Ответ:
- \(\frac{5}{6}\cdot\frac{3}{20}=\frac{15}{120}=\frac{1}{8}\).
- \(\frac{3}{7}\cdot\frac{6}{11}=\frac{18}{77}\).
- \(\frac{10}{11}\cdot\frac{11}{26}=\frac{10}{26}=\frac{5}{13}\).
- \(\frac{24}{85}\cdot\frac{39}{40}=\frac{936}{3400}=\frac{117}{425}\).
Ответ: 1) \(\frac{1}{8}\); 2) \(\frac{18}{77}\); 3) \(\frac{5}{13}\); 4) \(\frac{117}{425}\).
