已知数列
的首项
,且
,记
.
(1)求数列
的通项公式;
(2)已知数列
满足
,
,
是数列
的前
项和,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b260566aa5a4cfa1d1a6678be9bf27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1f4c3f043b59fcc35e9a95cf45bc02.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6dcba920904a03e3f950e962cc8c7ad.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1ee88beaddafb0d0a185c3a8e0dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8843f5e6f90e6455ba6481d1bd5ec7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd84694030a6877033e244f12cd837e.png)
更新时间:2020-05-27 23:59:49
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐1】已知数列
满足
.
(1)求
的通项公式;
(2)设
为数列
的前
项和,解关于
的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e80342d3f022ba87c2387c108b89ead.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a379f33f9af7a762d714c1c710945fc9.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】已知数列
),若
为等比数列,则称
具有性质
.
(1)若数列
具有性质
,且
,求
、
的值;
(2)若
,求证:数列
具有性质
;
(3)设
,数列
具有性质
,其中
,若
,求正整数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01be122e820d09f9c1e174ab856efcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef5631b07a7206210e66ae899a32750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd23821efad830370392d63b669cd01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d199f9235e3bd36bfa78c3772e941896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaf542829b99205948fa97442c3db92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f134cea3dde46e8a0de6828573b165a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f531de968d6869ff27575d6efb2a8db2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900a10d0685d864ec91c344741f78def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831b10743f56067416ea29adff7aa8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9467b45de03f36e05f9dea34b1051706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-问答题
|
较难
(0.4)
【推荐3】在学习强国活动中,某市图书馆的科技类图书和时政类图书是市民借阅的热门图书.为了丰富图书资源,现对已借阅了科技类图书的市民(以下简称为“问卷市民”)进行随机问卷调查,若不借阅时政类图书记1分,若借阅时政类图书记2分,每位市民选择是否借阅时政类图书的概率均为
,市民之间选择意愿相互独立.
(1)从问卷市民中随机抽取4人,记总得分为随机变量
,求
的分布列和数学期望;
(2)(i)若从问卷市民中随机抽取
人,记总分恰为
分的概率为
,求数列
的前10项和;
(ⅱ)在对所有问卷市民进行随机问卷调查过程中,记已调查过的累计得分恰为
分的概率为
(比如:
表示累计得分为1分的概率,
表示累计得分为2分的概率,
),试探求
与
之间的关系,并求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)从问卷市民中随机抽取4人,记总得分为随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
(2)(i)若从问卷市民中随机抽取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5f8c954584c7fe53b09ea1169bbb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0d7559d8dfa8236ca9d4b1853fbdec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b3d5a6659f79a6b35b3a7d7c1116af.png)
(ⅱ)在对所有问卷市民进行随机问卷调查过程中,记已调查过的累计得分恰为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28652e52c0b02a343e618935ea625cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85af7d14012c35ffdca9d3fa5a15e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed900c88cf1ca707255cd73398f6321.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】已知数列
满足
(
,且
),且
,设
,
,数列
满足
.
(1)求证:数列
是等比数列并求出数列
的通项公式;
(2)求数列
的前n项和
;
(3)对于任意
,
,
恒成立,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ec795c016151d50ced08795e8f2186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc97237d3006f403edcd153ed34569fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa5ff2506a5d01502f07c80f024fc8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400f2d28274786ddcef7d91466a77005.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187ee1ea3b7e47a6283314322e5decf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd692d57128f3344f19e472f094d7566.png)
您最近一年使用:0次
【推荐2】已知数列
的前
项和为
,且
,
,在数列
中,
,
,
.
(1)求证:
是等比数列;
(2)若
,求数列
的前
项和
;
(3)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/4555dca34cc0ad25f9648d19bcbb69da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361386446d504a14471b9fd89130f1c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e7219dfbe7be0215dee7a156dcbe7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361386446d504a14471b9fd89130f1c8.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39aec262f629c86894f56992ed4dfa0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988eaa7df9f44a371d7d4a7d646ffc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b375ccd1720dd5682b28dd651eb82d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15526f7c892333030073b85fc3baee6.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc0bdefe6ea4cc508dd42ee6061106b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次