名校
1 . 已知点
在椭圆
上,椭圆的离心率
.
(1)求椭圆C的方程;
(2)椭圆C上不与P点重合的两点D,E关于原点O对称,直线PD,PE分别交y轴于M,N两点.求证:以MN为直径的圆过定点,并求出定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea8a480a2fe03293cb8303da8837d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de85df85401e7e8da683ea4a784963c.png)
(1)求椭圆C的方程;
(2)椭圆C上不与P点重合的两点D,E关于原点O对称,直线PD,PE分别交y轴于M,N两点.求证:以MN为直径的圆过定点,并求出定点坐标.
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名校
2 . 记函数
在点
处的切线为
,若直线
在
轴上的截距恒小于
,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79aefcc30253bfe047de2972de5d21d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de33e16d4ffaa04a92aa1ab5bff144a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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