Question

Помогите, заранее благодарочка.

Answer 1

A) $\frac{3x}{2x-y} + \frac{-x-y}{2x-y} = \frac{3x-x-y}{2x-y}= \frac{2x-y}{2x-y} =1$
б) $\frac{ a^{2}+ b^{2} }{ a^{2}- b^{2} }- \frac{b}{a-b} - \frac{b}{a+b} = \frac{ a^{2}+ b^{2}-ab- b^{2} -ab+ b^{2} }{ a^{2}- b^{2} } = \frac{ a^{2}-2ab+ b^{2} }{ a^{2}- b^{2} } = \frac{(a-b) ^{2} }{ a^{2}- b^{2} }=$$\frac{(a-b)(a-b)}{(a-b)(a+b)} = \frac{a-b}{a+b}$