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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{72\times75}{125\times108}\) = \(\dfrac{36\times2\times25\times3}{25\times5\times36\times3}\) = \(\dfrac{2}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
12:
a: 40*7*25=8*5*7*25 chia hết cho 8
b: 32*19*28=8*4*19*28 chia hết cho 8
c: 4*35*2*39=8*35*39 chia hết cho 8
d: 14*27*4*15=2*4*7*27*15=8*7*25*15 chia hết cho 8
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4.7}{9.32}=\frac{2^2.7}{3^2.2^5}=\frac{7}{3^2.2^3}=\frac{7}{72}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(\dfrac{56}{70}=\dfrac{56:14}{70:14}=\dfrac{4}{5}\)
b)\(\dfrac{-120}{86}=\dfrac{-120:2}{86:2}=-\dfrac{60}{43}\)
c)\(\dfrac{915+85}{1017-117}=\dfrac{1000}{900}=\dfrac{10}{9}\)
d)\(\dfrac{3838}{5454}=\dfrac{19}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{32.9.11}{12.24.22}\) = \(\dfrac{8.4.3.3.11}{3.4.8.3.11.2}\) = \(\dfrac{1}{2}\)
\(\dfrac{32.9.11}{12.24.22}=\dfrac{8.4.3.3.11}{3.4.8.3.11.2}=\dfrac{1}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đặt A = 2 + 22 + 23 + 24 + ... + 299
2A = 22 + 23 + 24 + 25 + ... + 2100
2A - A = (22 + 23 + 24 + 25 + ... + 2100) - (2 + 22 + 23 + 24 + ... + 299)
A = 2100 - 2
\(\dfrac{3001500}{1010012}=\dfrac{3001500:116}{1010012:116}=\dfrac{25875}{8707}\)