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f'(x)=1/3*3x²;-21*2x=x²;-42x令f'(x)=0得x²;-42x=0∴x=0或x=42f(0)=1,f(42)=-12347f(-1)=1/3(-1)³;-21(-1)²;+1=-1/3-21+1=-62/3f(4)=1/3*4³;-21*4²;+1=-941/3∴最大值是1,最…
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