Помогите прошу.упростить

[latex] \frac{x^2}{x^2+2xy+ y^2} : ( \frac{x}{x+y} - \frac{xy}{y^2-x^2})= \frac{x^2}{(x+y)^2} : ( \frac{x}{x+y} - \frac{xy}{(y-x)(y+x)} )=\\= \frac{x^2}{(x+y)^2} : ( \frac{xy-x^2-xy}{(y-x)(y+x)})=- \frac{x^2*(y-x)(x+y)}{(x+y)^2*x^2} =- \frac{y-x}{x+y} = \frac{x-y}{x+y} [/latex]