已知函数f(x)=x的3次方减3x的平方减9x加1,求函数f(x)的极值.
人气：178 ℃ 时间：2019-08-19 02:23:12
解答
f(x)的导函数为3x^2-6x-9; 3x^2-6x-9=0 (x-3)(x+1)=0 x=3时,f(x)取得极小值-26 x=-1时,f(x)取得极大值12
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