解题方法
1 . 已知
,点P满足
,动点M,N满足
,
,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96f0155ccaa463d45dbdecda29b6636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1442f2bcbe29f4b17ddc20bd9e52a519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebee78de2de62b9a131f5330d359a905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7352a957df124ba5b2f14d50b00496d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8eb37a4dd75318dcbd836395e575bd.png)
A.3 | B.![]() | C.4 | D.![]() |
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2022-11-26更新
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856次组卷
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5卷引用:贵州省遵义市2023届高三上学期第三次月考数学(文)试题
2 . 在平面直角坐标系
中,已知点
,
,点M满足:
.记M的轨迹为C.
(1)求曲线C的方程;
(2)过点
的直线l交曲线C于M,N两点,过点M,N分别作曲线C的切线,两切线交于点
,试探究:动点
是否在一条定直线上?若不在,请说明理由;若在,求出该直线的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b69f4f4c0d380494e2aaf221af71a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15f0553f40fba61ee0d0106e5df80fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de6edf9a6cfd6842b420bba20a2395d4.png)
(1)求曲线C的方程;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8f0e31afe073fb06dc6c2509d06add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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