1 . 已知数列
满足
,
且
.
(1)求证:数列
是等比数列;
(2)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92243e08480338fbb6c2672978c919cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d307ec71820b6536453fbdb5069da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b985f0bedfcdb883b3bb2fa76c2486e3.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2 . 已知等比数列
的公比为2,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e83ea4f03c18f703c4b5f09f4b0c22.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 等比数列{an}中,首项
,公比
,记
为它的前n项之积,则
最大时,n的值为
![](https://img.xkw.com/dksih/QBM/2015/8/19/1572216692367360/1572216697634816/STEM/30fd78d3605b4eee8bf8ac081b80be65.png)
![](https://img.xkw.com/dksih/QBM/2015/8/19/1572216692367360/1572216697634816/STEM/4cfa46572cd04005b87317243c7d25cb.png)
![](https://img.xkw.com/dksih/QBM/2015/8/19/1572216692367360/1572216697634816/STEM/8f6ba32160374f4385ddfb53cc86c098.png)
![](https://img.xkw.com/dksih/QBM/2015/8/19/1572216692367360/1572216697634816/STEM/8f6ba32160374f4385ddfb53cc86c098.png)
A.9 | B.11 | C.12 | D.13 |
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12-13高三上·重庆·期末
4 . 已知正项等比数列
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b8165eef1195e71950674f18c1676b.png)
A.![]() | B.2 | C.4 | D.![]() |
您最近一年使用:0次
名校
5 . 在等比数列
中,
,则 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c47fc8df6f62a1c1fc2bde7e49ef042.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc6dec1784bf350c9f2214f42a2196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c47fc8df6f62a1c1fc2bde7e49ef042.png)
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2024-01-17更新
|
0次组卷
|
4卷引用:重庆市第八中学校2023-2024学年高二上学期期末考试数学试题
6 . 已知数列
满足
,则数列
的前8项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ad4e59d7081cf19021423a984bc29.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89efd62e2cc74b39517cc6df509fbbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ad4e59d7081cf19021423a984bc29.png)
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名校
解题方法
7 . 已知等差数列
的首项
,公差
.记
的前
项和为
.
(1)若
,求
;
(2)若对于每个
,存在实数
,使
成等比数列,求公差
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7bdaaf8b0adf10bf2ef6c1255b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54cd524cce52478dd22534fdc85e0b6.png)
![](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/fecef46c239aaf03966b0449969a5875.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f785fe9d1c51ad5b2a8de69c5441caf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若对于每个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae836861d88d1fac48077b5ee72318c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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8 . 在等比数列
中,若
,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504f08b49ec6020e15f81a811eb32b8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
A.![]() | B.4 | C.8 | D.64 |
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10-11高三·江西·阶段练习
9 . 设
是公比为
的等比数列,令
,若数列
的连续四项在集合
中,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b824ffd5efcbc851f8971691eb8af4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aaff8882e162fd32547fd20cf610709.png)
![](https://img.xkw.com/dksih/QBM/2014/12/29/1571939475161088/1571939480748032/STEM/feb0f58930dc4698b36f13f7ece8e049.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
10 . 已知数列
满足:
,若
.
(1)求证:数列
是等比数列;
(2)若数列
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e34fe59ee9258b2457671fd8d207d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a89e23cbb54c644241cd0231c09bbd.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若数列
![](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/3b9a0d7150fb24be3e28ef7f0e18be93.png)
您最近一年使用:0次
2017-03-06更新
|
573次组卷
|
2卷引用:2017届重庆市高三上学期第一次诊断模拟(期末)数学(理)试卷