1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)
问题描述:
1、y-x/x²-y²
2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)
答
1 1/x+y
2 -1