23-24高二上·全国·课后作业
1 . 判断下列数列
的单调性:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a217989c85534ed601411d60fc80c5.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634d5bf6ee5e77430771ab26c6464fa5.png)
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23-24高二上·全国·课后作业
2 . 写出下列数列的前5项:
(1)
,
;
(2)
,
;
(3)
,
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44cb8f0db1b16bff4310b82e06006562.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef12bf256807698ffa9e78ccde978273.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c13071fd55a570eefcc86dc9249d1e.png)
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23-24高二上·全国·课后作业
3 . 2500多年前的古希腊毕达哥拉斯学派在研究数时,喜欢把数描述成沙滩上的小石子.他们发现1,3,6,10,15,…这些数量的石子,都可以排成三角形(如图),并称这样的数为“三角形数”,记图中小圆的个数依次构成数列
,试写出数列
的一个递推关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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23-24高二上·全国·课后作业
4 . 根据递推公式和初始条件
,出数列
的前5项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b83e5586bd9a6038f6f7667c81d7d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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23-24高二上·全国·课后作业
5 . 某种生物细胞在实验室的培养过程中,每小时分裂一次(一个分裂为两个),经过12h,由1个这种细胞可以繁殖成多少个细胞?
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23-24高二上·全国·课后作业
6 . 根据下列数列的前4项,写出它的一个通项公式:
(1)0,1,0,1,…;
(2)7,77,777,7777,…;
(3)
,
,
,
,…;
(4)
,
,
,
,….
(1)0,1,0,1,…;
(2)7,77,777,7777,…;
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d7abf02717d6e59d8a64a65a87c412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8930e9a26a52a6b09740c1dddbd40e.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd37d47f9a1ad00a5fafcd6ff6091204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd8f0a690ba1252cf8544277d82d051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188bc67239df669ba21f992293d65f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8d0b415f08d183c7b29a7e64ca5b10.png)
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23-24高二上·全国·课后作业
7 . 根据数列
的通项公式,写出它的前5项及第
项:
(1)
;
(2)
;
(3)
;
(4)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e79d4bd5a097f33c194e0dd2052d81.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/339670224102d561097906ee2af4e80a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba91bdaabc6349a6f7c6cd6f1d73516.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/873bdf76d4cef9d9e9478935d6d4b320.png)
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23-24高二上·全国·课后作业
8 . 观察下面各数列,试着找出它的一个通项公式:
(1)2,4,2,4,…;
(2)9,99,999,9999,…:
(3)
,
,
,
,….
(1)2,4,2,4,…;
(2)9,99,999,9999,…:
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357821e0e5595eaf3028df63d47b2c58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7e4900636034c67e37e73e9a29e2a7.png)
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9 . 若
,
,
,则a,b,c是等差数列还是等比数列?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0317d5211e6afbf1ae502088b3ce1cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba42836c4198b3b4315e0a892e0a8851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7a94549ca307e2797f0d33403b66c9.png)
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23-24高二上·全国·课后作业
解题方法
10 . 已知等差数列
的前四项之和为60,末四项之和为180,所有项的和为390,求此数列的项数n.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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