Решение:
- a) \(5\frac{1}{4}: \frac{5}{7} = \frac{21}{4} : \frac{5}{7} = \frac{21}{4} \cdot \frac{7}{5} = \frac{147}{20} = 7\frac{7}{20}\)
- б) \(2\frac{2}{13}: 26 = \frac{28}{13} : 26 = \frac{28}{13} \cdot \frac{1}{26} = \frac{14}{13 \cdot 13} = \frac{14}{169}\)
Ответ: a) 7\(\frac{7}{20}\); б) \(\frac{14}{169}\).