Ответ:

  1. а) \(9-2\frac{1}{5}=6\frac{4}{5}\);
  2. б) \(3-\frac{1}{3}=2\frac{2}{3}\);
  3. в) \(7-\frac{3}{4}=6\frac{1}{4}\);
  4. г) \(6-5\frac{5}{6}=\frac{1}{6}\);
  5. д) \(7-3\frac{7}{9}=3\frac{2}{9}\);
  6. е) \(7-5\frac{4}{10}=1\frac{6}{10}=1\frac{3}{5}\);
  7. ж) \(1-\frac{20}{30}=1-\frac{2}{3}=\frac{1}{3}\);
  8. з) \(1-\frac{2}{7}=\frac{5}{7}\).