x>y>z,试问1/(x-y)+1/(y-z)+1/(x-z)的符号.
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x>y>z,试问1/(x-y)+1/(y-z)+1/(x-z)的符号.
1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)
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