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解题方法
1 . 已知λ,μ为常数,且为正整数,λ≠1,无穷数列{an}的各项均为正整数,其前n项和为Sn,对任意的正整数n,Sn=λan﹣μ.记数列{an}中任意两不同项的和构成的集合为A.
(1)证明:无穷数列{an}为等比数列,并求λ的值;
(2)若2015∈A,求μ的值;
(3)对任意的n∈N*,记集合Bn={x|3μ•2n﹣1<x<3μ•2n,x∈A}中元素的个数为bn,求数列{bn}的通项公式.
(1)证明:无穷数列{an}为等比数列,并求λ的值;
(2)若2015∈A,求μ的值;
(3)对任意的n∈N*,记集合Bn={x|3μ•2n﹣1<x<3μ•2n,x∈A}中元素的个数为bn,求数列{bn}的通项公式.
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2016-12-04更新
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638次组卷
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2卷引用:2016届上海市建平中学高三上12月月考理科数学试卷
2 . 已知数列
为等差数列,
,
的前
和为
,数列
为等
比数列,且
对任意的
恒成立.
(Ⅰ)求数列
、
的通项公式;
(Ⅱ)是否存在非零整数
,使不等式
对一切
都成立?若存在,求出
的值;若不存在,说明理由.
(Ⅲ)各项均为正整数的无穷等差数列
,满足
,且存在正整数k,使
成等比数列,若数列
的公差为d,求d的所有可能取值之和.
![](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/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/034ba25825c13725931c483aa47c9363.png)
比数列,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca8a0c2499f7a5e1860d23940cd87b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅱ)是否存在非零整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0bc042352e2f4d4a5cc80492ad120d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(Ⅲ)各项均为正整数的无穷等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc25e825ee0cd0b1708aa39349468716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78bf40d71329e4898bd227324173cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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3 . 已知数列
与
满足
,
.
(1)若
,且
,求数列
的通项公式;
(2)设
的第
项是最大项,即
(
),求证:数列
的第
项是最大项;
(3)设
,
(
),求
的取值范围,使得
有最大值
与最小值
,且
.
![](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/c6ece8e9ffa8e174590cb9e0a9fab6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f41a0eb95a51bc64caca93cb3dc2cf.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef61f0d996f76193db07159d89dfe09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7e9f86738335a22298559db41037a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b33b7a3717e96535a53c53a847b9e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f41a0eb95a51bc64caca93cb3dc2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7e9f86738335a22298559db41037a4.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54395be36a4e0746b555b3882b107a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fe8f20c9882a52fce09a8fdf97ede9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f41a0eb95a51bc64caca93cb3dc2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54cb2decd0d50d4031f7e7b7cb34fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4fd1f05bd7ccb2399dcc3ca96834a55.png)
您最近一年使用:0次
2016-12-03更新
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8卷引用:上海市吴淞中学2018-2019学年高三上学期10月月考数学试题
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