Ответ:

  1. а) \(\frac{3}{7}\cdot\frac{5}{11}=\frac{15}{77}\).
  2. б) \(\frac{6}{25}\cdot\frac{5}{18}=\frac{30}{450}=\frac{1}{15}\).
  3. в) \(3\frac{3}{5}\cdot1\frac{1}{9}=\frac{18}{5}\cdot\frac{10}{9}=4\).
  4. г) \(1\frac{3}{7}\cdot\frac{1}{14}=\frac{10}{7}\cdot\frac{1}{14}=\frac{5}{49}\).
  5. д) \(2\frac{1}{10}\cdot\frac{4}{7}=\frac{21}{10}\cdot\frac{4}{7}=\frac{6}{5}=1\frac{1}{5}\).

Ответ: а) \(\frac{15}{77}\); б) \(\frac{1}{15}\); в) 4; г) \(\frac{5}{49}\); д) \(1\frac{1}{5}\).