22-23高二下·上海·期末
1 . 设满足以下两个条件的有穷数列
为n(
)阶“期待数列”:
①
;
②
.
(1)分别写出一个单调递增的3阶和4阶“期待数列”;
(2)若某
(
)阶“期待数列”是等差数列,求该数列的通项公式;
(3)记n阶“期待数列”的前k项和为
(
),试证:
(i)
;
(ii)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ec0b97655e6bd7004df04457c493ac.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa0fca4198a6d5c5b76e5e1716dc4e2.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4830a6ec5e0ffd7074b854b4ecdc19.png)
(1)分别写出一个单调递增的3阶和4阶“期待数列”;
(2)若某
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394aee19f94c2b70fcce1d69b31dc7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699dfd96d64e59252e384847629c7a75.png)
(3)记n阶“期待数列”的前k项和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0a9523f2084cf17b8656c11ab1d95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/541e541ef98215381bb9120cd39020ca.png)
(i)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7575a54621b480d9d1e0efa5935d8f47.png)
(ii)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fbfe923e23263b5ae34ee75bb430ab.png)
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名校
解题方法
2 . 已知数列
的前
项和为
且
;等差数列
前
项和为
满足
.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和;
(3)设
,若
,对任意的正整数
都有
恒成立,求
的最大值.
![](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/ae734ad099abbb2f7efe7d7a6a4169fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f7448e55d3e37fb987e875e2325ed3.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/1ff173d5445740f3e9bbd58f8b9813f1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc41b25dbff264536c6e65695484a675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e968bf7783430c58c9f8c9c6e47e6ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1275b12f777f1e88fbadc45dda6622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ff82e739e407a4f72a0fb0c61b88fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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2023-07-15更新
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979次组卷
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3卷引用:天津市重点校2022-2023学年高二下学期期末联考数学试题
解题方法
3 . 记等差数列
的n和为
,数列
的前k 项和为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a996c4e29bcc381353e072eb04c11b0.png)
A.若![]() ![]() ![]() |
B.若当且仅当![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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4 . 在①
,②
这两个条件中任选一个,补充在下面问题中,并解答下列问题.
已知数列
的前n项和为
,
,且满足__________.
(1)证明:数列
是等差数列,并求
的通项公式;
(2)设
,数列{
}的前n项和为
.
(i)求
;
(ii)判断是否存在互不相等的正整数p,q,r使得p,q,r成等差数列且
成等比数列,若存在,求出满足条件的所有p,q,r的值;若不存在,请说明理由注:如选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144b0ed4cf457d4861d5a9fa929a3be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0736606a7538d6380b847b5a440a372.png)
已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81969a1dd5a3ca22d2dfb8adb22406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(ii)判断是否存在互不相等的正整数p,q,r使得p,q,r成等差数列且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd176b51a573d67eef4fce9fbd66fdcb.png)
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2023-07-05更新
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1025次组卷
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5卷引用:江西省萍乡市稳派联考2022-2023学年高二下学期5月月考数学试题
5 . 在数列
中,
.在等差数列
中,前
项和为
,
,
.
(1)求数列
和
的通项公式;
(2)设数列
满足
,数列
的前
项和记为
,试判断是否存在正整数
,使得
?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa960b83e70e40e60e53a6d4334c0fe.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe5fa40132bde317eb91fa3a399da23.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb8be0cd38e3e7f24ee873621d22731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5fb39455abdcb71e7d35357c8569f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2023-06-20更新
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618次组卷
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2卷引用:上海市宝山区2022-2023学年高二下学期期末数学试题
6 . 若一个数列的奇项为公差为正的等差数列,偶项为公比为正的等比数列,且公差公比相同,则称数列为“摇摆数列”,其表示为
,若数列
为“摇摆数列”且
,
,则:
(1)求
的通项公式;
(2)若
,求数列
的前
项和
.(注:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610a9b17aedbeee1681297f41e2774a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03b007be99a17613246b5ea1ff86d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ef4b0c02ac06ff86afede29d70c938.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0f044dc82a12fd1c71872f2ac12d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63ce2096afea66022f5ff11bc763a8e.png)
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7 . 已知数列
是等比数列,其前
项和为
,数列
是等差数列,满足
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e42572df2690c6bcacb93724a807fa.png)
(1)求数列
和
的通项公式;
(2)记
,求
;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.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/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e847afa90d4f7f874584aa48d396b419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ff1f46d13653a0e314fe2c525e7d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e42572df2690c6bcacb93724a807fa.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c76333b20db29981a18fc0b94f7741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/088933c82db929cef6093c55fa9618f5.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef41bb62b30d3006621090523b983dbb.png)
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2023-06-14更新
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1356次组卷
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3卷引用:天津市武清区杨村第一中学2023届高三下学期第一次热身练数学试题
真题
名校
8 . 已知
是等差数列,
.
