请问如何对数列x^n/(n*n!)求和(n趋于无穷大),如1 + x + x^2/(2!×2)+ x^3/(3!×3)...,
请问如何对数列x^n/(n*n!)求和(n趋于无穷大),如1 + x + x^2/(2!×2)+ x^3/(3!×3)...,
如题.都困扰很久了:(
Actually there is no elementary derivative.Have to use exponential integral Ei(x) to define the complex elements.Still thanks.
如题.都困扰很久了:(
Actually there is no elementary derivative.Have to use exponential integral Ei(x) to define the complex elements.Still thanks.
其他人气:790 ℃时间:2020-04-15 20:00:42
优质解答
逐项微分后求和再求积分
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