搜搜考试网设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](/uploads/image/z/17390380-4-0.jpg?t=%E8%AE%BEf%27%28x%29%E5%9C%A8%5Ba%2Cb%5D%E4%B8%8A%E8%BF%9E%E7%BB%AD%2C%E5%9C%A8%EF%BC%88a%2Cb%29%E5%86%85%E4%BA%8C%E9%98%B6%E5%8F%AF%E5%AF%BC%2C%E4%B8%94f%28a%29%3Df%28b%29%3D0%2Cf%28c%29%3E0%2Ca)
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