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1 . 天文学家卡西尼在研究土星及其卫星的运行规律时发现:平面内到两个定点的距离之积为常数的点的轨迹是卡西尼卵形线(Cassini Oval).在平面直角坐标系中,设定点为
,
,点O为坐标原点,动点
满足
(
且为常数),化简得曲线
.下列四个命题中,正确命题的序号是_____________ .
(将你认为正确的命题的序号都填上)
①曲线E既是中心对称又是轴对称图形;
②当
时,
的最大值为
;
③
的最小值为
;
④
面积不大于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6dc791ae552024ea0df7905bf190f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace7c9e3da8613175ca07c54c116127a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca887802a8e012c7c42b09a58de314f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5101920afab0ef0ec689628207a8538a.png)
(将你认为正确的命题的序号都填上)
①曲线E既是中心对称又是轴对称图形;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759b29a7b2b3735306f1a650355a7858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186b089ab7f74d2b92ee9b556e5e3ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827bec361fa9658bc190b57633f2b5aa.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfe1cad1ce47339827ac5047af4647d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e89b6eca35e34c863e832a2c661db.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002ed1ebb2cb936e10ab478789f91c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c46fcd1c49b5523af44624f57aec97.png)
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2021-05-10更新
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3卷引用:吉林省长春市十一高中2020-2021学年高二下学期第二学程考试数学(文)试题