Ответ:
а) \(\frac{2}{5}:\frac{1}{2}=\frac{2}{5}\cdot2=\frac{4}{5}\).
б) \(\frac{2}{3}:\frac{2}{9}=\frac{2}{3}\cdot\frac{9}{2}=3\).
в) \(\frac{2}{9}:2=\frac{2}{9}\cdot\frac{1}{2}=\frac{1}{9}\).
Ответ: а) \(\frac{4}{5}\); б) 3; в) \(\frac{1}{9}\).
а) \(\frac{2}{5}:\frac{1}{2}=\frac{2}{5}\cdot2=\frac{4}{5}\).
б) \(\frac{2}{3}:\frac{2}{9}=\frac{2}{3}\cdot\frac{9}{2}=3\).
в) \(\frac{2}{9}:2=\frac{2}{9}\cdot\frac{1}{2}=\frac{1}{9}\).
Ответ: а) \(\frac{4}{5}\); б) 3; в) \(\frac{1}{9}\).