“点差法”是解决圆锥曲线问题的常见方法,如果使用恰当,可以减少计算量,优化解题过程.本文通过几道例题,谈谈“点差法”应用的三重境界.术:熟练应用,解决与中点和斜率相关的问题1.“点差法”的步骤直线与圆锥曲线相交于A,B两点,点A的坐标为(x1,y1),点B的坐标为(x2,y2),将A,B两点的坐标分别代入圆锥曲线的方程,两式作差后分解因式, “Spread method ” is a common method to solve the conic problem, if used properly, you can reduce the amount of computation, optimization problem solving process.This article through a few examples to talk about the Skilled application to solve the problems associated with the midpoint and slope 1. “Spread method ” steps The straight line and the conic intersect at A, B two points, the coordinates of point A (x1, y1), the coordinates of point B (x2, y2), the coordinates of the two points A, B were substituted into the conic curve equation, two for the difference factorization factor,