解答题-证明题 适中0.65 引用1 组卷2322
椭圆有两顶点A(﹣1,0)、B(1,0),过其焦点F(0,1)的直线l与椭圆交于C、D两点,并与x轴交于点P.直线AC与直线BD交于点Q.
![](https://img.xkw.com/dksih/QBM/2011/6/15/1570238676590592/1570238681989120/STEM/0b6e049a11d84283b9f2ff96f32c01b1.png)
(Ⅰ)当|CD|=
时,求直线l的方程;
(Ⅱ)当点P异于A、B两点时,求证:
为定值.
![](https://img.xkw.com/dksih/QBM/2011/6/15/1570238676590592/1570238681989120/STEM/0b6e049a11d84283b9f2ff96f32c01b1.png)
(Ⅰ)当|CD|=
![](https://img.xkw.com/dksih/QBM/2011/6/15/1570238676590592/1570238681989120/STEM/59351947e4054a3a9b9e46dd8b510a91.png)
(Ⅱ)当点P异于A、B两点时,求证:
![](https://img.xkw.com/dksih/QBM/2011/6/15/1570238676590592/1570238681989120/STEM/e234b24d839c419ab38945e0f28e325d.png)
2011·四川·高考真题
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