已知数列
是等差数列,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd7db658e20f1a1495058f2a3b87a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
更新时间:2023-12-13 12:39:03
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【推荐1】已知4,
,
,25成等差数列,4,
,
,25成等比数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d8d01d3be7350d45864ee621d505f8.png)
______ .
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【推荐2】设数列
,
都是等差数列,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a2e81424aaa101411f91f641a20018.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
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【推荐2】等差数列
的前n项和为
,若
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______ ,
的值是________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f907d998b6ca7466948ab5a7ff76c.png)
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