1. Вычислите: а) 2 3/30 : 3 1/9; б) 9/25 : 2 7/10; в) 4 3/8 : 5/9.

1. а) \(2\frac{3}{30}=2\frac{1}{10}=\frac{21}{10}\), \(3\frac{1}{9}=\frac{28}{9}\).
   \[\frac{21}{10}:\frac{28}{9}=\frac{21}{10}\cdot\frac{9}{28}=\frac{27}{40}.\]
2. б) \(2\frac{7}{10}=\frac{27}{10}\).
   \[\frac{9}{25}:\frac{27}{10}=\frac{9}{25}\cdot\frac{10}{27}=\frac{2}{15}.\]
3. в) \(4\frac{3}{8}=\frac{35}{8}\).
   \[\frac{35}{8}:\frac{5}{9}=\frac{35}{8}\cdot\frac{9}{5}=\frac{63}{8}=7\frac{7}{8}.\]

Ответ: а) \(\frac{27}{40}\); б) \(\frac{2}{15}\); в) \(7\frac{7}{8}\).