а) \(\frac47:\frac{16}{49}=\frac47\cdot\frac{49}{16}=\frac74\).
б) \(\frac59:\frac12=\frac59\cdot2=\frac{10}{9}=1\frac19\).
в) \(\frac{12}{25}:\frac8{15}=\frac{12}{25}\cdot\frac{15}{8}=\frac9{10}\).
г) \(\frac9{14}:\frac{18}{35}=\frac9{14}\cdot\frac{35}{18}=\frac54=1\frac14\).