已知数列
为等比数列,数列
为等差数列,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9bd3f05d0b3341b5ffd7d9acb7ea61.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc9b87a80a62b2d19281e0e66994528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb4d1349bcdd0c8cc969b4108dd3f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9bd3f05d0b3341b5ffd7d9acb7ea61.png)
更新时间:2021-03-24 22:48:02
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