题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120418-33103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120419-27777.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120418-33103.png)
(Ⅱ)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120419-46037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120419-95785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120420-22637.png)
(Ⅲ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120420-74536.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120420-71357.png)
解析
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120420-98745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120421-65754.png)
故数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120421-99047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120421-90543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120420-71357.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120421-92760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120422-82306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120422-65786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120422-54238.png)
②—①得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120422-88856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120422-91217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120423-60766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120423-43430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120424-51119.png)
所以数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120424-27543.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120424-44604.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120425-16937.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120425-79937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120425-65018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120425-56260.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120411-51937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120411-47482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120412-65411.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120401-93468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120401-21534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120401-93468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120351-20388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120351-42436.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120351-20388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120352-52492.png)
(2)当n取何值时,数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120351-20388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120352-61243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120352-24788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120333-15284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120333-33508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120333-65935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120333-34885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120334-44968.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120322-95767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120323-51127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120323-83449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120323-13854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120323-88757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012120323-83449.png)
A.![]() | B.![]() | C.![]() | D.![]() |
最新试题
- 1在地球仪上,与南、北极距离相等的地方所画的圆圈叫( )A.经线B.经纬网C.赤道D.经线圈
- 2高锰酸钾溶于水时,用______取少量的高锰酸钾放入烧杯中,用______量取一定的水,倒入烧杯中,用______搅拌溶
- 320世纪80年代末,苏联、东欧等社会主义国家相继发生危机,社会动荡,风云骤起。苏东剧变的实质是 [ ]A.政权性
- 4人们常用测电笔辨别家庭电路中的______线与零线.
- 5若tan(),则tan2α的值是
- 6设函数,观察:依此类推,归纳推理可得当且时,.
- 7若圆的一条弦把圆分成1:3的两条弧,则劣弧所对的圆周角等于______.
- 8阅读理解。 It is said that as the popula
- 9已知集合,若对于任意,存在,使得成立,则称集合是“理想集合”,则下列集合是“理想集合”的是( )A.B.C.D.
- 10按要求写句子。1. My favorite city is Kunming.(对画线部分提问) __________
热门考点
- 1一个口袋中装有2个白球和3个红球,每次从袋中摸出两个球,若摸出的两个球颜色相同为中奖,否则为不中奖,则中奖的概率为___
- 2如图甲所示,光滑的水平地面上固定一长为L=1.7m长木板C,板的左端有两小物块A和B,其间夹有一根长为1.0m的轻弹簧,
- 32011年央视一套热播剧《中国地》真实再现了主人公农民赵老嘎带领全家、全村及广大民众浴血奋战,在中国共产党的领导下,与日
- 4— It"s seven o"clock already.I must be leaving now.— OK.____
- 5如图所示,在真空中有一与x轴平行的匀强电场,一电子由坐标原点O处以速度v0沿y轴正方向射入电场,在运动中该电子通过位于x
- 6方程的解是[ ]A.x=1 B.x=3 C.x=5 D.x=7
- 7函数的反函数是 [ ]A.B.C.D.
- 8The school office is required to make its accounts as ____
- 9默写诗文(4分)小题1: ,五十弦翻塞外声。(辛弃疾《破阵子》)小题2:明月别枝惊鹊,
- 10德国哲学家康德对理性做了彻底的哲学探讨,在其《纯粹理性批判》一书中,他提出了一个耐人深思的观点,这个观点是A.因信称义B