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数学
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已知f(lnx)=ln(1+x)/x,求f(x) .
完整 求f(x)
人气：319 ℃ 时间：2020-06-02 03:19:57
解答
令 lnx=t,则 x=e^t
有 f(lnx) =f(t)= ln(1+e^t)/e^t
所以f(x)=ln(1+e^x)/e^x
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