1. Выполните деление: 1) 7/15 : 14/25; 2) 8/13 : 4; 3) 9 : 27/28; 4) 2 2/9 : 1 7/9.

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

Ответ: 1) 5/6; 2) 2/13; 3) 9 1/3; 4) 1 1/4.