1 . 中国古代科学家发明了一种三级漏壶记录时间,壶形都为正四棱台,自上而下,三个漏壶的上底宽依次递减1寸(约3.3厘米),下底宽和深度也依次递减1寸.设三个漏壶的侧面与底面所成的锐二面角依次为
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93fa313adc4ac7608ba9449fd755212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8d4017e1a37acb0c8e00508be472b2.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
2 . 数列
满足
且
,
,
,
构成等差数列.
(1)试求出所有三元实数组(α,β,γ),使得
为等比数列.
(2)若
,求
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f390f47fa5678c9a165c50fb9dec58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be536a2097ded867adac5edebb79906b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e6820c50fa2aa589de5331d7d5f950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13739ca823d61005798cc3298400c6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad28237c0f9ca65341101d9d7e73e73e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
(1)试求出所有三元实数组(α,β,γ),使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4623bc660145c6ff98af7b1753d5357a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
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23-24高二上·上海·期末
名校
3 . 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)
您最近一年使用:0次
2024-01-14更新
|
384次组卷
|
4卷引用: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)
(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
4 . 设数列
,即当
时,
.记
.
(1)写出
,
,
,
;
(2)令
,求数列
的通项公式;
(3)对于
,定义集合
,求集合
中元素的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa7b3c190459af645f8bfb2d287fcde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808d924a0869b4fd83c2af3a9c08c755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21d7086ab24e85a3a109596d2112065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48990b6e63ba2d3697523faab15d4846.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2714e51cd5b5f0529bcad6499c1b9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dcb1ddb73e4087f8cfcc40eead8b893.png)
(3)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b04dd5926d27d2fe7c375030018df26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0720f874c2f8b28c8c289dddb362f336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d88909e5fcc68bc96d756f2d65060c.png)
您最近一年使用:0次
5 . 设集合A为含有n个元素的有限集.若集合A的m个子集
,
,…,
满足:
①
,
,…,
均非空;
②
,
,…,
中任意两个集合交集为空集;
③
.
则称
,
,…,
为集合A的一个m阶分拆.
(1)若
,写出集合A的所有2阶分拆(其中
,
与
,
为集合A的同一个2阶分拆);
(2)若
,
,
为A的2阶分拆,集合
所有元素的平均值为P,集合
所有元素的平均值为Q,求
的最大值;
(3)设
,
,
为正整数集合
(
,
)的3阶分拆.若
,
,
满足任取集合A中的一个元素
构成
,其中
,且
与
中元素的和相等.求证:n为奇数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0d7559d8dfa8236ca9d4b1853fbdec.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0d7559d8dfa8236ca9d4b1853fbdec.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0d7559d8dfa8236ca9d4b1853fbdec.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fb515ccb4e5ead5c9328e633c703cc.png)
则称
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0d7559d8dfa8236ca9d4b1853fbdec.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca717c6a55e786238e64f7ebd69b9b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4dbc287804fded7b1d4d0b87a4adc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4892ba321f70f83dc5d3a24d904fba9f.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea7fcdb5423c1c8c032a3efcf245682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f494d7ee74b344609e47122af349c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b145bf79ddb43eb1732e071b1effa3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
您最近一年使用:0次
6 . 已知集合
(
是整数集,m是大于3的正整数).若含有m项的数列
满足:任意的
,都有
,且当
时有
,当
时有
或
,则称该数列为P数列.
