5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/
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5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/x² 其中x=1/2,y=-2/3
原式
=5x(y-x)× xy/(x-y)^2*(x+y)(x-y)/x^2
=-5y(x+y)
=-5*(-2/3)(1/2-2/3)
=-5/9
=5x(y-x)× xy/(x-y)^2*(x+y)(x-y)/x^2
=-5y(x+y)
=-5*(-2/3)(1/2-2/3)
=-5/9
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x-y/x²÷x²-2xy+y²/xy*(xy-x²)
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