平面向量为高中教材必修四的内容,它是沟通代数和几何的桥梁之一,它的优越性在于不依赖于原点,比坐标系更加普遍.它可以是代数对象,可以进行加减、数乘、数量积、矢量积等运算;它也可以使几何对象,可以求长度、角度等.对它的研究主要是为了以后空间向量的学习做准备.它是一个相对标量的一个既有方向又有大小的量,是研究一些问题的工具,在现实生活中有很大的应用.例如对物体的受力分析,速度的合成,计 Plane vector for high school textbooks compulsory four content, it is a bridge between algebra and geometry communication, its superiority is not dependent on the origin, more common than the coordinate system. It can be an algebra object, you can add and subtract, multiply by , The number of product, vector product and other operations; it can also make geometric objects, you can seek length, angle, etc. Its research is mainly for future space vector learning to prepare it is a relative scalar of an existing direction and The amount of size, is a tool to study some problems, has great applications in real life. For example, the force analysis of the object, the speed of the synthesis, the total