解题方法
1 . 如图所示的是求数列{an}的第n项an的程序框图.
(1)根据程序框图写出数列{an}的递推公式;
(2)证明数列{ an }为等比数列,并求出数列{an}的通项公式;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/d630b34e-5544-45a1-a783-c980d6106a29.png?resizew=75)
(1)根据程序框图写出数列{an}的递推公式;
(2)证明数列{ an }为等比数列,并求出数列{an}的通项公式;
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解题方法
2 . 在数列
中,若
,
,则其通项公式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34673cc7c61773863d74badc2e4f1af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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2023-02-22更新
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719次组卷
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2卷引用:海南省2022-2023学年高二下学期学业水平诊断(一)数学试题
3 . 已知数列
和
满足
,
,若数列
满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85444874c705666de9488286d3d61dd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffadb004381f7bf07ad32bf4783331fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fab3af5f17a571a697ff0770fd8df2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0d442d0d26bbe40bef88dd206486c7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知
是公差
的等差数列,其中
,
,
成等比数列,13是
和
的等差中项;数列
是公比q为正数的等比数列,且
,
.
(1)求数列
和
的通项公式;
(2)令
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e11a5b70e1e2e685d1783a4707872e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04fcf0a152b19d49cac680b6199c320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfcba31b4b02ba57ca40c91f6c09f0e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d44ddab6e0c60119be69985ae7fa65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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5 . 龙曲线是由一条单位线段开始,按下面的规则画成的图形:将前一代的每一条折线段都作为这一代的等腰直角三角形的斜边,依次画出所有直角三角形的两段,使得所画的相邻两线段永远垂直(即所画的直角三角形在前一代曲线的左右两边交替出现).例如第一代龙曲线(图1)是以
为斜边画出等腰直角三角形的直角边
、
所得的折线图,图2、图3依次为第二代、第三代龙曲线(虚线即为前一代龙曲线).
、
、
为第一代龙曲线的顶点,设第
代龙曲线的顶点数为
,由图可知
,
,
,则
___________ ;数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4841a7238ffb7413e715d0dfde3c15f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7469dfbc8ceaec60ecf05a696e5ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4266c478e7b7c642a10d37c24896a703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f92fbacd0a1a4a2f3f5094ece399e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a8eef8182b33a4f2514f87296d4a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899349213429760/2902165343936512/STEM/308c0d3c-6468-458e-bd4e-e1316e61bbf6.png?resizew=682)
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2022-01-25更新
|
1287次组卷
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6卷引用:江苏省南京市金陵中学2022届高三学业水平选择性模拟考前最后一卷数学试题
解题方法
6 . 已知数列
是正项等比数列,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0496f142d8ae5acb06e83526eaa3ef87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8e8f821111de8075e5c3dfb22a5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
A.32 | B.24 | C.6 | D.8 |
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2021-08-07更新
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448次组卷
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3卷引用:2022年1月浙江省普通高中学业水平考试数学仿真模拟试卷B
(已下线)2022年1月浙江省普通高中学业水平考试数学仿真模拟试卷B浙江省温州新力量联盟2020-2021学年高二下学期期末联考数学试题第四章数列单元检测卷(B卷综合篇)-2021-2022学年高二数学同步单元AB卷 (人教A版2019选择性必修第一册+第二册,浙江专用)
名校
解题方法
7 . 已知数列{an}满足a1=1,an+1=2an,则a4=( )
A.4 | B.8 | C.16 | D.32 |
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2020-10-31更新
|
1791次组卷
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3卷引用:2020年湖南省普通高中学业水平考试数学试题
解题方法
8 . 已知数列
为递增等比数列,且
.
(1)求数列
的通项公式;
(2)若
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/156f96b19b4a4fa97b68502e24001da7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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9 . 已知数列
满足
.若
,则正整数m的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/529ca34dade6a4e9cef42c3bf2fc246e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923478af5d660afcc08e0ff5d4048b6e.png)
A.7 | B.8 | C.9 | D.10 |
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2020-12-11更新
|
275次组卷
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2卷引用:河北省2019年5月普通高中学业水平考试数学试题
解题方法
10 . 数列
满足
,若
,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a79b11c6a81e52c9245ac74a800375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0001a5d4a96049e247b7bd49a5986e65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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