设f(x)在[a,b]上连续,f(a)=f(b)=0,定积分f^2(x)从b到a等于1,则定积分xf(x)f'(x)等于多少A.1/2 B.1 C.0 D.-1/2

设f(x)在[a,b]上连续,且a 设函数f(x)在[a,b]上连续,a 设f(x)在[a,b]上连续,且a 设f(x)在[a,b]上连续,且a 设f(x)在[a,b]上连续,a 设函数f(x)在[a,b]上连续,a 设函数f 在[a,b]上连续,M=max|f(x)|(a 设函数f(x)在[a,b]上连续,在(a,b)内可导且f'(x) 设函数f(x)在[a,b]上连续,在(a,b)上可导且f'(x) 设函数f(x),g(x)在区间[a,b]上连续,且f(a) 设函数f(x)在[a,b]上连续,在(a,b)内有二阶导数,且有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 证明设f(x)在有限开区间(a,b)内连续,且f(a+) ,f(b-)存在,则f(x)在(a,b)上一致连续. 【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] 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] 设函数f(x)在[a,b]上连续,在(a,b)可导,且f(a)*f(b)>0,f(a)*f((a+b)/2) 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)