解题方法
1 . 已知
,
分别为数列
,
的前
项和,
且
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若对任意正整数
,都有
成立,求满足等式
的所有正整数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8e2134f83c92f194e787003e1796c.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(Ⅱ)若对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0761c1264764b38b42bab97817f92a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7871e32da1f00497475a9223a92e89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2021-08-23更新
|
1485次组卷
|
5卷引用:4.3 等比数列-2021-2022学年高二数学尖子生同步培优题典(苏教版2019选择性必修第一册)
(已下线)4.3 等比数列-2021-2022学年高二数学尖子生同步培优题典(苏教版2019选择性必修第一册)2020届安徽省淮北市高三下学期第二次模拟理科数学试题安徽省淮北市2020届高三二模理科数学试题(已下线)第02讲 等差数列-【帮课堂】2021-2022学年高二数学同步精品讲义(苏教版2019选择性必修第一册)(已下线)4.3.2 等比数列的通项公式(1)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)
名校
解题方法
2 . 设数列
的首项
,且
,
,
.
(1)证明:
是等比数列;
(2)若
,数列
中是否存在连续三项成等差数列?若存在,写出这三项,若不存在说明理由.
(3)若
是递增数列,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f258934739ab0989ebaa00025abcdfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6449976ac45703bf448dd960f0c315c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225194b4c3de347ddf755be14b4bce90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2889dd3096379db5dfdd51305bdbb743.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
2018-11-10更新
|
832次组卷
|
6卷引用:人教A版(2019) 选择性必修第二册 过关斩将 第四章 数列 专题强化练2 等比数列的综合运用