2. Вычислите: а) \(2\frac{1}{7}\cdot2\frac{4}{5}\); б) \(2\frac{1}{16}:2\frac{5}{14}\); в) \(3\frac{1}{6}:2\frac{1}{9}\cdot1\frac{5}{9}\).

1. \(2\frac{1}{7}\cdot2\frac{4}{5}=\frac{15}{7}\cdot\frac{14}{5}=6\).
2. \(2\frac{1}{16}:2\frac{5}{14}=\frac{33}{16}:\frac{33}{14}=\frac{33}{16}\cdot\frac{14}{33}=\frac{7}{8}\).
3. \(3\frac{1}{6}:2\frac{1}{9}\cdot1\frac{5}{9}=\frac{19}{6}:\frac{19}{9}\cdot\frac{14}{9}=\frac{19}{6}\cdot\frac{9}{19}\cdot\frac{14}{9}=\frac{7}{3}\).

Ответ: а) \(6\); б) \(\frac{7}{8}\); в) \(\frac{7}{3}=2\frac{1}{3}\).