230问答网 > 级数的敛散性，求具体步骤

级数的敛散性，求具体步骤

2025-04-03 20:58:24
推荐回答（2个）
回答1：

你好

第一个，

用莱布尼兹判别法
（莱布尼兹判别法）若交错级数Σ(-1)n-1u（nun>0 ）满足下述n=1 两个条件： （I） limn→∞ un=0；（II）数列{un}单调递减则该交错级数收敛。

因为第一个的绝对值函数单调递减，所以收敛

回答2：

第一个收敛 第二个发散

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