两个非零向量a和b,它们的夹角是θ,则把数量|a||b|cosθ叫做向量a和b的数量积或内积.在学习向量积的问题中具有较高的综合性和灵活性,该文主要论述几个综合提升问题,从而培养学生思维灵活分析能力. Two non-zero vectors a and b whose angles are θ, then the number |a||b|cosθ is called the scalar product or the inner product of the vectors a and b. It has a higher integration in the problem of the learning vector product. Sexuality and flexibility, this article mainly discusses several comprehensive promotion problems, so as to train students’ thinking and flexible analysis ability.