Merge remote-tracking branch 'origin/develop' into develop

3 months ago · 31dcbf764b
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--- a/编写小组/课后测/课后测解析版4.md
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  - 编写小组
 ---
 1.判断数列 $a_n = \frac{(-1)^n n}{n+1}$ 的收敛性。
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 **解析**  
 - 偶数项子列：$a_{2k} = \frac{2k}{2k+1} \to 1$
 - 奇数项子列：$a_{2k-1} = -\frac{2k-1}{2k} \to -1$