解题方法
1 . 设点
分别为椭圆
的左、右焦点,则椭圆C的离心率为______________ ;经过原点且斜率不为0的直线l与椭圆C交于P,Q两点,当四边形
的面积最大时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc9c2ee7fbe10e9392492c68138c739.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533b93dd6eb6b474481247736699c76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb9c075a320b0fe23145061b1fb0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc9c2ee7fbe10e9392492c68138c739.png)
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解题方法
2 . 已知椭圆
,左右焦点分别为
,直线
与椭圆
相交于
两点.
(1)求椭圆的焦点坐标及离心率;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bf37fb661ccc2fdd67407269708df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec89d17a1b8f7961e2f1f27c2d50685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求椭圆的焦点坐标及离心率;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c07ebcbfacda073208d483c58e8a84.png)
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3 . 已知
是椭圆
的左、右焦点,点P为C上一点,O为坐标原点,
为正三角形,则C的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41a767b1010b9a0cf89ad9986dd5f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da54d380c177d93a565ad62d4054283a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
4 . 已知椭圆
:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
,双曲线
:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679fff3c550021fdc85c2683d0af6405.png)
,
.设椭圆M的两个焦点分别为
,
,椭圆M的离心率为
,双曲线N的离心率为
,记双曲线N的一条渐近线与椭圆M一个交点为P, 若
且
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f82eb4ba631d0f50d848aa6e576b379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679fff3c550021fdc85c2683d0af6405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a3a82d6b1b6ed16c30367f038c16bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427d892acbbf6db1da8cff8ad927ab22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33558881906c228c262ff8024dcfc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a99190a8fd29c36d5a002e3197cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2427943a38dcd93c9ec9b735ffc9fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95ad75dec0a1d39e196ffa133194e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64478547eef44fbcea5a4a6038d3dc9e.png)
A.![]() | B.![]() |
C.2 | D.![]() |
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