化简求值 (xy-x的平方）除以 x-y分之x的平方-2xy+y的平方 乘 x的平方分之x-y,其中x=2分之3,y=2分之1

(xy-x²)÷(x²-2xy+y²)/(x-y)×(x-y)/x²=-x(x-y)÷(x-y)²/x²=-x(x-y)×x²/(x-y)²=-x³/(x-y)∵x=3/2,y=1/2∴-x³/(x-y)=-(3/2)³/(3/2-1/2)=-(3/2)³=-27/8...