已知
,
,
成等比数列,其中
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e393a3e3fce2f3995cd3b5727633074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0af55d68d29416f97149f5066b6f090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
更新时间:2020-11-22 13:59:54
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【知识点】 等比中项的应用
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【推荐1】在数列
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填空题-单空题
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较易
(0.85)
名校
【推荐2】在等比数列
中,
,若
为等差数列,且
,则数列
的前5项和为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
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