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设直线l:2x+y+2=0关于原点对称的直线为l',若l′与椭圆的交点为A、B,...
设直线l:2x+y+2=0关于原点对称的直线为l',若l′与椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101936721786986/SYS201311031019367217869009_ST/0.png)
的交点为A、B,点P为椭圆上的动点,则使△PAB的面积为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101936721786986/SYS201311031019367217869009_ST/1.png)
的点P的个数为( )
A.1
B.2
C.3
D.4
考点分析:
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(a>0,b>0)的两个焦点为F
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B.
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D.
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