2023高三·全国·专题练习
1 . 设极限
,试证明:
存在时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232fee62317185c45c0fdc41abbd7b79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88084d45d67552dd1348cadffed8e429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60b606335fdbb3e8bfae232d5ef659c.png)
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2 . 已知
,设
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfeaba384e5bbf73b2b5d07eb8eef3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48bf723cd3b71cff063c5270216467.png)
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2023高三·全国·专题练习
3 . 著名的斐波那契数列满足
,
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb6c7c4c02de4c67f60d31ed1139bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf819091322ea0a0c629a8eca8c15ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b57547e0b0a0fd16c017edf98a5b183.png)
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4 . 设
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93bcd6515cde0f7eaa187304c622220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/906ca2abdc336d046147f3c89cac9503.png)
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2023高三·全国·专题练习
5 . 设数列
满足
,证明:对任意的初值
,
存在且等于1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926194374aa84ea8e8d3b818ef92e744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4361b7baf57ec27b60ac4aa637e16a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a460f28a8bf1bfe9d867828402bcccb.png)
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2023高三·全国·专题练习
解题方法
6 . 已知抛物线
与点
,过点
作切线
(
为切点),取点
满足
;过点
作切线
(
为切点),取点
满足
;…依次得到点列
,
,…,
,数列
为单调数列.
(1)求
,
.
(2)证明:
.
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ad7c068b9b7c0fd764cf7746407079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3169b9e651cfe7c781ab1cd05836065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a56f2e56229a722d1f40d74d3967a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89af7170bb5cff9869993aa05c62220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e2d739c9ab27e84464962035775a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2857fac4963b129d99e79dcb3e13d295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0dc36ca4fdb257fb296cf0b9234eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042f6277c98e108cab95992342e4bfd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09490514476657414d8991d633c9d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c5b2ecf3d4a067272790f360b5d05d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87cc7e43a26e8bafbc6c02eb619bea9.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba46062609219b82c694ed3776fde0ad.png)
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2022高二·上海·专题练习
解题方法
7 . 设数列{an}的前n项和为Sn.
(1)若{an}是等比数列,a2=
,S2=
,求
;
(2)若{an}是等差数列,a1=1,d=4,若Sk是数列{an}中的项,求所有满足条件的正整数k组成的集合;
(3)若数列{an}满足a1=1且
,是否存在无穷数列{an},使得a2022=﹣2021?若存在,写出一个这样的无穷数列(不需要证明它满足条件);若不存在,说明理由.
(1)若{an}是等比数列,a2=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66f83db5ca4153087822dec70178904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b5cbf3e7c76886acc2fc0ccd91c6f6.png)
(2)若{an}是等差数列,a1=1,d=4,若Sk是数列{an}中的项,求所有满足条件的正整数k组成的集合;
(3)若数列{an}满足a1=1且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3613cad64aa251ff946b4e0cff555e94.png)
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解题方法
8 . 现有甲、乙、丙三个人相互传接球,第一次从甲开始传球,甲随机地把球传给乙、丙中的一人,接球后视为完成第一次传接球;接球者进行第二次传球,随机地传给另外两人中的一人,接球后视为完成第二次传接球;依次类推,假设传接球无失误.
(1)设乙接到球的次数为
,通过三次传球,求
的分布列与期望;
(2)设第
次传球后,甲接到球的概率为
,
(i)试证明数列
为等比数列;
(ii)解释随着传球次数的增多,甲接到球的概率趋近于一个常数.
(1)设乙接到球的次数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)设第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(i)试证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d4bdc55e0b2ed6cebd27b8315edadb.png)
(ii)解释随着传球次数的增多,甲接到球的概率趋近于一个常数.
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2022高三·上海·专题练习
9 . 已知无穷数列
的首项为
其前n项和为
且
(
),其中
为常数且
.
(1)设
,求数列
的通项公式,并求
的值;
(2)设
,
,是否存在正整数k使得数列
中的项
成立?若存在,求出满足条件k的所有值;若不存在,请说明理由.
(3)求证:数列
中不同的两项之和仍为此数列中的某一项的充要条件为存在整数m且
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4b9e475158c0c9eef9dd015342221c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7a9511c3d1b6d41d17df1559919880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fade3b62af2d51880b021a075dcd551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://img.xkw.com/dksih/QBM/2021/10/26/2837748827766784/2838709742600192/STEM/7fc32bc6ec324f02b776a2efc3a3b665.png?resizew=13)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7335c79ec0592fc36288f5135e86c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8212a513bceafbdb6e7e617a29079c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c1344592c925b273f2cb9b9e47ebbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6760775a38ed18ab8f346346e25de2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636f37adeddc68d0830ecd7d1c61ff8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98b2a1269d8cb234c7cc9d49e75196b.png)
(3)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87a9ef1f87936695fb681df932efd10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54680219b440350ffc5f1f43b3b78e0.png)
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10 . 图形的被覆盖率是指,图形被覆盖部分的面积与图形的原面积之比.通常用字母
表示.如图所示,边长为1的正三角形被
层半径相等的圆覆盖,最下面一层与正三角形底边均相切,每一层相邻两圆外切,层与层相邻的圆相外切,且每一层两侧的圆与正三角形两边相切.记覆盖的等圆层数为
时,等圆的半径为
,
.图中给出
等于1,2,10时的覆盖情形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/8b418677-a88b-4fce-8e18-6293c94b7b24.png?resizew=306)
(Ⅰ)写出
,
的值,并求数列
的通项公式;
(Ⅱ)证明:对任意的层数
,此正三角形的被覆盖率
低于91%.
(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d2adce9c2bb310a074bc39ccc52a3a.png)
![](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/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/8b418677-a88b-4fce-8e18-6293c94b7b24.png?resizew=306)
(Ⅰ)写出
![](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/b4be2164a2c67d6163faee87a10942bb.png)
(Ⅱ)证明:对任意的层数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d553e4a26eb3012410ef7558a5fd6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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