17) $$\frac{y^2}{5} \cdot \frac{2}{y} =$$

$$\frac{y^2}{5} \cdot \frac{2}{y} = \frac{y^2 \cdot 2}{5 \cdot y} = \frac{2y^2}{5y} = \frac{2 \cdot y \cdot y}{5 \cdot y} = \frac{2y}{5}$$

Ответ: $$\frac{2y}{5}$$