三水电信营业厅:求Sn=1/2!+2/3!+3/4!+…+n/(n+1)!=
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求Sn=1/2!+2/3!+3/4!+…+n/(n+1)!=?
求Sn=1/2!+2/3!+3/4!+…+n/(n+1)!=?
Sn=1-1/2!+1/2!-1/3!+1/3!-1/4!+…+1/(n-1)!-1/n!+1/n!-1/(n+1)!
=1-1/(n+1)!
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求Sn=1/2!+2/3!+3/4!+…+n/(n+1)!=