已知数列
的前
项和为
,且
,
.
(1)证明:数列
是等比数列;
(2)求数列
的通项公式与前
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/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b716c0c70929dfe32eb59052b37999fc.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
(2)求数列
![](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)
2020高三·全国·专题练习 查看更多[4]
(已下线)考点33 数列求和(考点专练)-备战2021年新高考数学一轮复习考点微专题四川省雅安市雅安中学2020-2021学年高一下学期期中数学试题重庆市四川外语学院重庆第二外国语学校2022届高三上学期11月月考数学试题内蒙古赤峰市元宝山区第一中学2021-2022学年高一下学期期中考试数学试题
更新时间:2020-10-03 12:01:42
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解题方法
【推荐1】已知函数
是偶函数,
是奇函数,数列
满足
,且
,
.
(1)求
的通项公式;
(2)求
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3f103ec6f1fe6f651f02966687f958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e967e3f2cb4b8cc9588fb56ddb22febe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6f69bdfdb795ec44ef22f75bdf4fc6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
【推荐2】已知数列
满足
,且
.
(1)令
,求数列
的通项公式;
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e728c2a5646fa8710c2dbc7bce6514b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f15db2a737b9f42979eb0241fe19a2.png)
(1)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d44ddab6e0c60119be69985ae7fa65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
【推荐1】已知数列{
}是首项为
,公比
的等比数列.
设
,数列{
}满足
.
(Ⅰ)求数列{
}的通项公式;
(Ⅱ)求数列{
}的前
项和
;
(Ⅲ)若
对一切正整数
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2438f2272d7b7ab51dbbe587025a553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6821eb83c0e78f23cbf124d364ced75.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ce6f4aaca3e06faf4e881b7ea1fa9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
(Ⅰ)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(Ⅱ)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889e7cee86b3581e99d877711f49c3b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
【推荐2】已知正项等差数列
的前n项和为
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c48dadd03cb4b2d2b0ccc1038b1dcf.png)
(1)求
;
(2)若
,求数列
的前n项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80eaca12861cbae456753d3fa07fcb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c48dadd03cb4b2d2b0ccc1038b1dcf.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4eb949c52e6f560ea03ab5d27779430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68eee81e090b96819b7df54fc1bcc3a6.png)
您最近一年使用:0次