已知xy≠0且根号4x^2y^2=-2xy,则有()A.xy0 C.x>0,y>0 D.x
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已知xy≠0且根号4x^2y^2=-2xy,则有()A.xy0C.x>0,y>0D.x已知xy≠0且根号4x^2y^2=-2xy,则有()A.xy0C.x>0,y>0D.x已知xy≠0且根号4x^2y
已知xy≠0且根号4x^2y^2=-2xy,则有()A.xy0 C.x>0,y>0 D.x
已知xy≠0且根号4x^2y^2=-2xy,则有()
A.xy0 C.x>0,y>0 D.x
已知xy≠0且根号4x^2y^2=-2xy,则有()A.xy0 C.x>0,y>0 D.x
√4x²y²=√(2xy)²=|2xy|=-2xy
所以xy
A.xy<0
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