焦点：___________焦距__________表示椭圆的集合______________________ 椭圆的标准方程： (焦点在x轴上)__________________(焦点坐标)________________________ (焦点在y轴上)________________ _(焦点坐标)_________________________ a、b、c的关系：a_____b；c2___a2___b2 如何区分焦点在哪个轴上？___________________________________________ 椭圆的图象：(焦点在x轴) (焦点在y轴) 几何性质：范围：(焦点在x轴)_____ ______________(焦点在y轴)___________________ 对称性：___________________________________________________________ 顶点坐标：_________________________________________________________
