335. Найдите произведение: 1) \(\frac{2}{7}\cdot\frac{3}{5}\); 2) \(\frac{3}{4}\cdot\frac{5}{6}\); 3) \(\frac{4}{7}\cdot\frac{7}{9}\); 4) \(\frac{15}{16}\cdot\frac{48}{55}\).

1. \(\frac{2}{7}\cdot\frac{3}{5}=\frac{6}{35}\).
2. \(\frac{3}{4}\cdot\frac{5}{6}=\frac{15}{24}=\frac{5}{8}\).
3. \(\frac{4}{7}\cdot\frac{7}{9}=\frac{4}{9}\).
4. \(\frac{15}{16}\cdot\frac{48}{55}=\frac{15\cdot3}{55}=\frac{45}{55}=\frac{9}{11}\).

Ответ: 1) \(\frac{6}{35}\); 2) \(\frac{5}{8}\); 3) \(\frac{4}{9}\); 4) \(\frac{9}{11}\).