Вычислите: 1) \(\frac{2}{3}+\frac{5}{8}\); 2) \(\frac{7}{12}-\frac{3}{8}\); 3) \(\frac{11}{16}-\frac{5}{8}\).

1. \(\frac{2}{3}+\frac{5}{8}=\frac{16}{24}+\frac{15}{24}=\frac{31}{24}=1\frac{7}{24}\).
2. \(\frac{7}{12}-\frac{3}{8}=\frac{14}{24}-\frac{9}{24}=\frac{5}{24}\).
3. \(\frac{11}{16}-\frac{5}{8}=\frac{11}{16}-\frac{10}{16}=\frac{1}{16}\).

Ответ: 1) \(1\frac{7}{24}\); 2) \(\frac{5}{24}\); 3) \(\frac{1}{16}\).