Вычисли: а) \(7\frac{3}{5}:\frac{19}{20}\); б) \(\frac{5}{7}:5\); в) \(6:1\frac{3}{9}\).

1. \[7\frac{3}{5}:\frac{19}{20}=\frac{38}{5}\cdot\frac{20}{19}=8.\]
2. \[\frac{5}{7}:5=\frac{5}{7}\cdot\frac{1}{5}=\frac{1}{7}.\]
3. \[6:1\frac{3}{9}=6:\frac{4}{3}=6\cdot\frac{3}{4}=\frac{9}{2}=4\frac{1}{2}.\]

Ответ: а) 8; б) \(\frac{1}{7}\); в) \(4\frac{1}{2}\).