Question

Помогите пожалуйста
​

Answer 1

Объяснение:

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