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1-212121/353535=141414/353535=10101/353535
1-131313/141414=10101/141414
Vì
10101/141414>10101/353535
Nên
212121/353535>131313/141414
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3.4+3}{6.5+9}=\frac{3.(4+1)}{3.10.3.3}=\frac{3.5}{3.(10+3)}=\frac{3.5}{3.13}=\frac{5}{14}\)
\(\frac{6 . 9 - 2.17}{63 . 3 - 119}=\frac{3 . ( 17 + 1 )-2 . 17}{189 - 119}\)
\(=\frac{3.17+3-2.17}{70}=\frac{\left(3-2\right).17+3}{70}\)
\(=\frac{17+3}{70}=\frac{20}{70}=\frac{2}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1)Ta có : 212121/353535 = 212121:10101/353535:10101 = 21/35 = 3/5
131313/141414 = 131313:10101/141414:10101 = 13/14
Ta có : 3/5 = 42/70 ; 13/14 = 65/70
Vì 42<65 => 42/70<65/70 => 212121/353535<131313/141414
2)Ta có : 2012/2013<1
2013/2014<1
2014/2015<1
=> 2012/2013+ 2013/2014+ 2015/2012<1+1+1=3
Vậy 2012/2013+ 2013/2014+ 2015/2012<3
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Trả lời
Bài 1:
-5/80;7/16;-9/20
-5/80=-5/80
7/16=35/80
-9/20=-36/80
Bài 2:
-54/90=-6/10=-3/5=-216/360
-180/288=-20/32=-5/8=-225/360
60/-135=-12/27=-4/9=160/380
![](https://rs.olm.vn/images/avt/0.png?1311)
c 212121/353535
=212121:21/353535:35
=10101/10101
=212121:10101/353535:10101
=21/35
212121/353535=212121:10101/353535:10101=21/35=3/5
131313/141414=131313:10101/141414:10101=13/14
3/5=3x14/5x14=42/70=3/5
13/14=13x5/14x5=65/72=13/14
rút gọn: +) 212121/353535= 3*7*10101/ 5*7*10101= 3/5
+) 131313/141414= 13*10101/ 14*10101= 13/14
quy đồng: +) 3/5= 3*14/5*14= 42/70
+) 13/14=13*5/14*5=65/70