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