1. \(2\frac{5}{8} = \frac{2 \cdot 8 + 5}{8} = \frac{16 + 5}{8} = \frac{21}{8}\)
2. \(\frac{21}{8} : \frac{3}{4} = \frac{21}{8} \cdot \frac{4}{3} = \frac{21 \cdot 4}{8 \cdot 3} = \frac{84}{24} = \frac{7}{2} = 3.5\)
3. \(\frac{7}{2} + \frac{1}{2} = \frac{7 + 1}{2} = \frac{8}{2} = 4\)
Ответ: 4