Ответ:

1.

  1. \(\frac{5}{6}\cdot\frac{3}{20}=\frac{15}{120}=\frac{1}{8}\);
  2. \(\frac{3}{7}\cdot\frac{6}{11}=\frac{18}{77}\);
  3. \(\frac{10}{11}\cdot\frac{6}{26}=\frac{60}{286}=\frac{30}{143}\).
  4. \(\frac{24}{65}\cdot\frac{39}{40}=\frac{9}{25}\).

2.

  1. \(4\cdot\frac{2}{41}=\frac{8}{41}\);
  2. \(6\cdot\frac{7}{18}=\frac{7}{3}=2\frac{1}{3}\);
  3. \(\frac{5}{14}\cdot28=10\).