Ответ:

  1. а) \(8-y=4\frac{1}{7}\).

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

  2. б) \(4\frac{3}{8}+x=6\frac{1}{8}\).

    \(x=6\frac{1}{8}-4\frac{3}{8}=1\frac{6}{8}=1\frac{3}{4}\).

  3. в) \(8\frac{7}{39}-x=5\frac{9}{26}\).

    \(x=8\frac{7}{39}-5\frac{9}{26}=8\frac{14}{78}-5\frac{27}{78}=2\frac{65}{78}=2\frac{5}{6}\).

  4. г) \(y+3\frac{11}{52}=8\frac{7}{39}\).

    \(y=8\frac{7}{39}-3\frac{11}{52}=8\frac{28}{156}-3\frac{33}{156}=4\frac{151}{156}\).

Ответ: а) \(y=3\frac{6}{7}\); б) \(x=1\frac{3}{4}\); в) \(x=2\frac{5}{6}\); г) \(y=4\frac{151}{156}\).