题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112709-29751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112709-14478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-81505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-13739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-61196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-27297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-99512.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-64156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-61196.png)
(Ⅱ)对于满足(Ⅰ)中的
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-61196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-58624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-50229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-74258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-72948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-63603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-69733.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-13739.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-40685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-99480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-98693.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-40685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-21726.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-51878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-40349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-68512.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-64156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-76423.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-47338.png)
(Ⅱ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-14135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-67178.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-97482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-98073.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-83604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-30078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-60363.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-85087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-74258.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-49830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-64841.png)
因为不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-66593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-53569.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-26038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-53569.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-83890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-53081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-80195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-42515.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-93310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-54453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-15464.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-51878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-40349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-68512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-64156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-61196.png)
(II)在(I)的基础上,
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-14135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-98073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-60363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-56914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112720-24187.png)
从而把不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-66593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-53569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-26038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-53569.png)
解:(Ⅰ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112710-13739.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-40685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-99480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-98693.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-40685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-21726.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112713-51878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-40349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-68512.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112711-64156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112714-76423.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-47338.png)
(Ⅱ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-14135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-67178.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-97482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112715-98073.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-83604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-30078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-60363.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112716-85087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112712-74258.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112720-46149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-64841.png)
因为不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-66593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-53569.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-26038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112717-53569.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-83890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-53081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112718-80195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-42515.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-93310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-54453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112719-15464.png)
核心考点
试题【(本小题满分15分)设为数列的前项和,(为常数且,).(Ⅰ)若,求的值;(Ⅱ)对于满足(Ⅰ)中的,数列满足,且.若不等式对任意恒成立,求实数的取值范围.】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112622-69217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112622-44932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112622-95103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112633-56053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112634-53464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112634-60774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112634-78978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112634-97814.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112634-29959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112622-69217.png)
(Ⅲ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112635-17035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112635-12421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112615-55832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112615-27560.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112555-75613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112555-32343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112555-47314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112555-30356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112555-47314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112537-39876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112537-65742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112537-94764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112537-49611.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112537-39876.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112538-92412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112538-29012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112538-35844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112538-48812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112520-47051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112520-71497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112520-47051.png)
(II)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112520-30460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112520-82226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112521-99078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112521-87665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112521-50724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012112521-60343.png)
最新试题
- 1,则A、B、C三点共线的充要条件为( )A. B. C. D.
- 2解方程:。
- 3A、b、C、d四种溶液的pH都小于7,已知四种溶液中C(H+)和C(OH-)之和由大到小的顺序是b>A>d&
- 4In the UK, a woman usually doesn"t like to be asked ______.
- 5看漫画《父母陪读》:父母有抚养教育子女的义务,但让父母每天为我们“陪读”,甚至安排学习计划,恐怕只会让我们的学习能力萎缩
- 6某无色溶液,其中有可能存在的离子如下:Na+、Ag+、Ba2+、Al3+、AlO -2、S2-、CO32-、SO32-、
- 7如下图实验中,如果开始水桶中装满了水,按下饮料罐后水会溢出,越向下按饮料罐,桶中溢出的水也越多,饮料罐受到的 _____
- 8有四位同学进行“用温度计测水温”的实验操作,分别如下图中A、B、C、D所示,其中正确的是( )
- 9函数与的图象关于( )A.直线对称B.轴对称 C.轴对称D.原点对称
- 10【题文】设集合,,则( )A.B.C.D.
热门考点
- 1Great! They have shorts ______ many colors. [ ]A. are B.
- 2阅读下面材料和图,分析完成下列问题。(8分)材料1:该图是“中国人口增长图”。材料2:我国人口形势严峻,为了摸清全国人口
- 3读下列两图,分析回答:注:甲图是中国元朝航海示意图,乙图是中南半岛国家分布图.(1)甲图中的七洲洋就是现在的______
- 4一定质量的理想气体经历了如图所示的A→B→C的三个变化过程,则通过图象可以判断A.B.C三个状态,气体的体积VA、VB、
- 5给下列加粗字注音。 (1)飞窜( ) (2)炽热( ) (3)祈盼( ) (4)畸形(
- 6如图,平面内三条直线交于点O,∠1=30°,∠2=60°,AB与CD的关系是( )A.平行B.垂直C.重合D.以上均有
- 7下表是25°C时某些弱酸的电离平衡常数,下列说法正确的是( )化学式CH3COOHHClOH2CO3Ka1.8×10-
- 8天然气的主要成分是甲烷(CH4),甲烷不仅是一种很好的燃料,而且是一种重要的化工原料。请你根据下列信息回答问题: (1)
- 9小科同学为测定某铁合金的含铁量,做了如下实验,称取11.4g样品,放入质量为50g的烧杯中,再往烧杯内加入足量的100.
- 10如图甲所示,在光滑绝缘水平面内的坐标系xoy中,在0≤x<1.0m区域内存在匀强磁场,磁感应强度B=2.0T,磁场方向垂