名校
解题方法
1 . 当
,且
时,我们把
叫做数列
的子数列.已知
为正项等比数列,且其公比为
.
(1)直接给出
与
的大小关系.
(2)是否存在这样的
满足:
成等比数列,且子数列
也成等比数列?若存在,请写出一组
的值;否则,请说明理由.
(3)若
,证明:当
,
时,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc9e15cba1e06e8ecd151d233ecc4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ff2500b5484b40bb2ccec65979cba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f070544508ef8ab537b19ef069d5fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e15be6eb86b5f1746b0036a87c9ca7.png)
(1)直接给出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddcc815a87e95af8100f0c2c7422d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)是否存在这样的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94299c635e889a3915aeb2b785419ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94299c635e889a3915aeb2b785419ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cee6526c7e1d9a04854271e135c9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94299c635e889a3915aeb2b785419ce.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbc131b15e1df6cf64e65eb88e23042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699e55c211a6e091cc7a9d2cde3ed981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898062ebfccd4fca082aa8a9d79a094b.png)
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名校
2 . 已知正项等差数列
中,
,其中
,6,
构成等比数列,
,数列
的前
项和为
,若
,不等式
恒成立,则实数
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d93c1ae7b22099a5d4c1c4241e5ca18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/0f8365233f341451598eb50525a1557a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d30793e17f7b00abfa51ef3b213ddbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2024-01-06更新
|
486次组卷
|
5卷引用:河南省商丘市第一高级中学2023-2024学年高二上学期1月份半月考数学试卷
河南省商丘市第一高级中学2023-2024学年高二上学期1月份半月考数学试卷湘豫名校联考2023-2024学年高二上学期1月阶段性考试数学试题广东省珠海市第一中学2024届高三上学期大湾区期末预测数学试题(二)(已下线)考点6 等比数列的前n项和的性质 2024届高考数学考点总动员【练】山东省菏泽市定陶区第一中学2023-2024学年高二上学期期末模拟数学试题
3 . 1640年法国数学家费马提出了猜想:
是质数,我们称
为“费马数”.设
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9d89502f50b4d8d3f2f66786bc5e01.png)
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47248a38e84a4e3b2f76c40b5cf1d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9da2b0e7b9eca965043be2f38a91f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee1af24b46162924648af2f8b4ca8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9d89502f50b4d8d3f2f66786bc5e01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000a24d1cf81b08493232a3ddcb8fd39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
A.7 | B.8 | C.9 | D.10 |
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2024-01-06更新
|
421次组卷
|
3卷引用:河南省商丘市第一高级中学2023-2024学年高二上学期1月份半月考数学试卷
名校
解题方法
4 . 在等比数列
中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a5e8551dd271cd60aff99f133ffd63.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f62010f64f60bc614b2066afe25d64f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a5e8551dd271cd60aff99f133ffd63.png)
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5 . 已知数列
中,
,且
.
(1)证明:
是等比数列;
(2)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5721409a50a2564ff3b0d8a9b6a0036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ca92bcbcdeecc0b1d07294185f9228.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbf9f185db0b253efbdbe95a6e29acd.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2023-03-23更新
|
477次组卷
|
2卷引用:河南省商丘市等2地临颍县第一高级中学等2校2022-2023学年高三下学期3月月考理科数学试题
解题方法
6 . 已知数列
的前
项和为
,且
.
(1)求
的通项公式;
(2)若
时,
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/312fddeb97c72b0aa3a0408dfdc2f067.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3023673cdfe90f999e2a7154414cadb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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7 . 某生物病毒繁殖规则如图,现有一个这种生物病毒,初始状态为
(
表示时间,单位:小时),由此推测
小时后此病毒的个数为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952520397086720/2958865191796736/STEM/1f30a588-8f7b-4dd6-a6ad-2c66708e9e51.png?resizew=298)
您最近一年使用:0次
8 . 设等比数列
的前
项和为
,若
,则下列式子中数值为常数的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/3a6a83fadb81bbf06e60890dd758e630.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-12-25更新
|
632次组卷
|
6卷引用:河南省商丘市第一高级中学2022-2023学年高二上学期期末数学试题
9 . 已知等差数列
和等比数列
满足
.
(1)求
的通项公式;
(2)求
的前n项和
.
![](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/43418ab8210b51c20ece7cefe1c4e5ba.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2021-12-12更新
|
641次组卷
|
2卷引用:河南省商丘市部分学校大联考2021-2022学年高二上学期阶段性测试(二)文科数学试题
10 . 已知正项数列
满足
,
.
(1)若
,数列
的前
项和为
,证明:
;
(2)设
,
.
(i)求数列
的通项公式;
(ii)设数列
的前
项积为
,若
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366dfedff1a1a96ec27650375b680059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0687b8005eac6baae31fb295e8e1f08a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bab9fff29a9164936453c19a97175ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/d9a1d6eb37f0459dbe8958e35d379f2f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e05bb18a9b15e5a8b9dddb396f5645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1ba4f4c461e42cf7d9ac35a6485a96.png)
(i)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(ii)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e697d45e6662202d1822a73ee78c887a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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