6) (1/5 + 8/15) · 6

Сначала сложим дроби в скобках: \(\left(\frac{1}{5}+\frac{8}{15}\right)\cdot6=\left(\frac{3}{15}+\frac{8}{15}\right)\cdot6=\frac{11}{15}\cdot6=\frac{66}{15}=\frac{22}{5}\).

Ответ: \(\frac{22}{5}=4\frac{2}{5}\).