2.1. a) 10x. 24 16y 5x

$$ \frac{10x}{16y} \cdot \frac{24}{5x} = \frac{10x \cdot 24}{16y \cdot 5x} = \frac{240x}{80xy} = \frac{3}{y} $$

Ответ: $$\frac{3}{y}$$