设f(x)在[0,1]上有定义,且exf(x)与e-f(x)在[0,1]上单调增加.证明:f(x)在[0,1]上连续.

admin2019-05-08  24

问题 设f(x)在[0,1]上有定义,且exf(x)与e-f(x)在[0,1]上单调增加.证明:f(x)在[0,1]上连续.

选项

答案对任意的x∈[0,1],因为ex(x)与e-f(x)在[0,1]上单调增加, [*] 令x→x0,由夹逼定理得f(x0+0)=f(x0),故f(x0一0)=f(x0+0)=f(x0), 即f(x)在x=x0处连续,由x0的任意性得f(x)在[0,1]上连续.

解析
转载请注明原文地址:https://kaotiyun.com/show/AsJ4777K
0

最新回复(0)