1 . 已知数列
满足
,
.
(1)证明:数列
为等比数列.
(2)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164659e154e10c13694e2f4a36a3d3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f19112256c661c47057ae72962a3a2a.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd7fe32cbbf55c0ef0edbfb99b31a55.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d1de52d5b738dd058b8afb7e77f337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
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2022-01-16更新
|
2128次组卷
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6卷引用:贵州省黔西南州2021~2022学年高二上学期期中考试数学(理)试题
贵州省黔西南州2021~2022学年高二上学期期中考试数学(理)试题河南省南阳地区2021-2022学年高二上学期期中热身摸底考试数学试题河南省南阳市第一中学校2021-2022学年高三上学期第一次网上训练数学(文)试题(已下线)专题二十 数列求和(已下线)专题27 数列求和-3(已下线)第7讲 数列求和9种常见题型总结 (3)
解题方法
2 . 数列
中,
,
.
(1)证明:数列
是等比数列;
(2)设
,求数列
的前
项和
.
![](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/6702523bf2d7ec427db71949995b3158.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345edc602f5c52122b91e6864902fb8a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43440596ccdd19a9c033699b93db6bc.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)
您最近一年使用:0次
名校
3 . 已知数列
满足
,
.
(1)证明数列
是等比数列,并求数列
的通项公式;
(2)令
,求数列
的前
项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3998df04d0a8ded946c3f39d545fdc7e.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1413bc2c9162794f2dde9193684696e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd92c7e852847f4dcc8c5522932d638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2019-05-29更新
|
1145次组卷
|
8卷引用:【市级联考】贵州省遵义市2018-2019学年高一下学期期中考试数学试题
4 . 已知数列
中,
.
(1)求证:
是等比数列,并求
的通项公式
;
(2)数列
满足
,求
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225c9893c54af68ee7d52373b7eb41e8.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345edc602f5c52122b91e6864902fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add02169a8f58417880df4e302a7c498.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次