在高中教材中,圆锥曲线作为解析几何的主要内容出现,借助坐标,用代数手段解决几何问题,目的是培养学生几何问题代数化的思想及处理数的能力.但当证明某些纯几何性质时,代数推导不免烦琐.圆锥曲线具有其特殊的几何性质,合理运用,可使问题大大简化.下面就2005年江西理科22题,根据 In the high school textbooks, conic curves appear as the main content of analytic geometry. With the aid of coordinates, algebraic methods are used to solve geometric problems. The purpose is to train students’ algebraic ideas of geometric problems and their ability to deal with numbers. But when some pure geometric properties are proved Algebraic derivation can not help but cumbersome. Conical curve has its special geometrical properties, and reasonable use can make the problem greatly simplified. The following on the 2005 science problems in Jiangxi Province, according to