在下列区间中使y=x2不存在反函数的区间是(    ) A.(-∞,+∞)  

在下列区间中使y=x2不存在反函数的区间是(    )

A.(-∞,+∞)                              B.(-∞,0].

C.(0,+∞)                              D.[2,6]

答案

解析:y=x2在其某个单调区间上才存在反函数.故选A.

答案:A.

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