论文部分内容阅读
新教材引入向量后,定比分点坐标公式的推导变得更为简单、易懂,但定比的求法及公式的应用并没有降低难度.本文试介绍几种常用的方法以求帮助学生解决一些疑问.一、关于定比λ的三种求法(1)定义法设p分向量p1p2.成定比λ,则有|λ|=|p.1p||pp2.|.当p为内分点时,λ0;当p为
After the introduction of vector in the new textbook, the derivation of the coordinate formula of the fixed-point coordinates has become simpler and easier to understand, but the application of the method and the formula of the fixed ratio has not reduced the difficulty. This article introduces several commonly used methods to help students solve some problems. Question. I. Three methods for determining the ratio λ (1) The definition method Let p divide the vector p1p2. To determine the ratio λ, then there is |λ|=|p.1p||pp2.|. When p is the inner point When, λ0; when p is