解题方法
1 . 已知数列
满足
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f95fdbbfce52f179960b5ce2e5b513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
A.2 | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 南宋数学家杨辉所著的(详解九章算法.商功)中出现了如图所示的形状,后人称之为“三角垛”.“三角垛”最上层有1个球,第二层有3个球,第三层有6个球,…..,设第
层有
个球,从上往下
层球的总数为
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/938d44ee-0186-4edf-bb39-7fc843439b4d.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/938d44ee-0186-4edf-bb39-7fc843439b4d.png?resizew=164)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3 . 已知
是公差不为0的等差数列,
,且
成等比数列,数列![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454ffe59d3fe8c2932dc239118941678.png)
,数列
的前
项和
.
(1)求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b1b845916a4b6a18cdfbcd308d09c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454ffe59d3fe8c2932dc239118941678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22a3371dc976b6b3d9cc29a70445b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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名校
4 . 在数列
中,已知
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ea47801d8340f3d0ccf3153cb8bcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-03-04更新
|
506次组卷
|
2卷引用:河北省邢台市2023-2024学年高二上学期1月期末数学试题
5 . 毕达哥拉斯学派是古希腊哲学家毕达哥拉斯组建的学派,他们长把沙滩上的沙粒或者小石子用数表示,并由它们排列而成的形状对自然数进行研究,如图,图形中的圆点数分别是1、5、12、22…,以此类推,第五个图形对应的圆点数为___________ .
您最近一年使用:0次
名校
解题方法
6 . 设等比数列
的前
项和为
,且
(
为常数),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/207122b4594b80a670136d5194f74ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-03-04更新
|
1153次组卷
|
4卷引用:河南省部分名校2024届高三上学期期末检测数学试题
解题方法
7 . 设数列
的前
项和为
,若
,且
.
(1)证明数列
是等差数列,并求
的表达式;
(2)求数列
的通项公式.
![](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/96b8398a14c855f51909764b5d0f5935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8050391385b496e9c059201e4f12600a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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8 . 已知正项数列
的前n项和为
.
(1)求数列
的前n项和
;
(2)令
,求数列
的前9项之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db745b3bef1c70a904c429bdd5befb53.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060040800c9dc3ad149fa6a412819361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cb59264646eae8a5d5fdf0f76e5461.png)
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2024-03-03更新
|
1148次组卷
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4卷引用:安徽省池州市2024届高三上学期期末数学试题
安徽省池州市2024届高三上学期期末数学试题(已下线)专题04数列求和的6种常考题型归类【好题汇编】-备战2023-2024学年高二数学下学期期末真题分类汇编(北师大版2019选择性必修第二册)河南省南阳市西峡县第一高级中学2023-2024学年高二下学期第一次调研测试数学试卷(已下线)模块五 专题5 全真拔高模拟5(北师大高二期中)
名校
解题方法
9 . 已知数列
满足
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5cad9aa4006c1d61d3634e24ce22a0.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2024-03-03更新
|
817次组卷
|
3卷引用:安徽省池州市2024届高三上学期期末数学试题
解题方法
10 . 在数列
中,
,且
,则
的通项公式为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c5d5ddcc1aa616d9173af4e290d88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次