设f'(x)在[a,b]上连续,在（a,b)内二阶可导,且f(a)=f(b)=0,f(c)>0,a
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设f''(x)在[a,b]上连续,在（a,b)内二阶可导,且f(a)=f(b)=0,f(c)>0,a设f''(x)在[a,b]上连续,在（a,b)内二阶可导,且f(a)=f(b)=0,f(c)>0,a设f
设f'(x)在[a,b]上连续,在（a,b)内二阶可导,且f(a)=f(b)=0,f(c)>0,a
设f'(x)在[a,b]上连续,在（a,b)内二阶可导,且f(a)=f(b)=0,f(c)>0,a
设f'(x)在[a,b]上连续,在（a,b)内二阶可导,且f(a)=f(b)=0,f(c)>0,a
∵f(a)=f(b)=0 f(c)>0,且a
∵f'(x)在[a,b]上连续
∴至少存在一点m属于（a,b)使得f '' (m) <0
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【50分高数微积分题】设f(x)在[a,b]上连续,在（a,b）内可导 f(a)f(b)>0 f(a)f[(a+b)/2]