已知数列
是等差数列,
为其前
项和.且
,
,若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcfb7ebf902cbc376a70a7c6d073407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/939239eca344c1a9d4b232a34a48ca1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55be3ab56ce541d1e6d8fbd92a7317f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.9 | B.10 | C.11 | D.12 |
更新时间:2021-11-17 18:38:13
|
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适中
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【推荐1】已知等差数列
中,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bea633fa5025f9232f5d5aa6daa8a2.png)
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A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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【推荐2】若一个等差数列的第二项为5,最后4项的和为48,且所有项的和为63,则这个数列有( )
A.5项 | B.6项 | C.7项 | D.8项 |
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【推荐1】已知数列
的前
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,若
,
,
.则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/be29d8f996c54183663d8a954166dc16.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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单选题
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名校
【推荐2】已知等差数列
的前n项和为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fcc825f2213bebc1b6bc0380da4035f.png)
A.数列![]() | B.![]() |
C.当![]() ![]() | D.![]() |
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