Question

ПОМОГИТЕ СРОЧНО!!!!!!!
НОМЕР 20.

Answer 1

$frac{5}{a} = frac{10}{2a} = frac{25}{a^2} = frac{5c}{ac} = frac{5(a+b)}{a(a+b)}$

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

Answer 2

спасииибоо

Answer 3

большое♥