1.本单元重、难点分析重点:圆锥曲线的两种定义、标准方程和几何性质;特征参数a,b,c,e,p的几何意义及相互间的关系;直线与圆锥曲线的位置关系的判断与应用.难点:圆锥曲线的性质的综合运用,直线与圆锥曲线的位置关系及其弦的有关问题,参数问题的讨论;综合题解法的探求.圆锥曲线 1. The focus of this unit’s heavy and difficult analysis: two definitions of the conic section, the standard equations and the geometric properties; the geometrical meanings of the characteristic parameters a, b, c, e, p and the relationship between them; the positional relationship between the straight line and the conic section Judgment and Application. Difficulties: Comprehensive use of the properties of conic curves, the positional relationship between straight and conic curves and related problems of string, the discussion of parameter problems, and the search of comprehensive problem solving methods. Conic curves