в) \(\frac{7}{9}+3=\); \(1-\frac{3}{5}=\); \(1-\frac{7}{8}=\)

\(3+\frac{7}{9}=3\frac{7}{9}\).

\(1-\frac{3}{5}=\frac{5}{5}-\frac{3}{5}=\frac{2}{5}\).

\(1-\frac{7}{8}=\frac{8}{8}-\frac{7}{8}=\frac{1}{8}\).

Ответ: \(3\frac{7}{9};\ \frac{2}{5};\ \frac{1}{8}\).