00f3: $x : (-2,14) = -3,12 : 1,2 \\\\ \\Rightarrow x = \\dfrac{-2,14.(-3,12)}{1,2} \\\\ = 5,564 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><\/span> ","column":2}]}],"id_ques":372},{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/4.jpg' \/><\/center> S\u1ed1 c\u00e1c ch\u1eef s\u1ed1 trong chu k\u00ec bi\u1ec3u di\u1ec5n s\u1ed1 $\\dfrac{12}{39}$ l\u00e0: ","select":["A. 3 ","B. 4","C. 5","D. 6"],"hint":" $\\dfrac{12}{39} = 0,307692307692... $ ","explain":" Ta c\u00f3: $\\dfrac{12}{39} = 0,307692307692... = 0,(307692)$ <br\/> Chu k\u00ec l\u00e0 : 307692 <br\/> Suy ra s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 trong chu k\u00ec bi\u1ec3u di\u1ec5n s\u1ed1 $\\dfrac{12}{39}$ l\u00e0 6. <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><\/span> ","column":4}]}],"id_ques":373},{"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/lop7/toan/daiso/bai8/lv2/img\/4.jpg' \/><\/center> T\u1ed5ng c\u1ee7a t\u1eed v\u00e0 m\u1eabu c\u1ee7a ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n bi\u1ec3u di\u1ec5n s\u1ed1 th\u1eadp ph\u00e2n 0,(12) l\u00e0: ","select":["A. 4 ","B. 33","C. 37","D. 29"],"explain":" Ta c\u00f3: $0,(12) = \\dfrac{12}{99} = \\dfrac{4}{33}$ <br\/> Suy ra t\u1ed5ng c\u1ee7a t\u1eed v\u00e0 m\u1eabu c\u1ee7a ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n bi\u1ec3u di\u1ec5n s\u1ed1 th\u1eadp ph\u00e2n 0,(12) l\u00e0 : 4 + 33 = 37 <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}],"id_ques":374},{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a $A = 0,(36) - 0,(71)$ ","select":["A. $0.35$ ","B. $0,(35)$ ","C. $ -0,35$ ","D. $-0,(35)$ "],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> \u0110\u1ed5i s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n th\u00e0nh ph\u00e2n s\u1ed1 <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i <\/i> <\/u> <br\/> S\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n c\u00f3 <i> chu k\u00ec <\/i> ngay sau d\u1ea5u ph\u1ea9y. <br\/> <u> C\u00e1ch chuy\u1ec3n<\/u>: L\u1ea5y ph\u1ea7n nguy\u00ean c\u1ee7a n\u00f3 + ph\u00e2n s\u1ed1 [ c\u00f3 <b> t\u1eed s\u1ed1 <\/b> l\u00e0 s\u1ed1 chu k\u00ec; <b> m\u1eabu s\u1ed1 <\/b> l\u00e0 s\u1ed1 g\u1ed3m c\u00e1c ch\u1eef s\u1ed1 9 (s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 9 b\u1eb1ng s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a chu k\u00ec)]. <br\/> * M\u1ed9t c\u00e1ch t\u1ed5ng qu\u00e1t: $ \\overline{0,(a_{1}a_{2}...a_{n})} = \\dfrac{\\overline{a_{1}a_{2}...a_{n}}}{\\underbrace{999...9}_{n}} $ <br\/> <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $A = 0,(36) - 0,(71) \\\\ = \\dfrac{36}{99} - \\dfrac{71}{99} \\\\ = \\dfrac{36 - 71}{99} = \\dfrac{-35}{99} = -0,(35) $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D. <\/span><\/span> ","column":4}]}],"id_ques":375},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> So s\u00e1nh hai s\u1ed1 0,53 v\u00e0 0,(53) th\u00ec: ","select":["A. 0,53 = 0,(53) ","B. 0,53 < 0,(53) ","C. 0,53 > 0,(53) "],"explain":" Ta c\u00f3: $ 0,53 = 0,53 $ <br\/> $ 0,(53) = 0,535353... $ <br\/> M\u00e0 $0,53 < 0,535353... $<br\/> Suy ra 0,53 < 0,(53) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":3}]}],"id_ques":376},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> So s\u00e1nh hai s\u1ed1 0,22(23) v\u00e0 0,2223 ta \u0111\u01b0\u1ee3c: ","select":["A. 0,22(23) = 0,2223 ","B. 0,22(23) < 0,2223 ","C. 0,22(23) > 0,2223 "],"explain":" Ta c\u00f3: 0,22(23) = 0,22232323... <br\/> 0,2223 = 0,2223 <br\/> M\u00e0 0,22232323...> 0,2223 <br\/> Suy ra 0,22(23) > 0,2223 <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":3}]}],"id_ques":377},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-5"],["33"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Vi\u1ebft s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n sau d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1: <br\/> -0,(15) = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> \u0110\u1ed5i s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n th\u00e0nh ph\u00e2n s\u1ed1 <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i <\/i> <\/u> <br\/> S\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n c\u00f3 <i> chu k\u00ec <\/i> ngay sau d\u1ea5u ph\u1ea9y. <br\/> <u> C\u00e1ch chuy\u1ec3n<\/u>: L\u1ea5y ph\u1ea7n nguy\u00ean c\u1ee7a n\u00f3 + ph\u00e2n s\u1ed1 [ c\u00f3 <b> t\u1eed s\u1ed1 <\/b> l\u00e0 s\u1ed1 chu k\u00ec; <b> m\u1eabu s\u1ed1 <\/b> l\u00e0 s\u1ed1 g\u1ed3m c\u00e1c ch\u1eef s\u1ed1 9 (s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 9 b\u1eb1ng s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a chu k\u00ec)] <br\/> * M\u1ed9t c\u00e1ch t\u1ed5ng qu\u00e1t: $ \\overline{0,(a_{1}a_{2}...a_{n})} = \\dfrac{\\overline{a_{1}a_{2}...a_{n}}}{\\underbrace{999...9}_{n}} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $ -0,(15) = -\\dfrac{15}{99} = \\dfrac{-5}{33}$ <br\/> <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 l\u00e0 $\\dfrac{-5}{33}$ <\/span><\/span>"}]}],"id_ques":378},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["5"],["37"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Vi\u1ebft s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n sau d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1: <br\/> 0,(135) = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> \u0110\u1ed5i s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n th\u00e0nh ph\u00e2n s\u1ed1 <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i <\/i> <\/u> <br\/> S\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n c\u00f3 <i> chu k\u00ec <\/i> ngay sau d\u1ea5u ph\u1ea9y. <br\/> <u> C\u00e1ch chuy\u1ec3n<\/u>: L\u1ea5y ph\u1ea7n nguy\u00ean c\u1ee7a n\u00f3 + ph\u00e2n s\u1ed1 [ c\u00f3 <b> t\u1eed s\u1ed1 <\/b> l\u00e0 s\u1ed1 chu k\u00ec; <b> m\u1eabu s\u1ed1 <\/b> l\u00e0 s\u1ed1 g\u1ed3m c\u00e1c ch\u1eef s\u1ed1 9 (s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 9 b\u1eb1ng s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a chu k\u00ec)] <br\/> * M\u1ed9t c\u00e1ch t\u1ed5ng qu\u00e1t: $ \\overline{0,(a_{1}a_{2}...a_{n})} = \\dfrac{\\overline{a_{1}a_{2}...a_{n}}}{\\underbrace{999...9}_{n}} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $0,(135) = \\dfrac{135}{999} = \\dfrac{5}{37}$ <br\/> <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 l\u00e0 $\\dfrac{5}{37}$ <\/span><\/span>"}]}],"id_ques":379},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Vi\u1ebft s\u1ed1 th\u1eadp ph\u00e2n 0,(7) d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n ","select":["A. $\\dfrac{7}{9}$ ","B. $\\dfrac{7}{10}$","C. $\\dfrac{1}{7}$","D. $\\dfrac{1}{14}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> \u0110\u1ed5i s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n th\u00e0nh ph\u00e2n s\u1ed1 <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i <\/i> <\/u> <br\/> S\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n \u0111\u01a1n c\u00f3 <i> chu k\u00ec <\/i> ngay sau d\u1ea5u ph\u1ea9y. <br\/> <u> C\u00e1ch chuy\u1ec3n<\/u>: L\u1ea5y ph\u1ea7n nguy\u00ean c\u1ee7a n\u00f3 + ph\u00e2n s\u1ed1 [ c\u00f3 <b> t\u1eed s\u1ed1 <\/b> l\u00e0 s\u1ed1 chu k\u00ec; <b> m\u1eabu s\u1ed1 <\/b> l\u00e0 s\u1ed1 g\u1ed3m c\u00e1c ch\u1eef s\u1ed1 9 (s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 9 b\u1eb1ng s\u1ed1 c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a chu k\u00ec)]. <br\/> * M\u1ed9t c\u00e1ch t\u1ed5ng qu\u00e1t: $ \\overline{0,(a_{1}a_{2}...a_{n})} = \\dfrac{\\overline{a_{1}a_{2}...a_{n}}}{\\underbrace{999...9}_{n}} $ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $0,(7) = \\dfrac{7}{9} $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":4}]}],"id_ques":380},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Ph\u00e2n s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n h\u1eefu h\u1ea1n? ","select":["A. $\\dfrac{8}{15}$ ","B. $\\dfrac{21}{35}$","C. $\\dfrac{12}{27}$","D. $\\dfrac{26}{39}$"],"hint":" Ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n h\u1eefu h\u1ea1n n\u1ebfu m\u1eabu s\u1ed1 kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5","explain":" Ta c\u00f3: $\\dfrac{8}{15} $ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $15 = 3.5 $ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{21}{35} = \\dfrac{3}{5} $ ; m\u1eabu s\u1ed1 l\u00e0 $5$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{12}{27} = \\dfrac{4}{9} $; m\u1eabu s\u1ed1 l\u00e0 $9 = 3^{2}$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{26}{39} = \\dfrac{2}{3}$; m\u1eabu s\u1ed1 l\u00e0 $3$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> V\u1eady ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n h\u1eefu h\u1ea1n l\u00e0 $\\dfrac{21}{35}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":381},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Ph\u00e2n s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n? ","select":["A. $\\dfrac{65}{30}$ ","B. $\\dfrac{33}{100}$","C. $\\dfrac{63}{140}$","D. $\\dfrac{45}{60}$"],"hint":" Ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n n\u1ebfu m\u1eabu s\u1ed1 c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5 ","explain":"<span class='basic_left'> Ta c\u00f3: $\\dfrac{65}{30} = \\dfrac{13}{6}$; m\u1eabu s\u1ed1 l\u00e0 $6 = 2.3$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{33}{100} $ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $100 = 2^{2}.5^{2}$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{63}{140} = \\dfrac{9}{20} $; m\u1eabu s\u1ed1 l\u00e0 $20 = 2^{2}.5$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{45}{60} = \\dfrac{3}{4}$; m\u1eabu s\u1ed1 l\u00e0 $4 = 2^{2}$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> V\u1eady ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n l\u00e0 $\\dfrac{65}{30}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":4}]}],"id_ques":382},{"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/lop7/toan/daiso/bai8/lv2/img\/2.jpg' \/><\/center> Ph\u00e2n s\u1ed1 $\\dfrac{2}{-9}$ vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n l\u00e0: ","select":["A. $-0,(02) $","B. $ -0,(2)$","C. $ -0,2$","D. $ -0,0(2)$"],"hint":" Chia t\u1eed s\u1ed1 cho m\u1eabu s\u1ed1","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> Vi\u1ebft m\u1ed9t ph\u00e2n s\u1ed1 ho\u1eb7c m\u1ed9t t\u1ec9 s\u1ed1 d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i: <\/i> <\/u> <br\/> Ta chia t\u1eed s\u1ed1 cho m\u1eabu s\u1ed1. <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $\\dfrac{2}{-9} = \\dfrac{-2}{9} = -0,2222... = -0,(2)$ (ta chia -2 cho 9) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":383},{"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/lop7/toan/daiso/bai8/lv2/img\/2.jpg' \/><\/center> Ph\u00e2n s\u1ed1 $\\dfrac{1016}{999}$ vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n l\u00e0: ","select":["A. 0,0(17) ","B. 1,(017)","C. 1,0(17)","D. 0,(017)"],"hint":" Chia t\u1eed s\u1ed1 cho m\u1eabu s\u1ed1","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> Vi\u1ebft m\u1ed9t ph\u00e2n s\u1ed1 ho\u1eb7c m\u1ed9t t\u1ec9 s\u1ed1 d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i: <\/i> <\/u> <br\/> Ta chia t\u1eed s\u1ed1 cho m\u1eabu s\u1ed1. <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $\\dfrac{1016}{999} = 1,017017017... = 1,(017)$ (ta chia 1016 cho 999) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":384},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-7"],["40"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Vi\u1ebft s\u1ed1 th\u1eadp ph\u00e2n $-0,175$ d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n <br\/> <br\/> <u> \u0110\u00e1p s\u1ed1:<\/u> <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Vi\u1ebft s\u1ed1 th\u1eadp ph\u00e2n h\u1eefu h\u1ea1n d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n<\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i <\/i> <\/u> <br\/> D\u1ef1a v\u00e0o nh\u1eadn x\u00e9t: <br\/> * Ph\u1ea7n th\u1eadp ph\u00e2n c\u00f3 n ch\u1eef s\u1ed1 th\u00ec \u1edf m\u1eabu s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1 l\u00e0 $10^{n}.$ <br\/> * Cu\u1ed1i c\u00f9ng r\u00fat g\u1ecdn ph\u00e2n s\u1ed1 v\u1eeba l\u1eadp \u0111\u01b0\u1ee3c. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $-0,175 = \\dfrac{-175}{1000} = \\dfrac{-7}{40}$ <br\/> <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 l\u00e0 $\\dfrac{-7}{40}$ <\/span><\/span>"}]}],"id_ques":385},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Ph\u00e2n s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n? ","select":["A. $\\dfrac{-7}{20}$ ","B. $\\dfrac{8}{27}$","C. $\\dfrac{21}{125}$","D. $\\dfrac{-21}{50}$"],"hint":" Ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n n\u1ebfu m\u1eabu s\u1ed1 kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5","explain":"<span class='basic_left'> Ta c\u00f3: $\\dfrac{-7}{20}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $20 = 2^{2}.5$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{8}{27}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $27 = 3^{3}$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{21}{125}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $125 = 5^{3}$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $ \\dfrac{21}{-50} = \\dfrac{-21}{50}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $50 = 2.5^{2}$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> V\u1eady ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n l\u00e0 $\\dfrac{8}{27}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":386},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Trong b\u1ed1n ph\u00e2n s\u1ed1 d\u01b0\u1edbi \u0111\u00e2y, c\u00f3 m\u1ea5y ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n? <br\/> $\\dfrac{4}{11}; \\dfrac{15}{22}; \\dfrac{14}{35}; \\dfrac{-7}{22}$ ","select":["A. 1","B. 2","C. 3","D. 4"],"explain":"<span class='basic_left'> Ta c\u00f3: $\\dfrac{4}{11}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $11$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{15}{22}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $22 = 2.11$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{14}{35} = \\dfrac{2}{5}$; m\u1eabu s\u1ed1 l\u00e0 $5$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/>$\\dfrac{-7}{24}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $24 = 2^{3}.3$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> V\u1eady c\u00f3 ba ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n. <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}],"id_ques":387},{"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/lop7/toan/daiso/bai8/lv2/img\/2.jpg' \/><\/center> Ph\u00e2n s\u1ed1 $\\dfrac{1}{99}$ vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n l\u00e0: ","select":["A. 0,(01) ","B. 0,00(1)","C. 0,(1)","D. 0,1"],"hint":" Chia t\u1eed s\u1ed1 cho m\u1eabu s\u1ed1","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> Vi\u1ebft m\u1ed9t ph\u00e2n s\u1ed1 ho\u1eb7c m\u1ed9t t\u1ec9 s\u1ed1 d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n <\/b> <br\/> <i> <u> Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i: <\/i> <\/u> <br\/> Ta chia t\u1eed s\u1ed1 cho m\u1eabu s\u1ed1. <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $\\dfrac{1}{99} = 0,010101... = 0,(01)$ (ta chia 1 cho 99) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":4}]}],"id_ques":388},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Ph\u00e2n s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n? ","select":["A. $\\dfrac{5}{6}$ ","B. $\\dfrac{19}{4}$","C. $\\dfrac{14}{40}$","D. $\\dfrac{16}{50}$"],"explain":" Ta c\u00f3: $\\dfrac{5}{6}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $6 = 2.3$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{19}{4}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 $4 = 2^{2}$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{14}{40} = \\dfrac{7}{20}$; m\u1eabu s\u1ed1 $20 = 2^{2}.5$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/>$\\dfrac{16}{50} = \\dfrac{8}{25}$; m\u1eabu s\u1ed1 $25 = 5^{2}$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> V\u1eady ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n v\u00f4 h\u1ea1n tu\u1ea7n ho\u00e0n l\u00e0 $\\dfrac{5}{6}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":4}]}],"id_ques":389},{"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/lop7/toan/daiso/bai8/lv2/img\/7.jpg' \/><\/center> Ph\u00e2n s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n h\u1eefu h\u1ea1n? ","select":["A. $\\dfrac{8}{27}$ ","B. $\\dfrac{-13}{30}$","C. $\\dfrac{7}{-20}$","D. $\\dfrac{8}{9}$"],"explain":" Ta c\u00f3:$\\dfrac{8}{27}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 l\u00e0 $27 = 3^{3}$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{-13}{30}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 30 = 2.5.3 (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/>$\\dfrac{7}{-20} = \\dfrac{-7}{20}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 $20 = 2^{2}.5$ (kh\u00f4ng ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> $\\dfrac{8}{9}$ l\u00e0 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n; m\u1eabu s\u1ed1 $9 = 3^{2}$ (c\u00f3 ch\u1ee9a th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 kh\u00e1c 2 v\u00e0 5) <br\/> V\u1eady ph\u00e2n s\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n h\u1eefu h\u1ea1n l\u00e0 $\\dfrac{7}{-20}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}],"id_ques":390}],"lesson":{"save":0,"level":2}}