9. Блок 1: 11/4 − 2/5; Блок 2: 9/5 · 2/3; Блок 3: (10/13 + 15/4) · 26/5. Вычислите.

Блок 1. \(\frac{11}{4}-\frac{2}{5}=\frac{55}{20}-\frac{8}{20}=\frac{47}{20}\).

Блок 2. \(\frac{9}{5}\cdot\frac{2}{3}=\frac{6}{5}\).

Блок 3. \(\left(\frac{10}{13}+\frac{15}{4}\right)\cdot\frac{26}{5}=\left(\frac{40}{52}+\frac{195}{52}\right)\cdot\frac{26}{5}=\frac{235}{52}\cdot\frac{26}{5}=\frac{47}{2}\).