名校
1 . 已知各项均为正数的数列
的前
项和为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976350c923047d4ac547d42d66efd057.png)
,
.
(1)证明数列
为等差数列,并求
的通项公式;
(2)设
,数列
的前
项和记为
,证明:
.
![](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/976350c923047d4ac547d42d66efd057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed6b09d94b70d7d47602cfed41339c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429c1cc35267f0cffd1f0f036772759e.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24a790c41cca405e0e31ea0a7114d31.png)
您最近一年使用:0次
2019-12-16更新
|
383次组卷
|
3卷引用:重庆市合川实验中学2021届高三上学期期中数学(理)试题