化简求值 分式x²-4/xy-x+2y-2,其中x=-8,y=1/2

化简求值 分式
x²-4/xy-x+2y-2,其中x=-8,y=1/2

(x²-4)/(xy-x+2y-2)
=[(x+2)(x-2)]/[y(x+2)-(x+2)]
=[(x+2)(x-2)]/[(x+2)(y-1)]
=(x-2)/(y-1)
=(-8-2)/(1/2-2)
=(-10)/(-1/2)
=10/(1/2)
=10×2
=20
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