已知
,令
,则S取到的值可以有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4624e8d563209a69f1bb1965c91f05cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be775b27ce9610296f5add703ec7aefc.png)
A.1 | B.2 | C.3 | D.4 |
更新时间:2022-11-18 12:18:33
|
相似题推荐
【推荐1】法国数学家加斯帕尔•蒙日发现:椭圆的两条互相垂直的切线的交点轨迹是以椭圆中心为圆心的圆(称为椭圆的蒙日圆).已知椭圆
的左、右焦点分别为
,左、右顶点分别为
,点
是椭圆上异于
的动点,点
是该椭圆的蒙日圆上的动点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bdca942888700310971d0e2c70e624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.该椭圆的蒙日圆的方程为![]() |
B.存在点![]() ![]() |
C.使![]() ![]() |
D.直线![]() ![]() |
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【推荐2】已知椭圆
,
,
分别为椭圆
的左右顶点,
为椭圆的上顶点.设
是椭圆
上一点,且不与顶点重合,若直线
与直线
交于点
,直线
与直线
交于点
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279cefeb5c389a37a71e5fd3925f5954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c2cc110e46ae4b3432814810e28bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.若直线![]() ![]() ![]() ![]() ![]() |
B.直线![]() ![]() |
C.![]() |
D.![]() |
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【推荐1】已知椭圆C:
的左、右焦点分别为
,
焦距为
,离心率为
,P为椭圆左半边上一点,连接
交y轴于点N,
,其中O为坐标原点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfbfcfe248439929f0b33f712471b0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
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A.椭圆的长轴长为3 |
B.![]() |
C.若点Q在椭圆C上,则![]() ![]() |
D.点P到x轴的距离为![]() |
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解题方法
【推荐2】已知直线l:
交椭圆C:
于不同两点A,B,且椭圆C经过点
,
,则下列结论正确的是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e454c7161999e2a67138869f59d319b.png)
A.椭圆C离心率为![]() |
B.椭圆C的焦距是![]() |
C.![]() ![]() |
D.椭圆上任意一点到直线l的距离最大值为![]() |
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