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若函数f(x)=x3-3x-a在区间[0,3]上的最大值、最小值分别为M、N,则...

若函数f(x)=x3-3x-a在区间[0,3]上的最大值、最小值分别为M、N,则M-N的值为                                                                                                                (  )

A.2                                               B.4

C.18                                             D.20

 

D 【解析】略
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