1 . 已知数列
为等差数列,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbbc08bca7e93773f195446620aa0e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c32e71e1803603989c788bd1e9bb95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbbc08bca7e93773f195446620aa0e5.png)
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2018-06-07更新
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7卷引用:【全国百强校】山东省济南外国语学校2019届高三12月月考数学(文)试题
A.![]() | B.![]() | C.![]() | D.![]() |