2. \(7\frac{2}{8}-4\frac{6}{8}\)

\[7\frac{2}{8}-4\frac{6}{8}=6\frac{10}{8}-4\frac{6}{8}=2\frac{4}{8}=2\frac{1}{2}.\]

Ответ: \(2\frac{1}{2}\).