级数∑(n+1)^2/n!=s=

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级数∑(n+1)^2/n!=s=级数∑(n+1)^2/n!=s=级数∑(n+1)^2/n!=s=s=∑(n+1)^2/n!=∑(n²+2n+1)/n!=∑n²/n!+2∑n/n!+

级数∑(n+1)^2/n!=s=
级数∑(n+1)^2/n!=s=

级数∑(n+1)^2/n!=s=
s=∑(n+1)^2/n!=∑(n²+2n+1)/n!
=∑n²/n!+2∑n/n!+∑1/n!
=∑n/(n-1)!+2∑1/(n-1)!+∑1/n!
=∑(n-1+1)/(n-1)!+2∑1/(n-1)!+∑1/n!
=∑1/(n-2)!+3∑1/(n-1)!+∑1/n!
=e+3e+e
=5e

此级数根本就不收敛吧