题目
题型:不详难度:来源:
设点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-35211.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-77053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-63711.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-58596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-73132.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-41787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-37382.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-68501.jpg)
(1)求证:三点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-52007.gif)
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-86739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-11291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-99827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-52476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-47900.gif)
答案
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-81486.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-41700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-59084.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-47013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041522-90221.gif)
设切线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041522-30690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041522-43986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041522-53042.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041523-12135.gif)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041523-85892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041523-37116.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041522-30690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041523-27140.gif)
同理
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041523-70419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041524-22865.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041524-37702.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-73132.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041524-30413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041524-92418.gif)
即点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-41700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041525-62914.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041520-37382.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041525-62914.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041525-97467.gif)
(2)垂线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041525-56129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041525-21510.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041525-70600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041526-87916.gif)
设重心
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041526-48892.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041526-39101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041526-39924.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-47013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041527-35632.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-81486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041521-47900.gif)
核心考点
试题【(本小题满分12分)设点在直线上,过点作双曲线的两条切线,切点为,定点。(1)求证:三点共线;(2)过点作直线的垂线,垂足为,试求的重心所在曲线方程。】;主要考察你对曲线与方程的应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041505-39360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041505-10397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041505-47789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041506-10948.gif)
(1)求轨迹T的方程,并说明该方程表示的曲线的形状;
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041506-68699.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041506-70473.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041506-93596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041507-51231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041507-51231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041507-67933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041458-15333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041458-21004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041458-34223.png)
A.2 | B.![]() | C.4 | D.![]() |
抛物线D以双曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041452-22232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041452-98351.gif)
(1)求抛物线D的标准方程;
(2)过直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041452-85070.gif)
(3)在(2)的条件下,若直线PQ交抛物线D于M,N两点,求证:|PM|·|QN|=|QM|·|PN|
(Ⅰ)建立适当的平面直角坐标系,求双曲线C的方程;
(Ⅱ)设过点D的直线l与双曲线C相交于不同两点E、F,
若△OEF的面积不小于2
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041443-78470.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041444-25307.gif)
已知点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041431-30213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041432-29333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041432-86743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041432-53498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041432-11239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041432-27165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041433-87716.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041433-92539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041433-64001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041433-17422.png)
(Ⅱ)若以点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041432-86743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041434-30955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041434-73180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026041434-30955.png)
最新试题
- 1可逆反应A(g)+B(g) 2C(g)在固定容积的容器中进行,如果向容器中充入1molA和1mol B,在某温度下达到平
- 2无价的奖赏 ①当她猛然发现身边的手提包不见了时,吓得冷汗涔涔。那手提包里的钱和银行卡都在其次,关乎“命门”
- 3读下图,我们考试的时间是6月27日,此时地球运动到图中哪两点之间? ( )A.A和B之间B.B和C之间C.C
- 4阅读下列材料(18分)材料一 经济重心转向大西洋后,世界经济进入了从产生到发展的最活跃时期。随着国际竞争的加剧,科学技术
- 5化简求值:①化简:4ab+8﹣2b2﹣9ab﹣6;②先化简,再求值:已知3x2y﹣[2x2y﹣3(2xy﹣x2y)﹣xy
- 62009年夏天,虽然人们对台风莫拉克已经做了准确的预报,但这场台风还是给台湾和福建造成重大损失。这一事例说明:[
- 7下面是常见物质的性质和变化:a.酒精能挥发 b.铁在潮湿的空气里生成铁锈 c.水沸腾变水蒸气 d.二氧化碳能使澄
- 8下列标点符号使用有错误的一项是(2分)A.“最美司机”吴斌用大爱阐释了生命的价值:76秒,吴斌用生命履行了职责;76秒,
- 9设函数2|x-3|+|x-4|.(1)求不等式的解集;(2)若不等式的解集不是空集,求实数a的取值范围.
- 10图所示不正确的是 [ ]A.B.C.D.
热门考点
- 1计算:(1);(2)(2a)3b4÷12a3b2
- 2阅读理解 Coffee experts are willing to pay large sums of mone
- 3阅读下列材料,回答相关问题。(15分)材料1:拉萨市于2008年建设10个热岛效应气象观测点,以监测日益增加的城市热岛效
- 4一个研究性学习小组在探究“通过某种导电材料的电流与其两端电压的关系”时,得出电压U和电流I的数据如下表所示.(1)请在如
- 5某固体物质受热变为气态,这种变化( )A.物理变化B.化学变化C.可能是物理变化,也可能是化学变化D.既有物理变化,又
- 6去河边钓鱼、去野外捉虫、去爬树、去钻洞、打陀螺、放风筝、骑自行车,要不约上几个伙伴,胡吹海侃,或是制定一些永远也无法实施
- 7小明每秒钟跑6米,小彬每秒钟跑5米,小彬站在小明前10米处,两人同时起跑,小明多少秒钟追上小彬[ ]A.5秒 B
- 8(2013·高考湖南卷)古诗文默写。小题1:桑之未落,其叶沃若。________________,___________
- 9关于质量守恒定律,下列叙述中正确的是( )A.煤燃烧化为灰烬,该反应不符合质量守恒定律B.24克镁在空气中完全燃烧生成
- 10. Either you or the headmaster ______ the prizes to the gift