已知等差数列
的公差为
,前
项和为
,且
,
则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/c0b0f60ed9597e67a7a4c9e9af826c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e425bc1cd8f3550638b4040326960b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
A.1 | B.![]() | C.![]() | D.-1 |
更新时间:2024-06-08 14:35:56
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【推荐1】已知数列
的所有项均为正数,其前
项和为
,且
.则
的通项公式为( )
![](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/9450a72273297d201a197c8572742de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】已知数列
满足
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dccc60738f39c78238b0670e4f319b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5eb9b8f893dd71876349ad40724550.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知
为等差数列,
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022b5715b3831df7f82f458ffb0585d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f689684622a10317b3fa17ae95cbc039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
A.250 | B.410 | C.50 | D.62 |
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【推荐2】已知各项不为0的等差数列
满足
,数列
是等比数列,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e406f0809f58ced8653d327db0c7c8ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9c77ce4d6b6f7c75a8b84b5c3c6c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79de1369b82374587031ea4e8cf6ab45.png)
A.1 | B.8 | C.4 | D.2 |
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【推荐1】南宋数学家杨辉所著的《详解九章算法》中有如下俯视图所示的几何体,后人称之为“三角垛”.其最上层有1个球,第二层有3个球,第三层有6个球,…,则第十层球的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/05361ab2-1aa7-47a9-8dc9-6a984565c104.png?resizew=136)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/05361ab2-1aa7-47a9-8dc9-6a984565c104.png?resizew=136)
A.45 | B.55 | C.90 | D.110 |
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【推荐2】观察下列等式:13=12,13+23=32,13+23+33=62,13+23+33+43=102.根据规律,可以得到
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140303f0cec1767b9ab2c135b9379eb6.png)
A.1205 | B.1225 | C.1245 | D.1275 |
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【推荐1】记
为等差数列
的前n项和,有下列四个等式,甲:
;乙:
;丙:
;丁:
.如果只有一个等式不成立,则该等式为( )
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5170584604571b5e1afd5ece941e2e73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa54a479e4178d698818f69d859fe13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3859890e300f470dcf4a215249da07e.png)
A.甲 | B.乙 | C.丙 | D.丁 |
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【推荐2】已知数列
是各项为正数的等比数列,点
、
都在直线
上,则数列
的前
项和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e3c3c88acb2c67b916a610c37969d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22090737764b1a5aa651f4e6216fc43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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