حاصل عبارت $\frac{{{x}^{۲}}-{{y}^{۲}}}{xy-{{y}^{۲}}}-\frac{xy-{{y}^{۲}}}{{{y}^{۲}}}$ کدام است؟
$\frac{{{x}^{2}}-{{y}^{2}}}{xy-{{y}^{2}}}-\frac{xy-{{y}^{2}}}{{{y}^{2}}}=\frac{(x-y)(x+y)}{y(x-y)}-\frac{y(x-y)}{{{y}^{2}}}=\frac{x+y}{y}-\frac{x-y}{y}=\frac{x+y-(x-y)}{y}=\frac{x+y-x+y}{y}=\frac{2y}{y}=2$