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解题方法
1 . 已知正项等比数列
中的
是函数
的极值点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ce78d6200f3eeb16a22a201193d6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67a7f00f43f916bd0ee9a111a2488f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f0a3e44f8659ef433ea7afc424b9e2.png)
A.![]() | B.1 | C.![]() | D.2 |
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2022-12-11更新
|
533次组卷
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3卷引用:黑龙江省鸡西市实验中学2024届高三上学期第三次月考数学试题
2 . 已知公差不为0的等差数列
的前n项和为
,
且
成等比数列.
(1)求数列
的通项公式;
(2)设
,求数列
前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769baad05736f6711bb8453ddc8ea624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1feadaa75e8458a03798feded6722513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba03562370a2f613e59a0876327c446.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f01c4db39e7b994e8de86398de5867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2448cf72af76b810310e4cfb9818e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
您最近一年使用:0次