№1. Вычислите: 1) \(\frac{7}{8}+\frac{5}{6}\); 2) \(\frac{11}{12}-\frac{3}{4}\); 3) \(\frac{5}{14}+\frac{1}{7}\); 4) \(\frac{13}{15}-\frac{2}{5}\).

1. Общий знаменатель равен 24: \(\frac{7}{8}+\frac{5}{6}=\frac{21}{24}+\frac{20}{24}=\frac{41}{24}=1\frac{17}{24}\).
2. \(\frac{11}{12}-\frac{3}{4}=\frac{11}{12}-\frac{9}{12}=\frac{2}{12}=\frac{1}{6}\).
3. \(\frac{5}{14}+\frac{1}{7}=\frac{5}{14}+\frac{2}{14}=\frac{7}{14}=\frac{1}{2}\).
4. \(\frac{13}{15}-\frac{2}{5}=\frac{13}{15}-\frac{6}{15}=\frac{7}{15}\).

Ответ: 1) \(1\frac{17}{24}\); 2) \(\frac{1}{6}\); 3) \(\frac{1}{2}\); 4) \(\frac{7}{15}\).