Question

(у/2х-2х/у):(у+2х) (/-дробь)

Answer 1

Решение на фотографии.

Answer 2

$( \frac{y}{2x} - \frac{2x}{y} ) \div (y + 2x) = \\ = \frac{ {y}^{2} - 4 {x}^{2} }{2x - y} \times \frac{1}{y + 2x} = \\ \\ = \frac{(y - 2x)(y + 2x)}{2xy} \times \frac{1}{y + 2x} = \\ = \frac{y - 2x}{2xy}$