题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040451-83086.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040451-96567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040451-90828.gif)
则△PF1F2的面积为 ( )
A. | B.1 | C. | D.2 |
答案
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040443-11552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040444-94028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040444-87594.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040444-37949.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040444-42599.png)
①双曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040436-32016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040437-38817.gif)
②方程
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040437-65313.gif)
③设A、B为两个定点,
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040437-67234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040437-55437.gif)
④过抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040438-28289.gif)
等于5的直线有且只有两条。
⑤过定圆C上一点A作圆的动弦AB,O为原点,若
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040438-46268.gif)
轨迹为椭圆
其中真命题的序号为 (写出所有真命题的序号)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040424-99114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040425-68171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040425-61718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040425-84609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040425-68171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040425-66937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-52108.gif)
(I)求动点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040425-68171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-92067.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-17442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-92067.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-76614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-28508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040427-43205.gif)
(Ⅲ)在轨迹
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040426-92067.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040427-31082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040427-24503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040427-65007.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040420-92495.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040420-47940.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040420-47612.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040420-41535.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040420-44558.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040421-71785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040421-58434.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040421-91013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040421-91013.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
已知抛物线的焦点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040408-59247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040408-58237.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040408-47603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040408-54733.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040408-59247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040409-46105.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040409-93362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040409-46105.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040409-93362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040409-43288.gif)
(Ⅰ)求抛物线的标准方程;
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040409-54013.gif)
(Ⅲ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040410-93373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040410-19111.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040410-11919.gif)
最新试题
- 1下列反应中.属于氧化还原反应,但水既不作氧化剂也不作还原剂的是( )A.Cl2+H2O⇌HCl+HClOB.SO2+H
- 2曲线y=在点(1,1)处的切线方程为A.x-y-2=0B.x+y-2=0C.x+4y-5=0D.x-4y-5=0
- 3 ____, his mother saw him playing games with other children.
- 4用函数单调性证明在上是单调减函数。
- 5如果一组数据8,9,x,3的平均数是7,那么数据x=( )。
- 6作为低成本信息交换和共享平台的互联网的发展催生了新的经济模式,某校小学生小张就是一位叫“换客”的时尚一族。他将自己上网闲
- 7化合物B是有机合成中间体,制取C4H4O4和E的转化关系如下图所示。已知C能使溴水褪色。 回答下列问题: (1)指出反应
- 8A市、B市和C市分别有某种机器20台、20台和16台.现在决定把这些机器支援给D市36台,E市20台.已知:从A市调运一
- 9 抗日战争是中国近代历史上最伟大的民族解放战争,是近代中国人民反对外敌入侵第一次取得完全胜利的民族解放战争。
- 10水是一种重要资源,与人类的生存及工农业生产息息相关。以下有关说法不正确的是( )A.水在不同温度下都能汽化B.水结冰时
热门考点
- 1【题文】设,则 =
- 2中国水资源的时空分布特点及对策?____________________________________________
- 3下列说法正确的是 ( )①活化分子间的碰撞一定能发生化学反应②普通分子有时也能发生有效碰撞③升高温度会加快反应速率,原
- 4如图所示,一导线弯成半径为a的半圆形闭合回路。虚线MN右侧有磁感应强度为B的匀强磁场,方向垂直于回路所在的平面。回路以速
- 5如图所示,一个圆环的环心在O处,PO与直径AB夹角为60°,QO与直径AB夹角为30°,若以其直径AB为轴做匀速转动,则
- 6Never give up! Keep _____ please. [ ]A.
- 7Height is just one of the thousands of features (特征) that yo
- 8作文:阅读下列材料,按要求写一篇文章。小蜗牛问妈妈:“为什么我们从生下来,就要背负这个又硬又重的壳呢?”妈妈说:“因为我
- 9Our manager allowed _______to take a holiday next week.A.you
- 10计算: