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20/45 = 4/9
14/35 = 2/7
-32/44 = -8/11
Chúc bạn học tốt !!! :)))
Đáp án :
\(\frac{20}{45}=\frac{20:5}{45:5}=\frac{4}{9}\)
\(\frac{14}{35}=\frac{14:7}{35:7}=\frac{2}{5}\)
\(\frac{-32}{44}=\frac{-32:4}{44:4}=\frac{-8}{11}\)
Hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(-\frac{72}{45}=\frac{-72:9}{45:9}=\frac{-8}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
bài 1
a, 1/4giowf b,5/3 giờ
bài 3
-6/17=-6/17 -25/75=-1/3 42/-98=24/-49 -12/27=-4/9
bài 2 dài lắm bạn ơi ,mình chỉ giúp đc vậy thôi
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
− 25 − 45 = 5 9 = 10 18 − 24 48 = − 1 2 = − 9 18
b)
1 5 = 7 35 − 2 = − 70 35 3 7 = 15 35
Ta có:
\(\dfrac{20}{45}=\dfrac{5}{9}\)
\(\dfrac{14}{35}=\dfrac{2}{5}\)
\(\dfrac{32}{44}=\dfrac{8}{11}\)
Mẫu số chung là: 495
\(\dfrac{5}{9}=\dfrac{5\cdot55}{9\cdot55}=\dfrac{275}{495}\)
\(\dfrac{2}{5}=\dfrac{2\cdot99}{5\cdot99}=\dfrac{198}{495}\)
\(\dfrac{8}{11}=\dfrac{8\cdot45}{11\cdot45}=\dfrac{360}{495}\)
\(\dfrac{20}{45}\) = \(\dfrac{4}{9}\) = \(\dfrac{4.5.11}{9.5.11}\) = \(\dfrac{220}{495}\)
\(\dfrac{14}{35}\) = \(\dfrac{2}{5}\) = \(\dfrac{2.9.11}{9.5.11}\) = \(\dfrac{198}{495}\)
\(\dfrac{32}{44}\) = \(\dfrac{8}{11}\) = \(\dfrac{8.9.5}{9.5.11}\)= \(\dfrac{360}{495}\)