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deta=0ʱµÄÒªÇóתΪ
1£©f''>0ÇÒf'(0)=0,(¼´f'(x)<0,µ±x<0;f'(x)>0,µ±x>0)
deta~=0תΪҪÇó
2£©f'(0.25)=12.875,f'(0.75)=-f(0.25)
3£©f''(0.25)>-51.5,f''(0.75)>-51.5
4£©f(0.25)=f(0.75)

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