g(x)≠0,令F(x)=f(x)/g(x),则F`(x)={f`(x)g(x)-f(x)g`(x)}/g^2(x)
因为f(a)=f(b)=0,所以F(a)=F(b)=0,有罗尔定理可证
设f(x),g(x)在[a,b]上连续,在(a,b)内可导,且f(a)=f(b)=0,g(x)
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