1 . 已知数列
的前
项和为
,
(
),且
,
.
(1)求
的值,并证明
的等比数列;
(2)设
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/ddfaeef36fc613eb9f1086876da73b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0519af3f19dde038fab2e68b5e2a5387.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70c1a9d9b6c344f2395c5cc24ca350a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e5408daf8c4918e8baf4f4cfd0a4cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2017-02-08更新
|
2309次组卷
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5卷引用:北师大版(2019) 选修第二册 名师精选 专题一 数列 A卷
北师大版(2019) 选修第二册 名师精选 专题一 数列 A卷(已下线)卷11 数列章节测试 A卷 ·基础达标 -【重难点突破】2021-2022学年高二数学名校好题汇编同步测试卷(人教A版选择性必修第二册)人教B版(2019) 选修第三册 名师精选 第五章 数列 A卷2023版 苏教版(2019) 选修第一册 名师精选卷 第四章 数列2017届四川双流中学高三文必得分训练10数学试卷
2011·湖北·一模
2 . 已知数列
满足:
,已知存在常数
使数列
为等比数列.
(1)求常数
及
的通项公式;
(2)解方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de01e0ca0018abba2aec23cc20464a62.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3c61223aeb2841f2cef0e9168e42b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a296a9dc44a92a470f4026827a1a9d.png)
(1)求常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de01e0ca0018abba2aec23cc20464a62.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d456c6fa7282e4126b10a47ec0afb6de.png)
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