在近年的高考题中,以三角形内角平分线为条件的题目常有出现,受到命题者的情睐。而且常考常新,融入到许多知识点中,用该性质解题可起到事半功倍的效果。三角形内角平分线性质定理:△ABC中,D是BC上的点,若AD平分∠BAC,则AB-AC=BD-DC。下面就三角形内角平分线性质在几个知识模块的应用做一分析。一、向量中的应用(2010年大纲全国卷2)△ABC中,点D在AB上, In recent years, college entrance examination questions, the triangular angle bisector conditions are often the subject of the subject, by the prophet’s favor. And often test new, into many points of knowledge, with the nature of the problem-solving can play a multiplier effect. Triangle of triangle internal angle nature of the theorem: △ ABC, D is the point on BC, if AD bisects ∠ BAC, AB-AC = BD-DC. The following triangle bisector of the nature of bisector in the application of several knowledge modules to do an analysis. First, the vector application (Outline 2010 National Volume 2) △ ABC, the point D on the AB,