题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131821-40914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131821-86735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131822-98380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131822-10636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131822-50875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131822-78169.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131823-27802.png)
解析
由题意得 cos∠NMF=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131823-89672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131823-89227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131823-27802.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131805-84546.png)
(1)求抛物线D的方程;
(2)已知动直线l过点P(4,0),交抛物线D于A,B两点
(i)若直线l的斜率为1,求AB的长;
(ii)是否存在垂直于x轴的直线m被以AP为直径的圆M所截得的弦长恒为定值?如果存在,求出m的方程,如果不存在,说明理由。
如图,斜率为1的直线过抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131724-26279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131724-50107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131724-19534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131725-66702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131725-38484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131725-66702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131725-90900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131724-50107.png)
(Ⅰ) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131726-23557.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131726-79155.png)
(Ⅲ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131726-39278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131726-16077.png)
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131657-73854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131657-36867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131657-36867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131657-64843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131658-99403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131658-70151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131657-64843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131658-52649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131658-92068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131658-70151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-67753.png)
(1)求曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-67753.png)
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-35165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-67753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-80384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-35165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131659-35165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131604-41440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131604-76741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131604-76741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131605-69722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131605-64139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131605-79789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131605-27166.gif)
(1)求抛物线的方程.
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131606-48797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025131606-21057.jpg)
最新试题
- 1He listens to the teacher as ____ as your cousin.A.carefulB.
- 2某篮球队6名主力队员在最近三场比赛中投进的三分球个数如表所示:队员i123456三分球个数a1a2a3a4a5a6
- 3“春雨惊春清谷天,夏满芒夏暑相连,秋处露秋寒霜降,冬雪雪冬小大寒。”人们最早可以用到这一成就,是在[ ]A.春秋
- 4下列关于分子和原子的说法中不正确的是( )A.分子和原子都在不停地运动B.分子和原子都是构成物质的微粒C.原子是不能再
- 5Nowadays everyone is responsible for________a harmonious soc
- 6阅读下面的宋词,然后回答问题。(7分)临江仙陈与义高咏楚词酬午日,天涯节序匆匆。榴花不似舞裙红。无人知此意,歌罢满帘风。
- 7李明从小学到初中,成绩一直很好,可自从学会玩电子游戏后,就被迷住了。作业完不成,上课没精打采,还常常为了玩游戏整夜住在游
- 8△ABC中,∠B=90°,AB=(2,3),AC=(1,k),则k=( )A.113B.-113C.23D.-23
- 9下列有关世界降水量分布的正确叙述是( )A.赤道地区终年高温,气流上升冷却,易成云致雨,故降水多B.回归线附近,大陆西
- 10(本题满分10分)求过直线2x+3y+5=O和直线2x+5y+7=0的交点,且与直线x+3y=0平行的直线的方程,并求这
热门考点
- 1阅读下面这首诗,按要求答题。春 归唐 庚①东风定何物?所至辄苍然。 小市②花间合,孤城③柳外圆。禽声犯寒食,江色带新年。
- 2图中正确表示了光在空气和玻璃的分界面的光路图是( )
- 3下列各组词语中加粗字的注音或书写有误的一项是[ ]A.蓦然 拮据(jié) 与日俱增 栩栩如生(
- 4二、阅读理解阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。 Not many ye
- 5(1)维生素C的结构简式为 请回答:①维生素C的分子式是 ②向维生素C的水溶液中
- 6下面语段中画线的词语,使用不恰当的一组是( )读书绝不是要使我们“散心消遣”,而是要使我们集中心智;不是要用虚假的
- 7如图,已知OA=OB,那么数轴上点A所表示的数是____________.
- 8如果使用杠杆是为了省力,那么动力臂应当 阻力臂;如果为了少移动距离,那么动力臂应当 阻力
- 9煅烧石灰石样品(杂质不含钙元素且不发生反应)时,某质量随加热时间的变化关系如图所示,有关分析中正确的是( )A.若纵坐
- 10实验室用双氧水制取氧气时,操作过程中合理的排列顺序是( )①检验装置的气密性 ②待