解题方法
1 . 若数列
是等差数列且
,设其前
项和为
.若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af666955b1a031f8e13c5acfb3da83ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-03-13更新
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505次组卷
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2卷引用:湖北省鄂州市部分高中联考协作体2019-2020学年高二上学期期中考试数学试题