`3 2/5 = (3xx5+2)/5 = 17/5`
`12 1/4 =(12xx4+1)/4 = 49/4`
`3 5/8 = (3xx8+5)/8 = 29/8`
`5 4/9 = (5xx9+4)/9 = 49/9`
\(3\dfrac{2}{5}=\dfrac{17}{5}\\ 12\dfrac{1}{4}=\dfrac{12.4+1}{4}=\dfrac{49}{4}\\ 3\dfrac{5}{8}=\dfrac{3.8+5}{8}=\dfrac{29}{8}\\ 5\dfrac{4}{9}=\dfrac{5.9+4}{9}=\dfrac{49}{9}\)
\(\dfrac{12}{5}\), \(\dfrac{49}{4}\), \(\dfrac{29}{8}\),\(\dfrac{49}{9}\)
`3 2/5=17/5`
`12 1/4=49/4`
`3 5/8=19/8`
`5 4/9=49/9`

4 và 5