解题方法
1 . 已知数列
中,
,
,当数列
的前
项和取得最大值时,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ea518c5f92e0cb508f33494d3a5671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9341800e8673e94a44577f816109029f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99792b5a0f044a8d23b10eac63d5f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.53 | B.49 | C.49或53 | D.49或51 |
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2022-03-02更新
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757次组卷
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2卷引用:山西省吕梁市2022届高三下学期开年摸底联考(全国卷1)数学(理)试题