P,Q,M,N四点都在椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382018_ST/0.png)
上,F为椭圆在y轴正半轴上的焦点.已知
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与
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共线,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382018_ST/3.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382018_ST/4.png)
共线,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382018_ST/5.png)
.求四边形PMQN的面积的最小值和最大值.
考点分析:
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解不等式:解关于x的不等式:
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(其中a>0)
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如图,M是抛物线上y
2=x上的一点,动弦ME、MF分别交x轴于A、B两点,且MA=MB.
(1)若M为定点,证明:直线EF的斜率为定值;
(2)若M为动点,且∠EMF=90°,求△EMF的重心G的轨迹方程.
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以下四个关于圆锥曲线的命题中
①设A、B为两个定点,k为非零常数,|
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|-|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382015_ST/1.png)
|=k,则动点P的轨迹为双曲线;
②设定圆C上一定点A作圆的动点弦AB,O为坐标原点,若
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=
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(
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+
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),则动点P的轨迹为椭圆;
③方程2x
2-5x+2=0的两根可分别作为椭圆和双曲线的离心率;
④双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382015_ST/6.png)
-
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=1与椭圆
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+y
2=1有相同的焦点.
其中真命题的序号为
(写出所有真命题的序号)
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已知点A在圆C:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382014_ST/0.png)
上运动,点B在以
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382014_ST/1.png)
为右焦点的椭圆x
2+4y
2=4上运动,求|AB|的最大值
.
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从集合{1,2,3…,11}中任选两个元素作为椭圆方程
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225142569338281/SYS201311012251425693382013_ST/0.png)
中的m和n,则能组成落在矩形区域B={(x,y)||x|<11且|y|<9}内的椭圆个数为
.
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