Контрольная работа № 4. 1. Выполните деление: 1) \(\frac{7}{15}:\frac{14}{25}\); 2) \(\frac{8}{13}:4\); 3) \(9:\frac{27}{28}\); 4) \(2\frac{2}{9}:1\frac{7}{9}\).

1. \(\frac{7}{15}:\frac{14}{25}=\frac{7}{15}\cdot\frac{25}{14}=\frac{5}{6}\).
2. \(\frac{8}{13}:4=\frac{8}{13}\cdot\frac14=\frac{2}{13}\).
3. \(9:\frac{27}{28}=9\cdot\frac{28}{27}=\frac{28}{3}=9\frac13\).
4. \(2\frac29:1\frac79=\frac{20}{9}:\frac{16}{9}=\frac54=1\frac14\).

Ответ: 1) \(\frac56\); 2) \(\frac{2}{13}\); 3) \(9\frac13\); 4) \(1\frac14\).