高考真题往往隐含着一些对一般性结论的探究,对这些题目的研究可以很好地帮助理解题目的本质,也能从中挖掘出比较重要的结论.而圆锥曲线作为解析几何中最为重要的曲线,圆锥曲线的切线与通径所在直线及相应准线的交点到焦点距离之比等于圆锥曲线的离心率,对这一结论的揭示体现了对圆锥曲线统一重要性质的理解. The real college entrance examination often implies some of the general conclusions of the study of these topics can be very good to help understand the nature of the problem, but also to dig out the more important conclusions.And conic curve as the most important analytic geometry curve , The ratio of the tangent of the conic curve to the diameter of the straight line where the path is located and the corresponding point of intersection to the focal distance is equal to the eccentricity of the conic. The revelation of this conclusion reflects the unification of important properties of the conic.