椭圆
的焦点坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-12-19 07:04:59
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【推荐1】已知椭圆
与双曲线
焦点相同,且椭圆
上任意一点到两焦点距离和为10,则椭圆
的短轴长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3c8789aec12a93bf514cf8e24d52ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.3 | B.6 | C.![]() | D.![]() |
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【推荐2】若椭圆的方程为
,且它的两个焦点和原点
将此椭圆的长轴四等分,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27202733e05cc65e30dbbad8b7f11a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.4 | B.5 | C.6 | D.5或3 |
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【推荐1】双曲线
与椭圆
的焦点相同,则a等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36e858bb2b512701c65e064c14f5131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313c38828362ccc9f3871dfac28753b0.png)
A.1 | B.![]() | C.1或![]() | D.2 |
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【推荐2】已知双曲线
的焦点与椭圆
的焦点重合,则此双曲线的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d79a9d7c59c061259eba07baded4941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa77802f9a072a800ee5098f668d5d9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】曲线
与曲线
(
)的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f219575dd7bb6c3d8912a0d6d81a294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e95aa27511bf7b9203025aa3243565.png)
A.长轴长相等 | B.短轴长相等 | C.离心率相等 | D.焦距相等 |
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解题方法
【推荐2】若椭圆
的焦点在
轴上,其离心率为
,则椭圆
的短轴长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa7d9500bafba03f0891dd81811be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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