Ответ:

  1. а) \(\frac{9}{10}-\frac{1}{10}=\frac{8}{10}=\frac{4}{5}\).
  2. б) \(\frac{8}{15}+\frac{2}{15}=\frac{10}{15}=\frac{2}{3}\).
  3. в) \(\frac{6}{15}-\frac{1}{15}=\frac{5}{15}=\frac{1}{3}\).
  4. г) \(\frac{1}{4}+\frac{2}{8}=\frac{2}{8}+\frac{2}{8}=\frac{4}{8}=\frac{1}{2}\).
  5. д) \(\frac{10}{16}-\frac{6}{16}=\frac{4}{16}=\frac{1}{4}\).
  6. е) \(\frac{1}{9}+\frac{5}{9}=\frac{6}{9}=\frac{2}{3}\).

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