Question

Xy дробная черта y²-x²- x дробная черта 2х-2y

Answer 1

$\frac{xy}{y^{2}-x^{2}}- \frac{x}{2x-2y}= \frac{xy}{(y-x)(y+x)}- \frac{x}{2(x-y)}=\frac{xy}{(y-x)(y+x)}+ \frac{x}{2(y-x)}= \\ = \frac{2xy+x(y+x)}{2(y-x)(y+x)}=\frac{3xy+x^{2}}{2(y-x)(y+x)}$