1. Вычислите: \(\frac{2}{7}\cdot\frac{42}{5}\).

Сократим 42 и 7: \(\frac{42}{7}=6\).

\(\frac{2}{7}\cdot\frac{42}{5}=\frac{2\cdot6}{5}=\frac{12}{5}=2\frac{2}{5}\).

Ответ: \(2\frac{2}{5}\).