5.281. Вычислите: а) \(4\frac{1}{7}+12\frac{3}{7}\); б) \(9\frac{2}{13}+6\frac{12}{13}\); в) \(5\frac{4}{7}-1\frac{2}{7}\); г) \(4\frac{9}{10}-2\frac{12}{15}\).

1. \(4\frac{1}{7}+12\frac{3}{7}=16\frac{4}{7}\);
2. \(9\frac{2}{13}+6\frac{12}{13}=15\frac{14}{13}=16\frac{1}{13}\);
3. \(5\frac{4}{7}-1\frac{2}{7}=4\frac{2}{7}\);
4. \(4\frac{9}{10}-2\frac{12}{15}=4\frac{9}{10}-2\frac{4}{5}=2\frac{1}{10}\).

Ответ: а) \(16\frac{4}{7}\); б) \(16\frac{1}{13}\); в) \(4\frac{2}{7}\); г) \(2\frac{1}{10}\).