Question

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

Answer 1

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