题目
题型:不详难度:来源:
设等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061632-39742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061632-93853.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061633-10351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061633-70862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061642-98982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061632-93853.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061632-39742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061642-45867.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061643-19964.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061643-18188.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061643-90458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061643-18231.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061644-69657.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061644-55049.gif)
解析
核心考点
举一反三
若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061533-17146.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061533-35221.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-71349.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-18516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061542-54602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061542-46609.gif)
(Ⅰ)写出一个满足
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061543-81692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061543-29139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-18516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-71349.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061543-59772.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-71349.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061543-60502.gif)
(Ⅲ)对任意给定的整数n(n≥2),是否存在首项为0的E数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-71349.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061544-89881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061534-71349.gif)
(本小题满分12分)
已知等差数列{an}中,a1=1,a3=-3.
(I)求数列{an}的通项公式;
(II)若数列{an}的前k项和Sk=-35,求k的值.
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061434-56691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061434-19971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061434-56691.png)
A.128 | B.80 | C.64 | D.56 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061413-36958.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061414-98869.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061414-33853.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061414-36723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061414-89306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061406-97813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061406-54875.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061406-83607.gif)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061406-62689.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061407-86342.gif)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061406-97813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061407-37350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011061407-39611.gif)
最新试题
- 1撞南绿色无公害蔬菜基地有甲、乙两种植户,他们种植了A、B两类蔬菜,两种植户种植的两类蔬菜的种植面积与总收人如下表:说明:
- 2瓷器可分为青瓷、青白瓷和白瓷。“九秋风露越窑开,夺得千峰翠色”,“大邑烧瓷轻且坚,扣如哀玉锦传。君家白碗胜霜雪,急送茅斋
- 3关于国际贸易格局的叙述,正确的是[ ]A、发达国家主要从发展中国家进口原料、粮食、燃料等初级产品 B、发达国家主
- 4(1)课本设计了如图一所示实验,其目的是通过比较H2O2的分解速率来比较____________________,可通过
- 5—Are you coming to Alice’s party?—I’m not sure.I _______ go
- 6为了探究电动机为什么会转动,小明根据电动机主要构造制作了一台简易电动机.他用回形针做成两个支架,分别与电池的两极相连,用
- 7A、B、C三种短周期元素在周期表中的相对位置如下图所示,已知A、C分别与B形成化合物X和Y,A与B的质子数之和等于C的质
- 8【题文】方望溪删改八家文,屈悔翁改杜诗,人以为妄。余以为,八家与少陵复生必有低首俯心而遵其改者必有反复辩论而不遵其改者要
- 9如右图所示,设A为反比例函数图象上一点,且矩形ABOC 的面积为3,则这个反比例函数解析式为 .
- 10读亚洲图,回答下面问题。(每空1分,共8分)“我们亚洲,山是高昂的头;我们亚洲,河像热血流…… ”听到这首《亚洲雄风》的
热门考点
- 1将适量酵母放入5%葡萄糖溶液中摇匀后,等量分装到下列锥形瓶中,放置在相同的适宜温度环境条件下培养。10d后,产生酒精最多
- 2下列划线的各句熟语使用不恰当的一项是( )A.就业问题时常困扰着大家。没工作的人找工作,有工作的人又存在着随时有穿小
- 3________ modest and confident person he is!A.WhatB.What aC.H
- 4 ( 2011重庆江津, 2,4分)下列式子是分式的是( )A.B.C.D.
- 5下列叙述中正确的是( )①垃圾分类投放,可利用资源,减少污染②保护生物的多样性,就是严禁对生物资源的开发利用③生活中应
- 6我国领土最南端在( )A.台湾省B.海南岛C.雷州半岛D.曾母暗沙
- 7乐音的三要素是指:音调、响度和________。
- 8My mother is not in very good shape, and he has _____ tennis
- 9函数y=log3(9-x2)的定义域为A,值域为B,则A∩B=______.
- 10Whenever human populations have lived in forest areas, they