Andy » Вт ноя 13, 2018 10:21 pm
[tex]\frac{\frac{x}{y^2}-\frac{1}{x}}{\frac{1}{y}+\frac{1}{x}}=\frac{\frac{x^2-y^2}{xy^2}}{\frac{x+y}{xy}}=\frac{x^2-y^2}{xy^2} \cdot \frac{xy}{x+y}=\frac{x-y}{y}.[/tex]
[tex]\frac{\frac{x}{y^2}-\frac{1}{x}}{\frac{1}{y}+\frac{1}{x}}=\frac{\frac{x^2-y^2}{xy^2}}{\frac{x+y}{xy}}=\frac{x^2-y^2}{xy^2} \cdot \frac{xy}{x+y}=\frac{x-y}{y}.[/tex]