From 4d233e8111ee28bb1fc2e8a9424a204161e2be25 Mon Sep 17 00:00:00 2001
From: msg3fexvz <3286545699@qq.com>
Date: Tue, 23 Dec 2025 10:49:23 +0800
Subject: [PATCH] ADD file via upload

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+1.级数$\sum_{n=1}^{\infty}sin(\sqrt{n^2+1}\pi).$收敛
+A.正确
+B.错误
+
+
+2.级数 $\sum_{n=1}^{\infty} \left( \frac{\sin n}{n^2} + \frac{(-1)^n}{n} \right)$ 的收敛性是：
+
+A. 绝对收敛
+
+B. 条件收敛
+
+C. 发散
+
+D. 可能收敛可能发散
+
+
+3.级数$\displaystyle \sum_{n=1}^{\infty} \frac{3^n}{n^2}$  收敛
+A.正确
+B.错误
+
+
+
+
+
+
+
+
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+4,级数$\sum_{n=1}^{\infty} \frac{1}{5^n} \cdot \frac{3n^3 + 2n^2}{4n^3 + 1}$  收敛
+A.正确
+B.错误
+
+ 
+
+5.级数$\sum_{n=1}^{\infty} \frac{1}{n} \arctan \frac{n}{n+1}$  收敛
+A.正确
+B.错误
+
+ 
+