名校
1 . 设
为等差数列{
}的前n项的和,若
,
,则
=( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fefbae840ade8ca814c0e310b06eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ab7775d51085ed15b14e35b517b0af.png)
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A.-27 | B.-9 | C.9 | D.27 |
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2022-05-15更新
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388次组卷
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2卷引用:新疆维吾尔自治区塔城市塔城地区第一高级中学2023-2024学年高二下学期5月期中考试数学试题