题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061612-28544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061612-61680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061612-19225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-20097.png)
(1)试问点
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-27241.png)
(2)是否在存在
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061612-19225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-27241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-39764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-81914.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-27241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061614-64736.png)
证明如下:
设点
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061614-21076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061614-66257.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061614-97878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061615-68476.png)
所以,点
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-27241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061614-64736.png)
(文科)按证明情况酌情给分
(2)由圆
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061613-39764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061615-43582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061614-64736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061615-97389.png)
而切点的坐标为:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061615-39852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061616-17986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061612-19225.png)
解析
核心考点
试题【已知为坐标原点,点,对于有向量,(1)试问点是否在同一条直线上,若是,求出该直线的方程;若不是,请说明理由;(2)是否在存在使在圆上或其内部,若存在求出,若不存】;主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061607-69356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061607-79191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061608-66170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061608-31198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061608-69494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-76039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-18094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-98901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-76039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061559-18094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-64893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-75171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061600-59932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061601-11810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061601-18446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061554-18070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061554-96213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061555-60444.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061555-36176.png)
(2)若点C使得四边形ABCD为矩形,求点C的坐标,并求该矩形对角线所夹的锐角的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061548-92535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061548-27896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061549-90590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061549-55311.png)
A.300 B.600 C.1200 D.1500
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061540-35882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061540-15332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-59383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-11395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-27279.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061541-56586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061542-25457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061542-26076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104061542-32752.png)
最新试题
- 1已知,如图,AD=AC,BD=BC,O为AB上一点,那么,图中共有( )对全等三角形.
- 2甲、乙两个物理实验小组分别探究“弹力和弹簧伸长的关系”.(1)甲组同学利用图(a)所示的装置,将弹簧的上端与刻度尺的零刻
- 3开学已经有一段时间了,七年级的小明对自己班级同学的名字只知道少数一部分,学校的图书馆在什么地方他也不知道。班级里大部分学
- 4圆C经过点A(2,-1),和直线x+y=1相切,且圆心在直线y=-2x上.(1)求圆C的方程;(2)圆内有一点B(2,-
- 5She ____ the house the whole morning but it seems to be at l
- 6某影片出现了下边的作战示意图,该影片反映的是[ ]A.辽沈战役B.淮海战役C.平津战役D.渡江战役
- 7 The ____ person was in bad health.[ ]A. ill B.
- 8在一次信息技术考试中,某兴趣小组8名同学的成绩(单位:分)分别是:7,10,9,8,7,9,9,8,则这组数据的中位数是
- 9—Do you like basketball?—Yes. It"s____.[ ]A. difficult
- 10Education is not an end, but a means to an end. ______, we d
热门考点
- 1设a,b∈R,a+bi=(i为虚数单位),则a+b的值为( )。
- 2避免遗传病发生的最主要手段,最有效方法和优生的重要措施分别是( )A.遗传咨询、禁止近亲结婚、产前检查B.禁止近亲结婚
- 3“发叔”,一个亲切又富生活气息的名字。他叫吕君发,香港大学颁授的8位名誉大学院士之一。然而,这位年近八旬、头发花白的“院
- 4组织就是由形态相似,结构、功能相同的细胞联合在一起而形成的______.组织的形成是细胞______的结果.
- 5We’re talking about the piano and the pianist _____ were in
- 6阅读下面这则材料,结合本文,谈谈你的感悟。(2分)链接材料 55岁的陈玉蓉是武汉乡办企业的下岗工人。她的儿子叶海滨
- 7已知命题p:∃x∈R,cosx=;命题q:∀x∈R,x2-x+1>0.则下列结论正确的是( )A.命题是假命题B
- 8China’s plan ________ its installed nuclear power capacity b
- 9(10分)已知某市居民生活用电基本价格为每度0.45元,若每月用电量超过a度,超过部分按基本电价的70%收费。(1)某户
- 10已知点P在第三象限,且到x轴的距离为3,到y轴的距离为5,则点P的坐标为( )A.(3,5)B.(-5,3)C.(3