椭圆
的离心率为
,以原点为圆心,椭圆短半轴长为半径的圆与直线
相切.
(1)求椭圆的方程;
(2)M,N是椭圆上关于x轴对称的两点,P是椭圆上不同于M,N的一点,直线PM,PN交x轴于D(xD,0)E(xE,0),证明:xD•xE为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e43c3621b12e03422ae9868c78e3327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78c38805c09dcfbcc42103308975a74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b194fdbfbd2ffa5f5651ce9c486a791.png)
(1)求椭圆的方程;
(2)M,N是椭圆上关于x轴对称的两点,P是椭圆上不同于M,N的一点,直线PM,PN交x轴于D(xD,0)E(xE,0),证明:xD•xE为定值.
更新时间:2020-03-15 15:31:02
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【推荐1】已知椭圆
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