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[级数] 级数的敛散

楼主: plowsavior (咕噜咕咕)   2014-02-20 21:53:22
找出所有x使下列级数收敛
1.∞ n n
Σ 2 (x+1)
n=1
2.
∞ 1 n
Σ (
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