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a) ta có:
57/95 = 3/5
185/-296 = -5/8
64/-144 = -4/9
MC = 360
QĐ:
3/5(72) = 3.72/5.72 = 216/360
-5/8(45) = -5.45/8.45 = -225/360
-4/9(40) = -4.40/9.40 = -160/360
Vậy sau khi quy đồng mẫu nhiều phân số thì các phân số 57/95; 185/-296; 64/-144 trở thành 216/360; -225/360; -160/360
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a: =-3/7
b: =-3/5
c: =1/13
d: =-1/2
Bài 2:
a: \(=\dfrac{21\cdot11}{22\cdot9}=\dfrac{1}{2}\cdot\dfrac{7}{3}=\dfrac{7}{6}\)
b: \(=\dfrac{49\cdot8}{10}=\dfrac{196}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a \(\dfrac{-2}{5}\)
b -1
c \(\dfrac{2}{5}\)
d \(\dfrac{-18}{11}\)
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a: \(\dfrac{4\cdot5+4\cdot11}{8\cdot7+4\cdot3}=\dfrac{4\cdot16}{4\left(2\cdot7+3\right)}=\dfrac{16}{17}=\dfrac{11088}{11781}\)
\(\dfrac{-15\cdot8+10\cdot7}{5\cdot6+20\cdot3}=\dfrac{-120+170}{30+60}=\dfrac{50}{90}=\dfrac{5}{9}=\dfrac{6545}{11781}\)
\(\dfrac{2^4\cdot5^2\cdot7}{2^3\cdot5\cdot7^2\cdot11}=2\cdot5\cdot\dfrac{1}{77}=\dfrac{10}{77}=\dfrac{1530}{11781}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: -15/90=-1/6=-5/30
120/600=1/5=6/30
-75/150=-1/2=-15/30
b: -54/90=-3/5=-216/360
-180/288=-5/8=-225/360
-60/135=-4/9=-160/360
c: 212121/353535=3/5=42/70
131313/141414=13/14=65/70
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{38}{144}=\frac{38:2}{144:2}=\frac{19}{72}\)
\(\frac{22}{55}=\frac{22:11}{55:11}=\frac{2}{5}\)
\(\frac{21}{49}=\frac{21:7}{49:7}=\frac{3}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
e:
e1:40/-90=-4/9=-140/315
-70/-175=4/7=180/315
128/-1440=4/45=28/315
e2: 164/144=41/36
-936/-324=26/9=104/36
-860/720=43/36
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