Ответ:

  1. \(\frac{9}{5}\cdot\frac{2}{3}=\frac{6}{5}=1.2\).
  2. \(\frac{5}{3}\cdot\frac{9}{2}=\frac{15}{2}=7.5\).
  3. \(\frac{5}{6}-\frac{3}{14}=\frac{35-9}{42}=\frac{26}{42}=\frac{13}{21}\).
  4. \(6\frac{1}{2}-\frac{47}{10}=\frac{65}{10}-\frac{47}{10}=\frac{18}{10}=\frac{9}{5}=1.8\).
  5. \(\frac{3}{5}-\frac{2}{7}=\frac{21-10}{35}=\frac{11}{35}\).