2.47 а) решите пример

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

} " alt=" \frac{(x+y)(x-y)}{y(x-y)²} " align="absmiddle" class="latex-formula"> =
$\frac{y²-(x+y)(x-y)}{ y(x-y)(x-y)}$ =

}{ y(x-y)(x-y) } " alt=" \frac{y²-x²+y²}{ y(x-y)(x-y) } " align="absmiddle" class="latex-formula"> =

²}{ y(x-y)² } " alt=" \frac{2y²-x²}{ y(x-y)² } " align="absmiddle" class="latex-formula">