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\(\frac{12}{25}\cdot\frac{39}{17}\cdot\frac{51}{52}=\frac{27}{25}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`12/25 xx 39/17 xx 51/25`
`= (12 xx 39 xx 51)/(25 xx 17 xx 25)`
`= (12 xx 39 xx 3 xx 17)/(25 xx 17 xx 25)`
`= (12 xx 39 xx 3)/(25xx 25)`
`= 468/625`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{39}{17}\cdot\dfrac{51}{52}=\dfrac{3}{4}\cdot3=\dfrac{9}{4}\)
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a) 21: 25 =\(\dfrac{21}{25}\)
30: 43 = \(\dfrac{30}{43}\)
61: 69 = \(\dfrac{61}{69}\)
17: 100 = \(\dfrac{17}{100}\)
b)9 : 4 = \(\dfrac{9}{4}\)
51: 7 = \(\dfrac{51}{7}\)
60 : 39 = \(\dfrac{60}{39}\)
200 : 163 = \(\dfrac{200}{163}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{51}{50};\dfrac{27}{26};\dfrac{25}{24};\dfrac{18}{17};\dfrac{4}{3}\)
\(\dfrac{51}{50}< \dfrac{27}{26}< \dfrac{25}{24}< \dfrac{26}{25}< \dfrac{18}{17}< \dfrac{4}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)