`3/2; 2/3` và `7/5`
Mẫu số chung : `30`
`3/2 = (3xx15)/(2xx15)=45/30`
`2/3=(2xx10)/(3xx10)=20/30`
`7/5=(7xx6)/(5xx6)=42/30`
Mẫu chung: 30
\(\dfrac{3}{2}=\dfrac{3\times15}{2\times15}=\dfrac{45}{30}\)
\(\dfrac{2}{3}=\dfrac{2\times10}{3\times10}=\dfrac{20}{30}\)
\(\dfrac{7}{5}=\dfrac{7\times6}{5\times6}=\dfrac{42}{30}\)