题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234647-57230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234647-81147.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-76006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-77446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-94112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-41828.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-24375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-94112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-71138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-43133.jpg)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-71138.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-46446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-57854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-77446.gif)
答案
(Ⅰ)略
(Ⅱ)
解析
解:
(Ⅰ)将直线
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-76006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-72984.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-14685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-86703.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-94112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-53999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234650-64809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234650-67355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234650-98098.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234650-24808.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234650-67355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234651-77534.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234651-20046.gif)
(Ⅱ)由于
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234651-88534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234651-61207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234651-24350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-30314.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-56067.gif)
则有
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-49538.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-53446.gif)
① - ②,得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-83127.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-12917.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234652-77185.gif)
核心考点
试题【设是坐标平面上的一列圆,它们的圆心都在轴的正半轴上,且都与直线相切,对每一个正整数,圆都与圆相互外切,以表示的半径,已知为递增数列.(Ⅰ)证明:为等比数列;(Ⅱ】;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/20191012/20191012234643-66456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-34214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-74308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-66456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-11018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234644-51901.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-66456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234622-73717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-37085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-52192.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-18475.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-69596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-43985.gif)
(1)试求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234622-73717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234622-73717.gif)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234624-55699.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234624-67316.gif)
(3) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234624-98545.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-25454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-53317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-91293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-41186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-56598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-40621.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-96571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-56598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-56598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-15260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234552-83730.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234552-56746.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234543-57085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234543-14516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234543-36462.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234544-59398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234544-43063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234544-95936.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234544-92002.gif)
A.18 | B.24 | C.60 | D.90 |
最新试题
- 1下列有关煤和石油叙述正确的是( )A.煤干馏可以得到甲烷、苯和氨等重要化工原料B.煤的干馏和石油的分馏都是物理变化C.
- 224. China Construction, an edition de luxe is not a weekly o
- 3若一定质量的理想气体分别按图所示的三种不同过程变化,其中表示等容变化的是______________(填a→b、b→c或
- 4一个总体含有1000个个体,以简单随机抽样方式从该总体中抽取一个容量是n的样本,已知其中指定的某个个体被抽取的概率是0.
- 5 —Sir, can I pass the examinations this time?—That depends o
- 6________ is often the case with children, Tom was completely
- 7计算:35°35′35″×5=______.
- 8 I used to going to the countryside to draw animals and plan
- 920世纪二三十年代,纽约流行一首儿歌:“梅隆拉响汽笛,胡佛敲起钟,华尔街发出信号,美国往地狱里冲!”受儿歌中所反映的社会
- 10陈胜、吴广起义军建立政权的地点在[ ]A.大泽乡B.渔阳C.成阳D.陈
热门考点
- 1阅读下面的文言文,完成问题。爱莲说 水陆草木之花,可爱者甚蕃。晋陶渊明独爱菊。自李唐来,世人盛爱牡丹。予独爱莲之出淤泥
- 2在一次夏令营活动中,小明同学从营地A点出发,要到C地去,先沿北偏东70°方向走了500m到达B地,然后再沿北偏西20°方
- 3下图是一个反射弧模式图,下列分析中,正确的是①S是感受器,M是效应器 ②S是效应器,M是感受器 ③Ⅰ是传入神经,Ⅲ是传出
- 4阅读右下角的图表,用简明的语言概述云天小区房价走势变化的基本特点,不使用具体数字(包括年份),含标点不超过35字。(3分
- 532.(15分) 读下面五幅岛屿图,完成下列要求(除必须用汉字作答的以外,其余问题皆填写各岛的英文代号)。(1)上面五幅
- 6下列属于脊椎动物的是[ ]A.蝗虫 B.章鱼 C.鲤鱼 D.鲍鱼
- 7如图,AB∥CD,∠1=120°,∠ECD=70°,∠E的大小是________
- 82010年11月23日,第16届亚运会跳水展开女子双人10米跳台的争夺,如图所示,中国队陈若琳和汪皓夺取金牌.在亚运会高
- 9电流看不见、摸不着,判断电路中是否有电流时,我们可通过电路中的灯泡是否发光去确定,这是科学研究中常用的一种方法。下面是小
- 10选修4-4:坐标系与参数方程已知极坐标的极点在平面直角坐标系的原点O处,极轴与x轴的正半轴重合,且长度单位相同.直线l的