人教版高中数学新教材第二册 (下Ｂ)综合运用几何推理和向量运算的方法研究立体几何问题 .用向量方法处理立体几何问题在某些方面较几何推理方便、简洁 .下面就举例谈谈用共面向量定理在处理关于共面问题上的优越性 .为方便起见 ,我们先介绍一下共面向量定理及其一个推论 .共面 The second edition (bottom B) of the PEP High School Mathematics New Textbook is a comprehensive study of geometric problems using geometric reasoning and vector operations. The use of vector methods to deal with solid geometry problems is easier and more concise than geometric reasoning in some aspects. Discuss the superiority of coplanar vector theorem in dealing with coplanar problems. For convenience, we first introduce the coplanar vector theorem and a corollary.