在等比数列
中,已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055a4ea5a85aaf6bb0fd4d1009bcda33.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d9b6c86435e0ceff94d8ad1cd03737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055a4ea5a85aaf6bb0fd4d1009bcda33.png)
2019·河北·模拟预测 查看更多[2]
更新时间:2019-03-22 20:44:36
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【知识点】 等比数列通项公式的基本量计算
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较易
(0.85)
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【推荐1】各项均为正数的等比数列
的前n项和为
,
,
,则使
成立的n的最小值为_____________ .
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7289afb8de62d067852999590b00c8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdd370a4e3119af988049bfc55a6ef6.png)
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填空题-单空题
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较易
(0.85)
【推荐2】公比为
的等比数列
的各项都是正数,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8671030c3ba1f8033abc7726c0c5c0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
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