Question

Срочно!
4y. 2
----- - -------- =
y2-x2. y-x

Answer 1

$frac{4y}{y^2-x^2} - frac{2}{y-x}= frac{2}{(y-x)(y+x)} - frac{2(y+x)}{(y-x)(y+x)} =\ frac{2-2(y+x)}{(y-x)(y+x)} = frac{2(1-(y+x))}{(y-x)(y+x)}$