1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)

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1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y

1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)
1、y-x/x²-y²
2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)

1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)
1 1/x+y
2 -1