名校
1 . 已知各项均为正数的数列{
}满足
(
N*),且
是
的等差中项.
(I)求数列{
}的通项公式
;
(II)若
,求使
成立的正整数n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b11103bd6a443922b72a702024373c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b0aafc603ba02b6702e785b00a5013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d473bfcc52ebc119430335531488a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a826ead2adf4c861699c3db58d151c6.png)
(I)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43befc950bb08161ac8a3ce23e756c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60441404a57a2ad8001542d08c98c9b7.png)
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6卷引用:内蒙古赤峰二中2020-2021学年高二上学期第二次月考数学(理)试题
2 . 已知正项等比数列
的前
项和为
,且
,
与
的等差中项为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01332bd789b34743305c97eae15e95f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d51fbd012cde151c2b0f84e6b15e09aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5卷引用:内蒙古呼和浩特市第十六中学2020-2021学年高二上学期期中考试数学(文)试题
11-12高二上·福建福州·期中
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3 . 等差数列
不是常数列,
,且
是某一等比数列
的第1,2,3项.
(1)求数列{an}的第20项.
(2)求数列{bn}的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da32e6c01e47e8c84a7ff44ac125a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7abe2dbf91b745e81aa97bee35b0bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cebc64caecd6dd8440494c7e3216aa62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(1)求数列{an}的第20项.
(2)求数列{bn}的通项公式.
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2016-12-01更新
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4卷引用:内蒙古呼和浩特市第十六中学2020-2021学年高二上学期期中考试数学(文)试题
内蒙古呼和浩特市第十六中学2020-2021学年高二上学期期中考试数学(文)试题内蒙古呼和浩特市第十六中学2020-2021学年高二上学期期中考试数学(理)试题(已下线)2012届福建省福州八中高二上学期期中考试理科数学上海市复兴高级中学2023-2024学年高二上学期期中数学试题