设f(x)在[a,b]上连续,在(a,b)内可导,且f(a)f(b)>0,f(a)[(a+b)/2]
问题描述:
设f(x)在[a,b]上连续,在(a,b)内可导,且f(a)f(b)>0,f(a)[(a+b)/2]
f(a)f[(a+b)/2]
答
在[a,b]上设g(x)=f(x)e^(-kx),g(x)在[a,b]上连续,在(a,b)内可导,且g(a)g(b)>0,g(a)[g(a+b)/2]0 (g(a)