题目
题型:不详难度:来源:
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025454-91619.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025454-70056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025455-61940.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025454-91619.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025455-40355.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025455-23264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025455-65440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025455-73904.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025455-23264.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025456-63469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025456-72921.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025456-68121.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025456-95695.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025457-11420.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025457-12692.gif)
(Ⅱ)设等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025457-11467.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025457-47072.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025458-29603.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025458-90283.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025457-47072.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025457-11467.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025458-32538.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025458-67253.gif)
解析
核心考点
举一反三
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025447-33136.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025447-95918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025447-13622.gif)
(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025447-33136.gif)
(2) 求数列的前n项和
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025448-27288.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025437-94786.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025437-40885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025438-54997.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025437-94786.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025438-39535.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025438-96068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025438-39535.gif)
(Ⅱ)令bn=
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025438-60199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025438-39816.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025439-61524.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025439-49845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025431-33155.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025431-49252.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025431-16895.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025431-43167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025431-41189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025432-82142.gif)
A.35 | B.33 | C.31 | D.29 |
A.6 | B.7 | C.8 | D.9 |
证明以下命题:
(1)对任一正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025411-50487.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025411-11657.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025411-14696.gif)
(2)存在无穷多个互不相似的三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025411-67282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025411-69594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013025412-34330.gif)
最新试题
- 1On hearing the news of the road accidents, his face ________
- 2书面表达。 假如你是李丽,你的笔友Mary给你来信了,想了解你家的情况。假设下表中是你家家庭成员的主要情况,请你
- 3下列物质能改变固体溶解度的是( )A.增加溶剂质量B.增加溶质质量C.升高溶液温度D.增大溶液压强
- 4函数中,自变量x的取值范围是[ ]A.x>2B.x≥2C.x≠2D.x≤2
- 5This is a story completely by him, so don’t rust him.A.d
- 6阅读下面的文字,在横线上补写一段话,要求语意明确,语言得体。 在熙熙攘攘的汽车售票大厅的一角,一位60岁左右的男子似乎
- 7如图①所示,在直角梯形ABCD中,∠BAD=90°,E是直线AB上一点,过E作直线l∥BC,交直线CD于点F.将直线l向
- 8海洋是丰富的化学资源宝库。通过晾晒海水,可以得到含少量泥沙的粗盐,经提纯后可得到纯净的NaCl。如图是粗盐提纯的实验操作
- 9补写出下列名篇名句中的空缺部分。(1) 既无伯叔,终鲜兄弟,____________,____________。外无期功
- 10在如图的山坡上植树,已知坡比i=1:2,要使株距(相邻两树间的水平距离)为4米,则斜坡上相邻两棵树之间的坡面距离是___
热门考点
- 1水是人类生活中不可缺少的物质。下列关于水的说法或做法中正确的是[ ]A.过滤能除去水中所有杂质B.工业废水若无色
- 2某化肥厂以氨和空气(其中氧气的体积分数为0.2)为原料生产硝酸铵过程如下:其中反应①为4NH3+5O24NO+6H2O⑴
- 3写出如图所示的程序框图运行后的结果,若R=8,则a=( )。
- 4某中学九年级毕业学生张明因欠学校150元杂费,被学校扣发准考证而耽误了中考,张明将学校告上法庭。你认为他告学校的理由是[
- 5人体的血液循环可以分为 循环和 循环两部分。这两部分血液循环是同时
- 6材料一:秦二世元年七月,征调900名穷苦百姓到渔阳戍守边疆,他们走到大泽乡这个地方。陈胜、吴广也在这次正调中,当时又遇到
- 7A、B为两块水平放置的金属板,通过闭合的开关S分别与电源两极相连,两极中央各有一个小孔a和b,在a孔正上方某处一带电质点
- 8附加题:设A、B是抛物线C:y2=2px(P>0)上异于原点O的两个不同点,直线OA和OB的倾斜角分别为α和β,当α,β
- 9找出能替换画线部分的选项。Please take your time. There"s much time left.
- 10 I hope ____ tomorrow .A.him to be betterB.he will be better