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解平面向量题除用到向量的有关知识外,还常用到一些方法和技巧,现举例说明.一、提取或分配例1设a是非零向量,且b≠c,求证a·b=a·c的充要条件是a⊥(b-c).
In addition to the knowledge about vectors used to solve vector problems, some methods and techniques are also commonly used. Here is an example to illustrate: 1. Extraction or allocation example 1 Let a be a non-zero vector and b≠c, verify a·b=a· The necessary and sufficient condition for c is a⊥(bc).