4. Вычислите: \(\left(\frac{17}{35}+\frac{3}{8}\right):\frac{5}{28}\).

\(\frac{17}{35}+\frac{3}{8}=\frac{136}{280}+\frac{105}{280}=\frac{241}{280}\).

\(\frac{241}{280}:\frac{5}{28}=\frac{241}{280}\cdot\frac{28}{5}=\frac{241}{50}\).

Ответ: \(\frac{241}{50}\).