下列函数中,既是偶函数又在(0,+∞)单调递增的函数是( ) A.y=x3

下列函数中,既是偶函数又在(0,+)单调递增的函数是(  )

Ayx3                                                       By|x|1

Cy=-x21                                              Dy2|x|

答案

 B

[解析] 本题考查函数的奇偶性以及单调性.

对于Ayx3不是偶函数,A错误;B正确,既是偶函数又在(0,+)上单增;对于C,在(0,+)上单调递减,错误;对于D,在(0,+)上单调递减,错误,故选B.

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