Решите пример. 2.47 а)

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

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

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

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