1 . 设点
,
,直线
,
相交于点M,且它们的斜率之积为k,对于结论:
①当
时,点M的轨迹方程为
;
②当
时,点M的轨迹方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f3a64f2953b8bc7951a01f83fe1f83.png)
③当
时,点M的轨迹方程为
.
其中正确结论的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d71fb4d3db6c9922d3b605a6d40e529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe2c124d5bbbbe666ee145cd454b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02f266bd253738e315e84231235f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a143573e9fe53e6a861154bf5b4c27c3.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91da74d94cf68a7d263b9ae5e594ea86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f3a64f2953b8bc7951a01f83fe1f83.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882037b9ce104ecc496e0f31a139361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
其中正确结论的个数为( )
A.0 | B.1 | C.2 | D.3 |
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2020-04-01更新
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515次组卷
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3卷引用:山东省泰安市新泰市第一中学东校2023-2024学年高二上学期冬季学科竞赛数学试题