1. Выполните умножение: 1) 5/6 · 3/20; 2) 8/7 · 6/11; 3) 10/11 · 11/26; 4) 24/65 · 39/40.

1. \(\frac{5}{6}\cdot\frac{3}{20}=\frac{15}{120}=\frac{1}{8}\).
2. \(\frac{8}{7}\cdot\frac{6}{11}=\frac{48}{77}\).
3. \(\frac{10}{11}\cdot\frac{11}{26}=\frac{10}{26}=\frac{5}{13}\).
4. \(\frac{24}{65}\cdot\frac{39}{40}=\frac{3}{5}\cdot\frac{3}{5}=\frac{9}{25}\).

Ответ: 1) \(\frac{1}{8}\); 2) \(\frac{48}{77}\); 3) \(\frac{5}{13}\); 4) \(\frac{9}{25}\).