(1)写出所有满足m=5且
的P数列;
(2)若数列
为P数列,证明:
不可能是等差数列;
(3)已知含有100项的P数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e554250001b2c743536fea8f59e04.png)
是公差为
等差数列,求d所有可能的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ece160fb8294524c209edfec06cecea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0ecd416d6dc3d886b7bf73fc285dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a6a847b6bd281fdc9eb6bdcd1b0755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cebf26922807a452d6fe1876a73ae08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b71af6590f0f369c164a054a8b63bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a205f096c854a2f7cd71255056f9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e77b18184548725f5e0413d5df6e2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaab4227241678abe353931f1b4a882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e03d2f8c1590ce63b229db5793da0a3.png)
(1)写出所有满足m=5且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)已知含有100项的P数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e554250001b2c743536fea8f59e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6610f20cc871e8e8951fd3937804dd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4184597c94d1077842234d5f6c1d00a3.png)
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解题方法
7 . 已知
是数列
的前
项和,
,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/b5d111e1236fa8bd7916f7b1f2fe2afe.png)
A. ![]() |
B. ![]() |
C. 当![]() ![]() |
D. 当数列![]() ![]() ![]() |
您最近一年使用:0次
2022-09-03更新
|
1600次组卷
|
5卷引用:江苏省百校联考2022-2023学年高三上学期第一次考试数学试题
江苏省百校联考2022-2023学年高三上学期第一次考试数学试题湖北省武汉市第十九中学2023届高三上学期11月线上月考数学试题第4章 数列(B卷·能力提升练)-【单元测试】2022-2023学年高二数学分层训练AB卷(苏教版2019选择性必修第一册)(已下线)4.2.2 等差数列的前n项和公式(同步练习)-【一堂好课】2022-2023学年高二数学同步名师重点课堂(人教A版2019选择性必修第二册)(已下线)专题10 数列通项公式的求法 微点1 观察法(不完全归纳法)、公式法
名校
解题方法
8 . 高斯是德国著名的数学家,享有“数学王子”的称号,人们把函数
,
称为高斯函数(其中
表示不超过x的最大整数,例如:
,
).已知数列
的首项
,前n项和记为
.若k为函数
,
值域内的任意元素,且当整数
时,都有
成立,则
的通项公式为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e3204e4dc47a448860779349efcedf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ea02e718c638f94174db08de61ea3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1aed47b3da7febc5379a7d46773c9a.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab988b91d5de8edf58c54db012c2e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce485410257c9c1fae9d87ce3e44cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52eecd38954cd0ca3fb26328a39bb859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf70a562d0cdfa53595c7893d706e46c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
名校
解题方法
9 . 已知等差数列
(公差不为零)和等差数列
的前n项和分别为
,
,如果关于x的实系数方程
有实数解,那么以下2021个方程
中,无实数解的方程最多有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b15318f72ca26e4c37fd79c7c99b2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4fc3ae5c55b94ff7c8fd8a2c1479c05.png)
A.1008个 | B.1009个 | C.1010个 | D.1011个 |
您最近一年使用:0次
2022-05-10更新
|
1524次组卷
|
8卷引用:重庆市第一中学校2022届高三下学期5月月考数学试题
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名校
解题方法
10 . 对于有限数列
,
,
,
,定义:对于任意的
,
,有:
(i )
;
(ii )对于
,记
.对于
,若存在非零常数
,使得
,则称常数
为数列
的
阶
系数.
(1)设数列
的通项公式为
,计算
,并判断2是否为数列的4阶
系数;
(2)设数列
的通项公式为
,且数列
的
阶
系数为3,求
的值;
(3)设数列
为等差数列,满足-1,2均为数列
的
阶
系数,且
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddcdb2da504ba468d10e26134b46327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d7da87286b3dd83f0e7d4e5b496eac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c70fdfa2d88876d54feb6d890204e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5d5bdce735c2dbe4bc07727c119459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
(i )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8329865917b8a177cafbba3c80ee1563.png)
(ii )对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686b332872c51b433befe65fbe773380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4632dd98afcce0d49f5f4b438dab024d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da493db80b421a09904f1aea6a8576a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
(1)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a89d99d11a58a2e6ac83d0d6d2a5119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18841a2d420196560e6d4df505cc4063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb42a8b2956bcbdc702f2675862405b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8040c494c55340314d0681aaa5a0cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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