г) \(6\frac{4}{5}+\frac{1}{5}=\); \(1-\frac{1}{2}=\); \(1-\frac{3}{4}=\)

\(6\frac{4}{5}+\frac{1}{5}=6+\frac{5}{5}=7\).

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

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

Ответ: \(7;\ \frac{1}{2};\ \frac{1}{4}\).