11. \(\frac{7}{10}\cdot2\frac{6}{7}\cdot1\frac{5}{9}=\)

\(2\frac{6}{7}=\frac{20}{7}\), \(1\frac{5}{9}=\frac{14}{9}\).

\(\frac{7}{10}\cdot\frac{20}{7}\cdot\frac{14}{9}=2\cdot\frac{14}{9}=\frac{28}{9}=3\frac{1}{9}\).

Ответ: \(3\frac{1}{9}\).