1 . 设
,A分别是椭圆
的左焦点和右顶点,点P为椭圆上异于A点的任意一点,则使得
成立的点P的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b939a0c044b842cdc258e516a6d1de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02875cf8f12ec3f3874a388440217721.png)
A.1 | B.2 | C.3 | D.4 |
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2 . 已知椭圆
:
的离心率是
,则椭圆
的焦距是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e14769c42f63b31aac0353195e80d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知
是双曲线
的焦点,
是双曲线
的一条渐近线,离心率等于
的椭圆
与双曲线
的焦点相同,
是椭圆
与双曲线
的一个公共点,设
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7042bfec79bce6ca42ad30f70719c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6617bfdc4ae73c1cc0a4767d5c881f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8971d919f90df75c50f97c53066431e6.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() ![]() |
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2012·湖北武汉·一模
4 . 如果方程
表示双曲线,则下列椭圆中,与该双曲线共焦点的是
![](https://img.xkw.com/dksih/QBM/2012/7/25/1570936982855680/1570936988106752/STEM/a3735e5ba515425c85e13f9204b21813.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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