已知数列
是递增的等比数列,且
,
,则
的值等于________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd750727d713336df09a4a26781d7e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc594a0bdc6de3e4233f501cbc509581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c2f981c2c9d55dbea8172ff5ccf0db.png)
更新时间:2018-06-01 17:07:41
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解题方法
【推荐1】等比数列
满足
,则该数列通项公式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18154ae272d5edfcdf9ba46b8aa3b2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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【推荐2】已知等差数列
的公差
,等比数列
的公比q为正整数,若
,
,且
是正整数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d38c4c234dd55eaf29979489df6f99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf1d34ca8761d543421612ac55511c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b6183d0a5fc6ab48a3167677cf99b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
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【推荐1】在正项等比数列{an}中,有a1a3+2a2a4+a3a5=16,则a2+a4=__ .
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