已知各项均为正数的等比数列
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06ef951f417999eb27a611d385c1a31.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b3ef347c4dd0123db2a555bd761084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6146bd6dedfa7ed55f4a90d797c39ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06ef951f417999eb27a611d385c1a31.png)
2020高三下·全国·专题练习 查看更多[1]
(已下线)理科数学-6月大数据精选模拟卷06(新课标Ⅲ卷)(满分冲刺篇)
更新时间:2020-06-19 21:32:34
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【知识点】 等比数列下标和性质及应用
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【推荐1】在各项均为正数的等比数列
中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20147d7a6ed0ded3c5c139a2ad9a0c1a.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e1e66c8d9caffb869ec78a43bf6bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20147d7a6ed0ded3c5c139a2ad9a0c1a.png)
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【推荐2】在等比数列{an}中,有a3a11=4a7,数列{bn}是等差数列,且b7=a7,则b5+b9=________ .
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