Question

Бусинки помогите пожалуйста

Answer 1

$\frac{5c-b}{(c-b)^{2} } -\frac{c+3b}{(c-b)^{2} }=\frac{5c-b-c-3b}{(c-b)^2} = \frac{4(c-b)}{(c-b)^2} =\frac{4}{c-b}$

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