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.

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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.

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答案对任意的x0∈[0,1],因为exf(x)与e-f(x)在[0,1]上单调增加, [*] 令x→x0+,由夹逼定理得f(x0+Q)=f(x0),故f(x0-0)=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.

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