设等差数列
的前
项和为
,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/7152c677fbd6cdd03194014eb5d6c3bc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-04-11 19:54:09
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【推荐1】已知
为等差数列
的前n项和,且
,
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43280586a44997f92b5f8f629472749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d404961e549677edf02083705490b89.png)
A.![]() | B.![]() |
C.![]() ![]() ![]() | D.![]() ![]() |
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【推荐2】已知一组数据的平均数、中位数、众数依次成等差数列,若这组数据丢失了其中的一个,剩下的六个数据分别是2,2,4,2,5,10,则丢失的这个数据可能是( )
A.-11 | B.3 | C.9 | D.17 |
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名校
【推荐1】已知{an}为等差数列
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79669cc3d62244ff65c0b56ba8a9caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141d54afdf3360211f974be0f7fdec7c.png)
A.{an}的公差为-2 | B.{an}的通项公式为an=31![]() |
C.{an}的前n项和为![]() | D.{|an|}的前50项和为2565 |
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解题方法
【推荐2】已知
是等差数列,其前n项和为
,
是等比数列,且
,
,
,则下列结论正确的是( )
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5a7a17a394e868e0acd1803a9ab795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da00560d18f576a37bcc21459698145f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b224a65a8f2d495d327e4a488c0dba1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次