名校
1 . 已知数列
的前n项之和
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa32da22dc11658e01ffbea7322ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9909fd31747655ed87b5e0a6a582b0c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.61 | B.65 | C.67 | D.68 |
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2018-12-17更新
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1845次组卷
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6卷引用:【市级联考】湖北省部分重点中学2019届高三第一次联考数学(文)试题