名校
1 . 记等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73cd0e0054d6bc724daa988674d5ce7.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b01110921ab2713eae226d4f61205eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73cd0e0054d6bc724daa988674d5ce7.png)
您最近一年使用:0次
2019-05-05更新
|
701次组卷
|
2卷引用:新疆石河子第一中学2018-2019学年高一下学期期末数学试题
名校
2 . 数列
中,
,
(
为常数).
(1)若
,
,
成等差数列,求
的值;
(2)是否存在
,使得
为等比数列?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca47098c1aa847a002fc5b77f5632db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc79ce6a387dfe20817e5658b0b5af0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d479842818cdc157624e4e89b708075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
2019-05-04更新
|
542次组卷
|
5卷引用:新疆石河子第一中学2018-2019学年高一下学期期末数学试题
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