Пожалуйста срочно !!!!!!!! Помогите очень срочно

1) $\frac{ x^{2} }{x+xy} = \frac{ x^{2} }{x(1+y)}= \frac{x}{1+y}$
2) $\frac{2a-2b}{ a^{2} - b^{2} } = \frac{2(a-b)}{(a+b)(a-b)} = \frac{2}{a+b}$
3) $\frac{a}{b-1} - \frac{a}{b} = \frac{ab-a(b-1)}{b(b-1)}= \frac{ab-ab+a}{b(b-1)} = \frac{a}{b(b-1)}$
4) $\frac{ a^{2} + b^{2} }{ a^{2} - b^{2} } - \frac{a-b}{a+b} = \frac{a^{2} + b^{2}}{(a-b)(a+b)} -\frac{a-b}{a+b} = \\ = \frac{a^{2} + b^{2}-(a-b)(a-b)}{(a-b)(a+b)} = \frac{a^{2} + b^{2}- a^{2} +2ab- b^{2} }{(a-b)(a+b)} = \\ = \frac{2ab}{(a-b)(a+b)}$
5) $\frac{ax+ x^{2} }{ a^{2} } * \frac{a}{a+x} = \frac{x(a+x)a}{ a^{2}(a+x) } = \frac{x}{a}$
6) $2ac* \frac{3c}{4 a^{2} } = \frac{6a c^{2} }{4 a^{2} }= \frac{ 3c^{2} }{2a}$
7) $\frac{ y^{2} }{ y^{2} -1} : \frac{y}{y+1} = \frac{y^{2}(y+1)}{(y^{2} -1)y}= \frac{y(y+1)}{(y-1)(y+1)} = \frac{y}{y-1}$
8) y=-6/x