1 . 设数列
满足
,
.
(1)计算
,猜想
的通项公式;
(2)用数学归纳法证明上述猜想,并求
前
项和
.
![](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/6672b832da87660e7919ea3f7d50bf0f.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe61d313eeca8ba47478a9de40540db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)用数学归纳法证明上述猜想,并求
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
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3卷引用:北京市昌平区新学道临川学校2021-2022学年高二下学期期中考试数学试题
名校
2 . 已知数列
,从中选取第
项、第
项、
、第
项
,若
,则称新数列
为
的长度为m的递增子列.规定:数列
的任意一项都是
的长度为1的递增子列.
(Ⅰ)写出数列
的一个长度为4的递增子列;
(Ⅱ)设数列
.若数列
的长度为p的递增子列中,任意三项均不构成等差数列,求p的最大值;
(Ⅲ)设数列
为等比数列,公比为q,项数为
.判定数列
是否存在长度为3的递增子列:
?若存在,求出N的最小值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5f59bc23cf55f56312c9ed9806371f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6af9e7b1c23db5584ad8521d4444d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc2b6b23da3e065820c15cf6c675e20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608d034715f9b1dfb306f9c89d383582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e636879245230dd00a3ab3cbcfbfd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aeb1cbdad3d73306ca2ec905bfe961f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82079a5446d448fb1bea730b968d7e02.png)
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅰ)写出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33339fa6f26d9c8a9459648af2485e3d.png)
(Ⅱ)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f86c68104c0f89e3306b37265d6852a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅲ)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec57bf360c18a9d0b3d8f89124b1257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a64e9c933af98e51cfeb0113961a88.png)
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2021-01-21更新
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6卷引用:北京市昌平区第一中学2021-2022学年高二下学期期中考试数学试题
3 . 给出下列两个推理:
①在
中,若D为BC的中点,则
,由此推测:在空间四面体ABCD中,若M为
的重心,则
.
②无限不循环小数都是无理数,因为e=2.7182818459045…是无限不循环小数,所以e是无理数.
对于上述两个推理,下列判断正确的是( )
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2878d5bfebcca4e871866555da697f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e85dbe68ce7262783dac84731fed393.png)
②无限不循环小数都是无理数,因为e=2.7182818459045…是无限不循环小数,所以e是无理数.
对于上述两个推理,下列判断正确的是( )
A.①是演绎推理,②是类比推理 |
B.①是归纳推理,②是演绎推理 |
C.①是类比推理,②是演绎推理 |
D.①是类比推理,②是归纳推理 |
您最近一年使用:0次
2020-08-05更新
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3卷引用:北京市昌平区新学道临川学校2021-2022学年高二下学期期中考试数学试题