Ответ:

  1. а) \(8-3\frac{6}{7}=5-\frac{6}{7}=4\frac{1}{7}\).

  2. б) \(2\frac{1}{8}+3\frac{5}{12}=5+\frac{3}{24}+\frac{10}{24}=5\frac{13}{24}\).

  3. в) \(5\frac{13}{15}+1\frac{7}{12}=6+\frac{52}{60}+\frac{35}{60}=7\frac{27}{60}=7\frac{9}{20}\).

  4. г) \(7\frac{3}{8}-3\frac{5}{6}=4+\frac{9}{24}-\frac{20}{24}=3\frac{13}{24}\).

Ответ: а) \(4\frac{1}{7}\); б) \(5\frac{13}{24}\); в) \(7\frac{9}{20}\); г) \(3\frac{13}{24}\).