已知数列
是无穷数列.若
,则称
为数列
的1阶差数列;若
,则称数列
为数列
的2阶差数列;以此类推,可得出数列
的
阶差数列,其中
.
(1)若数列
的通项公式为
,求数列
的2阶差数列的通项公式;
(2)若数列
的首项为1,其一阶差数列
的通项公式为
,求数列
的通项公式;
(3)若数列
的通项公式为
,写出数列
的
阶差数列的通项公式,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5653b60d16ec4e653518f0562680250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703cdc7668aa4dcab77e448249f9446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28182f211c5a2647e5963f94b7e39615.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0dd3ce757a2ad080ece0e34424fb05f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fef6975d285cabcf6be67c78f30d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7614e7ffdeb8b48c6aaf660c4fef3e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
21-22高二下·北京丰台·期末 查看更多[3]
北京市丰台区2021-2022学年高二下学期期末数学试题(已下线)4.4 数学归纳法(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)(已下线)专题02 等比数列4种常考题型归类【好题汇编】-备战2023-2024学年高二数学下学期期末真题分类汇编(北京专用)
更新时间:2022-07-08 11:17:41
|
相似题推荐
【推荐1】若无穷数列
满足
是公差为k的等差数列,则称
为
数列.
(1)若
为
数列,
,
,求数列
的通项公式;
(2)数列
的前n项和为
,
,
,
为
数列,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90f288efb1cd0b04fc73ca47a36ad6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a77664bffdb95b972d1fd826fdbb134.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6625ab886c35fd3aa18c941b61764472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab7d59ce066c8f0b346719003f8e28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1ee88beaddafb0d0a185c3a8e0dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7662d8f87acee60eb9e4788cdc2bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653d892617859edf817a4799c10f39d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be45d0777156f769b6679136a42f82b.png)
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名校
解题方法
【推荐2】若给定数列
,对于任意的
,若满足
,则称
为“
型数列”.若数列
满足:
,
,当
时,
.
(1)判断数列
是否为“
型数列”,并证明;
(2)求数列
的通项公式;
(3)若
,
,使不等式
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b44c9c095c6817ad1908118a8fe5a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f54ea75eebaf67b500b8f80f050f1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbf7a076d6cfbbabf8d9ac6f814add7.png)
(1)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a8c42bbeebd847037ea509702132bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f54ea75eebaf67b500b8f80f050f1e6.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878b4bc8b23c9f486874016f32221333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a67d9c9d7a6771dd2d3578cd4ab05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4741ab55cc092588667a7a1397fc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐1】
统计学中将
个数
的和记作
(1)设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e44b9f978f064998129ba8d3b6ddf3.png)
,求
;
(2)是否存在互不相等的非负整数
,
,使得
成立,若存在,请写出推理的过程;若不存在请证明;
(3)设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ae6558e11384a40f3a338b73385ee1.png)
是不同的正实数,
,对任意的
,都有
,判断
是否为一个等比数列,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab329a4b1aaf89eea2f73d83959dfd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1c31a81f198c443e71b83ca662939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f3fad909cf570d7f25d10f59e67f0b.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e44b9f978f064998129ba8d3b6ddf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fc82353331abee0828dee9b38c08f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657c8449fc4369cd27df10c230953130.png)
(2)是否存在互不相等的非负整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d02a8555da4dbbc7820a50a95b071ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/317488d9acc73e487ca6468570102661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803b7348adfe11cdd20566bd5db195db.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ae6558e11384a40f3a338b73385ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30f0c33581d65209dbb0aaff67f55b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c4cdcb32e3a0ce527c13978c022a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f587e9183ff15195bf48f63e72d835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2cfe87b7d5b2ac6dd669c1561c9f831.png)
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【推荐2】已知数列
满足
,
.
(1)若数列
是常数数列,求m的值.
(2)当
时,证明:
.
(3)求最大的正数m,使得
对一切整数n恒成立,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a3def0fd2ff496d99c13c6f933d404.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a5945ce5c2114af8c18718ca8dc899.png)
(3)求最大的正数m,使得
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解题方法
【推荐1】若数列{an}满足:对任意n∈N*,均有an=bn+cn成立,且{bn},{cn}都是等比数列,则称(bn,cn)是数列{an}的一个等比拆分.
(1)若an=2n,且(bn,bn+1)是数列{an}的一个等比拆分,求{bn}的通项公式;
(2)设(bn,cn)是数列{an}的一个等比拆分,且记{bn},{cn}的公比分别为q1,q2;
①若{an}是公比为q的等比数列,求证:q1=q2=q;
②若a1=1,a2=2,q1•q2=﹣1,且对任意n∈N*,an+13<anan+1an+2+an+2﹣an恒成立,求a3的取值范围.
(1)若an=2n,且(bn,bn+1)是数列{an}的一个等比拆分,求{bn}的通项公式;
(2)设(bn,cn)是数列{an}的一个等比拆分,且记{bn},{cn}的公比分别为q1,q2;
①若{an}是公比为q的等比数列,求证:q1=q2=q;
②若a1=1,a2=2,q1•q2=﹣1,且对任意n∈N*,an+13<anan+1an+2+an+2﹣an恒成立,求a3的取值范围.
您最近一年使用:0次
【推荐2】设数列
的前n项和为
.若对任意
.总存在
.使得
.则称
是“M数列”.
(1)判断数列
(
)是不是“M数列”,并说明理由;
(2)设
是等差数列,其首项
.公差
.且
是“M数列”
①求d的值和数列
的通项公式:
②设
,直接写出数列
中最小的项.
![](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/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad52924df9291d5d191d18e09374ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc637439f68efdbd8fb7d3cb34109da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8ec29f45e28624133ace854b9ca648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e789387bf82c893b83cb8f2007f060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
①求d的值和数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793f8bdae1a421833a31797fa685aabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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