Question

Помогите с д/з номер 860 а) в) д)

Answer 1

а) $\frac{a+b}{a^2-b^2} = \frac{a+b}{(a-b)(a+b)} = \frac{1}{a-b}$

в) $\frac{a^2-1}{ab-b} = \frac{(a-1)(a+1)}{b(a-1)} = \frac{a+1}{b}$

д) $\frac{x^2-y^2}{x^2+2xy+y^2} = \frac{(x-y)(x+y)}{(x+y)^2} = \frac{x-y}{x+y}$