1 . 已知动点P到直线
的距离是P到点
距离的2倍,点P的轨迹记为C.
(1)证明:存在点
,使得
为定值.
(2)过点F且斜率
的直线l与C交于A,B两点,M,N为x轴上的两个动点,且
,
,若
,求k.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
(1)证明:存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ed50b7ddc736c4a2fad6a58135e03f.png)
(2)过点F且斜率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99e9ab44437147165c319705daad0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/339f691f01e9fb0e30570d5daad31002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0dc4ea85e09c94960e4f1c20657e117.png)
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2023-01-09更新
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4卷引用:青海省西宁市大通回族土族自治县2023届高三一模数学(理)试题