Question

Помогите пожалуйста!
$frac{5a^{2} +10ab +5b^{2} }{15a ^{2}-15b^{2} } = frac{a+b}{3(a-b)}$

Answer 1

$frac{5a^2+10ab+5b^2}{15a^2-15b^2}= frac{a+b}{3(a-b)}$
$frac{5(a^2+2ab+b^2)}{15(a^2-b^2)} = frac{a+b}{3(a-b)}$
$frac{(a+b)^2}{3(a+b)(a-b)} = frac{a+b}{3(a-b)}$
$frac{a+b}{3(a-b)} = frac{a+b}{3(a-b)}$
$a+b=a+b$
$a-a+b-b=0$
$0=0$