向量法求解立体几何问题是高中数学的一个重要内容.在这部分的学习中,同学们经常会碰到一类探究在某条线段(或某条棱)上是否存在点P,使得某个结论成立的试题.解答该类试题的常用方法往往较为复杂,计算量偏大,不够简捷,而借助定比分点公式的坐标式可迅速求出点P的坐标.不仅如此,借助定比分点公式的向量式甚至可以避免求点P The vector method to solve the problem of solid geometry is an important part of high school mathematics.In this part of the study, students often encounter a class to explore whether there is a point in a line segment (or a point), so that a conclusion Established the test questions. Answer commonly used methods of such questions are often more complicated, the amount of calculation is too large, not simple enough, but with the coordinate point formula formula can be quickly find the coordinates of point P. Not only that, with the help of formula Vector type can even avoid seeking point P