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设分别为具有公共焦点的椭圆和双曲线的离心率,P为两曲线的一个公共点,且满足的值为...

6ec8aac122bd4f6e分别为具有公共焦点6ec8aac122bd4f6e的椭圆和双曲线的离心率,P为两曲线的一个公共点,且满足6ec8aac122bd4f6e的值为                                                            (    )

       A.2                        B.6ec8aac122bd4f6e                     C.4                         D.6ec8aac122bd4f6e

 

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