1 . 已知数列
满足
,且
,等差数列
的前n项和为
,且
,
,若
恒成立,则实数λ的值可以为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d17f0cf0d7b8f13cfe24036bbd46a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef900d01c01723f44bbe1f925e8d3db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19993c95a8990b60552075b9f4a7a344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc3f2d8ef9d7aae5ddf1bf880ace8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aded78e5a2bb24a202bfe9fb68bd4a0.png)
A.-36 | B.-54 | C.-81 | D.-108 |
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2 . 北宋数学家贾宪创制的数字图式(如图)又称“贾宪三角”,后被南宋数学家杨辉引用、n维空间中的几何元素与之有巧妙联系、例如,1维最简几何图形线段它有2个0维的端点、1个1维的线段:2维最简几何图形三角形它有3个0维的端点,3个1维的线段,1个2维的三角形区域;……如下表所示.从1维到6维最简几何图形中,所有1维线段数的和是( )
| ![]() |
A.56 | B.70 | C.84 | D.28 |
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3 . 在①
,②
这两个条件中任选一个,补充在下面问题中并解答.
问题:已知数列
为递增数列且满足
,
且________,求数列
的前
项和
.
注:如果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/c734f347314f64b76e48ab0aeb8984b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb7cba4abad7d50257ada7d9f188d28.png)
问题:已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55d8d7bb99a601fe0d3b97b8e70579d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.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/08eb71ecf8d733b6932f4680874dbbf3.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
名校
4 . 已知常数
,设各项均为正数的数列{an}的前n项和为Sn,满足:
,
(
).
(1)若λ = 0,求数列{an}的通项公式;
(2)若
对一切
恒成立,求实数λ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b16a54a53d087739334e80459c8273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5150930a1912c0412bbe7d8827db6fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
(1)若λ = 0,求数列{an}的通项公式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac243b27930161d2f0a9e01009dfb8af.png)
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352888094588928/2353112749735936/STEM/93d6ea07495842a390f0cf8278b04dfc.png?resizew=48)
您最近一年使用:0次
2019-12-12更新
|
470次组卷
|
4卷引用:2016届海南省华侨中学高三考前模拟理科数学试卷
2016届海南省华侨中学高三考前模拟理科数学试卷【全国百强校】江苏省南通市海安高级中学2018-2019学年高二上学期期中考试数学试题(已下线)专题6.5 数列的综合问题(练)-江苏版《2020年高考一轮复习讲练测》(已下线)专题10 数列通项公式的求法 微点1 观察法(不完全归纳法)、公式法
解题方法
5 . 已知
是递增的数列,
是等比数列.满足
,
,且对任意
,
.
(1)求数列
的通项公式;
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb612af0c2406ed397c7a8afc76f394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef6c4c2b03e222cd9343ee93980eb3f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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6 . 已知数列
中,
.设
,若对任意的正整数
,当
时,不等式
恒成立,则实数
的取值范围是_______ .
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/03825b5bfb33445d933670482f08a12e.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/14a0ee54c80f4672b41fc706946459f8.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/c241168b6739467488db0000ac3f78e3.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/f7f9e17090234d528818400d8d965b3d.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/f43f254f71d44f38a80620bac8b46256.png?resizew=65)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/21126f796deb4f12ac134ca765c26d74.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572863498960896/1572863505252352/STEM/91293becee8e4df497f6c988b1033172.png?resizew=9)
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