3) \(7\frac{3}{8} - 2\frac{1}{8} = \)

\(7\frac{3}{8} - 2\frac{1}{8} = (7 - 2) + (\frac{3}{8} - \frac{1}{8}) = 5 + \frac{2}{8} = 5\frac{2}{8}\)

Ответ: \(5\frac{2}{8}\)