.已知函数f(x)=x|x|,x∈R,若f(x0)=4,则x0的值为 ( ) A.-2    

已知函数f(x)x|x|xR,若f(x0)4,则x0的值为  (  )

A.-2                                        B2

C.-22                                    D.

答案

B.

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