Ответ:

  1. а) \(\frac{3}{8}+\frac{1}{6}=\frac{9}{24}+\frac{4}{24}=\frac{13}{24}\).
  2. б) \(\frac{4}{5}+\frac{3}{10}=\frac{8}{10}+\frac{3}{10}=\frac{11}{10}=1\frac{1}{10}\).
  3. в) \(\frac{1}{12}+\frac{3}{10}=\frac{5}{60}+\frac{18}{60}=\frac{23}{60}\).
  4. г) \(\frac{9}{20}-\frac{1}{30}=\frac{27}{60}-\frac{2}{60}=\frac{25}{60}=\frac{5}{12}\).
  5. д) \(1-\frac{4}{9}=\frac{9}{9}-\frac{4}{9}=\frac{5}{9}\).
  6. е) \(4-\frac{3}{8}=\frac{32}{8}-\frac{3}{8}=\frac{29}{8}=3\frac{5}{8}\).
  7. ж) \(8-3\frac{3}{4}=4\frac{4}{4}-3\frac{3}{4}=4\frac{1}{4}\).
  8. з) \(4-2\frac{5}{9}=3\frac{9}{9}-2\frac{5}{9}=1\frac{4}{9}\).

Ответ: а) \(\frac{13}{24}\); б) \(1\frac{1}{10}\); в) \(\frac{23}{60}\); г) \(\frac{5}{12}\); д) \(\frac{5}{9}\); е) \(3\frac{5}{8}\); ж) \(4\frac{1}{4}\); з) \(1\frac{4}{9}\).