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f(x)=x^3-x^2-x+1 f'(x)=3x^2-2x-1=(3x+1)(x-1) 當x<-1/3時單調增 當-1/3<x<1時單調减 在區間[-1,1]內,x=-1/3時有最大值 f(-1/3)=(-1/3)^3-(-1/3)^2-(-1/3)+1=32/27
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