13. \(\frac{5}{12}\cdot\frac{18}{25}=\)

Сократим: \(\frac{5}{25}=\frac{1}{5}\), \(\frac{18}{12}=\frac{3}{2}\).

\(\frac{5}{12}\cdot\frac{18}{25}=\frac{1}{2}\cdot\frac{3}{5}=\frac{3}{10}\).

Ответ: \(\frac{3}{10}\)