函数f(x)=x3+ax2-3x-9,已知f(x)的两个极值点为x1,x2,则x1·x2=( ) A.9 

函数f(x)x3ax23x9,已知f(x)的两个极值点为x1,x2,x1·x2(  )

A.9         B.9          C.1           D.1

答案

D

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