1) \(\left(\frac{3}{7}+\frac{3}{5}\right):\frac{9}{7}=\left(\frac{15}{35}+\frac{21}{35}\right)\cdot\frac{7}{9}=\frac{36}{35}\cdot\frac{7}{9}=\frac{4}{5}\).
Ответ: \(\frac{4}{5}\).
2) \(17.6:2.2=8\).
Ответ: 8.