(1)求
的通项公式和
.
(2)设
是等比数列,且对任意的
,当
时,则
,
(Ⅰ)当
时,求证:
;
(Ⅱ)求
的通项公式及前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35e133418e9dbd8f81528b4b7ff9c25.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e8e5b901d8f8a8b6ec7740f1b55ed4.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a6bc55d5eb2c3d085b62ffcd8d138d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2daddb01510526b8fa639b18635e986d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e7d5ea07ebd45f587cbab2b3fd77ba.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99380bd8acd91cb1ffbd49e896d34f1d.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2023-06-08更新
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12511次组卷
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21卷引用:2023年天津高考数学真题
2023年天津高考数学真题(已下线)专题7 等比数列的性质 微点2 等比数列前n项和的性质专题05数列(成品)(已下线)专题15 数列不等式的证明 微点1 反证法证明数列不等式(已下线)专题11 数列前n项和的求法 微点1 公式法求和(已下线)2023年天津高考数学真题变式题16-20江苏省淮阴中学等四校2023-2024学年高三上学期期初联考数学试题河北省邢台市邢台部分高中2024届高三上学期11月期中数学试题(已下线)第05讲 数列求和(练习)宁夏银川市第二中学2023-2024学年高二上学期月考二数学试卷(已下线)等差数列与等比数列(已下线)第3讲:数列中的不等问题【练】(已下线)重难点03:数列近3年高考真题赏析-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第二册)(已下线)专题6.2 等比数列及其前n项和【十大题型】(已下线)重难点10 数列的通项、求和及综合应用【九大题型】(已下线)专题30 等比数列通项与前n项和(已下线)专题21 数列解答题(文科)-3(已下线)专题21 数列解答题(理科)-3安徽省六安第一中学2024届高三适应性考试数学试题专题06数列专题11数列
9 . 如图,某数阵满足:每一行从左到右成等差数列,每一列从上到下成公比相同的等比数列,数阵中各项均为正数,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550427147909013f0491fe8a24d9a5d4.png)
________ ;在数列
中的任意
与
两项之间,都插入
个相同的数
,组成数列
,记数列
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4331b9fb70a31f8f02b003eea6054c4e.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f75e8a3038e0c054a23817196079209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e9bee3a8f1a37ac6c60ae8796027eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550427147909013f0491fe8a24d9a5d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6fd28652117b5c5c61d9032bf78f259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f867d0ca7748f1d788aa81ebaf9bb3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f91e65e0726d85ac43389dc345abda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ea71117a2bf34302a0d2017e1c60e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c75f960d4e68b4405a28cae0eaceda1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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/4331b9fb70a31f8f02b003eea6054c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb936f339f336ed6cc820b803dbd9caf.png)
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名校
10 . 已知首项为2、公差为
的等差数列
满足:对任意的不相等的两个正整数i,j,都存在正整数k,使得
成立,则公差d的所有取值构成的集合是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d169a02afabbe304cf64b355bf71742a.png)
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2023-06-02更新
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896次组卷
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4卷引用:上海市嘉定区第一中学2023届高三三模数学试题
上海市嘉定区第一中学2023届高三三模数学试题(已下线)专题17 数列探索型、存在型问题的解法 微点1 数列探索型问题的解法(已下线)4.1 等差数列(第1课时)(十大题型)(分层练习)-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)2024届高三新高考改革数学适应性练习(7)(九省联考题型)