Ответ:

  1. а) \(\frac{5}{8}\cdot18=\frac{5\cdot18}{8}=\frac{5\cdot9}{4}=\frac{45}{4}=11\frac{1}{4}\).
  2. б) \(\frac{2}{5}\cdot14=\frac{2\cdot14}{5}=\frac{28}{5}=5\frac{3}{5}\).
  3. в) \(\frac{3}{8}\cdot20=\frac{3\cdot20}{8}=\frac{3\cdot5}{2}=\frac{15}{2}=7\frac{1}{2}\).
  4. г) \(\frac{6}{7}\cdot5=\frac{6\cdot5}{7}=\frac{30}{7}=4\frac{2}{7}\).
  5. д) \(16\cdot\frac{1}{8}=\frac{16}{8}=2\).
  6. е) \(15\cdot\frac{7}{25}=\frac{15\cdot7}{25}=\frac{3\cdot7}{5}=\frac{21}{5}=4\frac{1}{5}\).

Ответ: а) \(11\frac{1}{4}\); б) \(5\frac{3}{5}\); в) \(7\frac{1}{2}\); г) \(4\frac{2}{7}\); д) \(2\); е) \(4\frac{1}{5}\).