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判断级数∑1/[(n+1)(2n+3)]的敛散性
人气:203 ℃ 时间:2020-09-10 09:13:25
解答
1/((n+1)(2n+3))<1/(n(n+1))=1/n-1/(n+1)
∑1/((n+1)(2n+3))<∑[1/n-1/(n+1)]<=1
级数收敛
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