名校
解题方法
1 . 已知数列
的前
项和
,数列
满足:
,
.
(Ⅰ)求数列
,
的通项公式;
(Ⅱ)求
.
![](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/5886e031a95a8d52c9306e6b1c518abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b007573b2538d5dc14b33a94b4adc163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e333cd6e61038ba431e7092806d3cb.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56c26ae1048eec77829fb968998d87a.png)
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2020-05-11更新
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1527次组卷
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5卷引用:2020届天津市南开区高考一模数学试题
2020届天津市南开区高考一模数学试题天津市和平区2020-2021学年高三上学期期中数学试题(已下线)天津市耀华中学2020-2021学年高三上学期期中数学试题(已下线)重难点1 数列-2021年高考数学【热点·重点·难点】专练(山东专用)(已下线)专题24 数列求和的常见方法-学会解题之高三数学万能解题模板【2022版】
2 . 定义
为正整数
的各位数字中不同数字的个数,例如
.在等差数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
___________ ,数列
的前100项和为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006d54905e72dac6b9f6fcf1a6ada6d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ebe46bffead42216839a2b4958a420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903304fb655d626931c005a4dbc8ea29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65723ad260705c559714d9b12e20a1fd.png)
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2020-05-09更新
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8卷引用:2020届陕西省商洛市高三下学期高考模拟测试文科数学试题
3 . 设
为数列
的前
项和,
.数列
前
项和为
且
.数列
满足
.
(1)求数列
和
的通项公式;
(2)记
表示
的个位数字,如
,求数列
的前30项的和.
![](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/4300dca231e2f4b37f70900b33439d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/6e926475c154644af560cd152a0f203f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2257d49ff5a72b0f468c6ecaba3049ce.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a7d0e556bfc4abc6a2e6747b7ca4db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5882203e68d6a09fd544202c0ed9a344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/979485f7116e7bbb751f76fd55695bd8.png)
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2020-05-03更新
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4卷引用:湖北省孝感市五校协作体2018-2019学年高三上学期期中文科数学试题
湖北省孝感市五校协作体2018-2019学年高三上学期期中文科数学试题湖北省孝感市五校协作体2018-2019学年高三上学期期中理科数学试题广东省广州市西关外国语学校2020-2021学年高二上学期期中数学试题(已下线)模块二 专题6《数列》单元检测篇 A基础卷 (人教A)
4 . 设
是函数
的极值点,数列
满足
,若
表示不超过
的最大整数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329b1de3500d2e9bbdde2e6cee6822b5.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e361fe153b0f053f5eb53c6ee0b83a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4fb8519aa88d265304ad26a902504a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329b1de3500d2e9bbdde2e6cee6822b5.png)
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5 . 如图,设A是由
个实数组成的n行n列的数表,其中aij (i,j=1,2,3,…,n)表示位于第i行第j列的实数,且aij
{1,-1}.记S(n,n)为所有这样的数表构成的集合.对于
,记ri (A)为A的第i行各数之积,cj (A)为A的第j列各数之积.令![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870d9073bb6e80038a75f78882af0296.png)
(Ⅰ)请写出一个A
S(4,4),使得l(A)=0;
(Ⅱ)是否存在A
S(9,9),使得l(A)=0?说明理由;
(Ⅲ)给定正整数n,对于所有的A
S(n,n),求l(A)的取值集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/767f5a4746f04db68386fac3970b1ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8513848f0793f49d5eff420964a793b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870d9073bb6e80038a75f78882af0296.png)
a11 | a12 | … | a1n |
a21 | a22 | a2n | |
… | … | … | … |
an1 | an2 | … | ann |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
(Ⅱ)是否存在A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
(Ⅲ)给定正整数n,对于所有的A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
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解题方法
6 . 函数
是定义在
上的奇函数,由1,2,…,9这9个数的任意一个排列组成的数列,即
,
,…,
,设
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f213c718655205e9e08d30f083ee2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61cd5f3eb4d66e7ab2d56ba5e587621.png)
A.24 | B.45 | C.125 | D.61 |
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2020-04-22更新
|
205次组卷
|
2卷引用:2019届百师联盟全国高三冲刺考(一)全国I卷数学(文)试题
7 . 函数
,设
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d58c406b37f90b91e58d81c7f1b7814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a30ab3a300cfcc626a18a8bf23d5275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdcfac025396b2662eaab48aeecac3b.png)
A.![]() | B.![]() | C.2018 | D.1009 |
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8 . 已知数列
中,
,
(
),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0468eec40a6f3f0f2162d21ac0e754.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d387bb0f5cd99b8c2a73d2ce60fff96a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0468eec40a6f3f0f2162d21ac0e754.png)
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名校
9 . 设正整数数列
满足
.
(1)若
,请写出所有可能的
的取值;
(2)求证:
中一定有一项的值为1或3;
(3)若正整数m满足当
时,
中存在一项值为1,则称m为“归一数”,是否存在正整数m,使得m与
都不是“归一数”?若存在,请求出m的最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7138cc707c7bec7c0c5a60ffd25c1c2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259b2e755105c0ee479eabf7265a76a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若正整数m满足当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999ac8c1ef39251e07a7fc54cbf7e26e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0623207595425920f16e76a7f8f268b6.png)
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2020-02-23更新
|
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3卷引用:2020届北京市十一学校高三(12月)月考数学试题