Пожалуйста помогите!! Нужно упростить
1)x/(x-y)²-y/(x-y)(x+y)=[x(x+y)-y(x-y)]/(x-y)²(x+y)= =(x²+xy-xy+y²)/(x-y)²(x+y)=(x²+y²)/(x-y)²(x+y) 2)(x³-xy²)/(x²+y²) *(x²+y²)/(x-y)²(x+y)=x(x-y)(x+y)/(x-y)²(x+y)=x/(x-y) 3)y/(x-y)-x/(x-y)=(y-x)/(x-y)=-1