Aloha ImiPups ;)
Willkommen in der Mathelounge...
$$\phantom{=}\frac{x+2}{xy}-\frac{x+y}{x^2y}+\frac{x-y}{xy^2}$$$$=\frac{(x+2)\cdot xy}{xy\cdot xy}-\frac{(x+y)\cdot y}{x^2y\cdot y}+\frac{(x-y)\cdot x}{xy^2\cdot x}$$$$=\frac{x^2y+2xy}{x^2y^2}-\frac{xy+y^2}{x^2y^2}+\frac{x^2-xy}{x^2y^2}$$$$=\frac{(x^2y+2xy)-(xy+y^2)+(x^2-xy)}{x^2y^2}$$$$=\frac{x^2y+2xy-xy-y^2+x^2-xy}{x^2y^2}$$$$=\frac{x^2y-y^2+x^2}{x^2y^2}$$