数乘向量是平面向量的重要内容之一,运用“a=λb”解决相关数学问题能起到化繁为简、事半功倍的功效,它在解高考解几试题中的运用就是一个很好的例证. The number-multiply vector is one of the important contents of the plane vector. Using “a=λb” to solve the related mathematics problem can achieve the effect of simplifying and simplifying it. It is a good example of its application in solving several questions in the college entrance examination. .