1 . 如图的形状出现在南宋数学家杨辉所著的《详解九章算法·商功》中,后人称为“三角垛”.“三角垛”的最上层有1个球,第二层有3个球,第三层有6个球,第四层有10个球…….记第
层球的个数为
,则数列
的前20项和为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/6/cfd598c1-6212-4271-936c-1bba4ba9a2ee.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/4b01041691ad489f126f05c18ea8f0fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/6/cfd598c1-6212-4271-936c-1bba4ba9a2ee.png?resizew=164)
A.![]() | B.![]() | C.![]() | D.![]() |
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3卷引用:山东省滨州市2024届高三上学期期末数学试题
2024·全国·模拟预测
2 . 已知等比数列
的各项均为正数,其前
项和为
,若
,
,则
等于( )
![](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/ae5439f992cbbdef368a7a88a546ac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cbe28558ed5cb9f1dc65dafc964b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
A. ![]() | B.![]() | C.![]() | D.![]() |
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2024·全国·模拟预测
3 . 已知等差数列
,记
为
的前
项和,从下面①②③中再选取一个作为条件,解决下面问题.①
;②
;③
.
(1)求
的最小值;
(2)设
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bade4519ff92c23153359a948b3294b.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03458ea0122be9132b1a401b58c9a7b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4405d9d4bd3511eec6adc6772f06fc56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2378ded814fd1da5a01db651aab8cd9e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91adba8efbf964e9e35547b0fd0ea36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f710b0e6ccca316852bf3a94f68135.png)
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解题方法
4 . 已知数列
的前
项和为
,若
,则有( )
![](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/4ba40728b2b36a869eca5e0058b3cffe.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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名校
5 . 设
是等差数列
的前
项和,若
,则
( )
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eabb3e5ff574b8cd7d0bd32d6f5b5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0675050bc7377c6056b0e62b2570fc1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 若数列
满足
,且
,那么数列
的前
项和
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be29d8f996c54183663d8a954166dc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca94cc07c54c1c41129c9cd2dbca092f.png)
![](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)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 记数列
的前
项和为
,若
,且
是等比数列
的前三项,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88fa0877ffbcd7a4a631bfd0424b9ad2.png)
_________ .
![](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/3903653955c424d3f6135edc5b47e231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f012ac44d919598712e3415cd34345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd90110345f6d50801d1e20486d9e182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88fa0877ffbcd7a4a631bfd0424b9ad2.png)
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2024·全国·模拟预测
8 . 已知等比数列
的前
项和为
,且
,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/a407805fd87a95454f6f63fc4a9a59eb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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23-24高二上·上海·期末
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9 . 定义:对于任意大于零的自然数n,满足条件
且
(M是与n无关的常数)的无穷数列
称为M数列.
(1)若等差数列
的前n项和为
,且
,
,判断数列
是否是M数列,并说明理由;
(2)若各项为正数的等比数列
的前n项和为
,且
,证明:数列
是M数列;
(3)设数列
是各项均为正整数的M数列,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f165a34038d89623948dbe0a669df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5612ce06759d0f77ca029d10083f7d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb8cf8df82fd05e5549ce9c1a6f3524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4818548de2563bc81198611cf3468f13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若各项为正数的等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c8a7aaf355cf3ea778c73eea8ae635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de777c4e44546bcfe26ad5b6bb418052.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292852a3aa9790d661862ff0b67c8971.png)
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(已下线)期末真题必刷压轴60题(22个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)安徽省六安第二中学2023-2024学年高二上学期期末统考数学试卷广东2024届高三数学新改革适应性训练三(九省联考题型)(已下线)第4章 数列(压轴题专练)-2023-2024学年高二数学单元速记·巧练(沪教版2020选择性必修第一册)湖北省荆州市沙市中学2023-2024学年高二下学期3月月考数学试题(已下线)模块五 专题5 全真拔高模拟5(北师大高二期中)(已下线)模块三专题2 数列的综合问题 【高二下人教B版】(已下线)模块三 专题4 数列的综合问题 【高二下北师大版】
23-24高二上·上海·期末
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10 . 如果无穷项的数列
满足“对任意正整数
,都存在正整数k,使得
”,则称数列
具有“性质P”.
(1)若数列
是等差数列,首项
,公差
,判断数列
是否具有“性质P”,并说明理由;
(2)若等差数列
具有“性质P”,
为首项,
为公差.求证:
且
;
(3)若等比数列
具有“性质P”,公比为正整数,且
这四个数中恰有两个出现在
中,问这两个数所有可能的情况,并求出相应数列首项的最小值,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320e7710ac9aafc0ecaf91ba6686cea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4654db8df46552ead8781a1dd2f06d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1029b5231e8dcc6c5b9bf324de42d301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f2572192cc7ca046e9a3155ef3e56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3068733ef2ceda9f1620d5c9bcdfa542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8e68eb4ade6e22982d2df5102d8894.png)
(3)若等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195d74fd21d66a2f647aa4363c1d8f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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(已下线)期末真题必刷压轴60题(22个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)2024届高三新改革适应性模拟测试数学试卷六(九省联考题型)(已下线)第4章 数列 单元综合检测(难点)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)黑龙江省牡丹江市第一高级中学2023-2024学年高二下学期开学考试数学试题