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椭圆是圆锥曲线中最重要的内容之一,因而也是高考命题的热点之一.椭圆给出了两种定义,椭圆的第一定义是把平面内与两个定点F1,F2的距离的和等于常数2a(2a|F1F2|)的点的轨迹叫做椭圆;椭圆的第二定义是到一个焦点和相应准线的距离比是常数e(0e1)的点的轨迹称为椭圆.若能恰当运
The ellipse is one of the most important contents of the conic curve and is therefore one of the hot spots of the college entrance examination proposition. The ellipse gives two definitions. The first definition of the ellipse is to equal the distance between the plane and the two fixed points F1, F2. The trajectory of the point of the constant 2a(2a|F1F2|) is called an ellipse; the second definition of the ellipse is the trajectory of a point to a point where the distance between the focus and the corresponding guideline is constant e(0e1) is called an ellipse.