Вычислите: \(\frac{2}{5}\cdot\left(-\frac{3}{10}\right)\); \(\frac{4}{5}\cdot\left(-\frac{1}{3}\right)\).

1. \(\frac{2}{5}\cdot\left(-\frac{3}{10}\right)=-\frac{2\cdot3}{5\cdot10}=-\frac{6}{50}=-\frac{3}{25}\).
2. \(\frac{4}{5}\cdot\left(-\frac{1}{3}\right)=-\frac{4\cdot1}{5\cdot3}=-\frac{4}{15}\).

Ответ: \(-\frac{3}{25};\ -\frac{4}{15}\).