设点
,
,若
的周长为
,则动点
的轨迹方程是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace57db024d8a0a1cb59505b0652b919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8febb879c88dff8b18a2362f2dfbc37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
更新时间:2018-01-13 20:57:48
|
【知识点】 利用椭圆定义求方程
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