已知
是等差数列
的前n项和,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30eb42578f654fb61e826026d2199751.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4393929ec3f635c66ac321e7e368d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30eb42578f654fb61e826026d2199751.png)
2023·全国·模拟预测 查看更多[2]
更新时间:2023-11-20 15:49:14
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【知识点】 求等差数列前n项和
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【推荐2】已知等差数列
满足
,则该数列前14项的和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3adf2bf9a573b812ba2039e75368395.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee409bc00ae15708bf6083524bacf824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3adf2bf9a573b812ba2039e75368395.png)
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