Question

 Разложить: a^2+b^2/a^2-b^2-a-b/a+b =

Answer 1

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