3) Вычислите: 1) \(\frac{4}{15}+\frac{3}{4}\); 2) \(\frac{5}{6}-\frac{9}{14}\); 3) \(4\frac{4}{7}+6\frac{1}{4}\); 4) \(5\frac{7}{8}-3\frac{5}{6}\).

1. \(\frac{4}{15}+\frac{3}{4}=\frac{16}{60}+\frac{45}{60}=\frac{61}{60}=1\frac{1}{60}\).
2. \(\frac{5}{6}-\frac{9}{14}=\frac{35}{42}-\frac{27}{42}=\frac{8}{42}=\frac{4}{21}\).
3. \(4\frac{4}{7}+6\frac{1}{4}=10+\frac{16}{28}+\frac{7}{28}=10\frac{23}{28}\).
4. \(5\frac{7}{8}-3\frac{5}{6}=2+\frac{21}{24}-\frac{20}{24}=2\frac{1}{24}\).

Ответ: 1) \(1\frac{1}{60}\); 2) \(\frac{4}{21}\); 3) \(10\frac{23}{28}\); 4) \(2\frac{1}{24}\).