我们知道,距离问题是立体几何中的一个重难点,特别是两条异面直线间的距离,由于其公垂线不易作出,故使其求法难上加难.本文用向量的方法给出空间距离的统一公式,使这一问题迎刃而解.公式d=AB·e.分以下三种情况证明.(1)图1中A、B分别表示直线l外一点和l上一点,e表示和AO平行的 We know that the distance problem is a difficult and difficult point in the three-dimensional geometry, especially the distance between two different straight lines. Because its vertical line is not easy to make, it makes it harder to find a solution. This paper gives a space using the vector method. The unified formula of distance makes this problem easily solved. The formula d=AB·e. is divided into the following three cases to prove. (1) In Figure 1, A and B represent the point outside the line l and the point above l, and e represents the parallel with AO. of