已知等差数列
满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7abe2dbf91b745e81aa97bee35b0bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a944cf5b9342ac78a5c51bd7f6fb120c.png)
A.5 | B.10 | C.20 | D.40 |
更新时间:2022-05-02 08:50:31
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【知识点】 等差中项的应用
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容易
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名校
解题方法
【推荐1】等差数列
的前
项和分别为
,且
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cc963c75730daa723bf5c00b2b4a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d93cc048366b6f82529b189d2427ddb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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