$\frac{4}{5}:\frac{7}{15}=\frac{4}{5}\cdot \frac{15}{7}$  

$\frac{9}{17}:\frac{13}{29}=\frac{9}{17}\cdot \frac{29}{13}$ $\frac{9}{17}:\frac{13}{29}=\frac{9}{17}\cdot \frac{29}{13}$  

$\frac{27}{4}:\frac{5}{2}=\frac{27}{4}\cdot \frac{2}{5}$  

$3:\frac{7}{8}=3\cdot \frac{8}{7}$

$2\frac{4}{9}:\frac{23}{5}=2\frac{4}{9}\cdot \frac{5}{23}$