可先求两个平行平面,分别过一条直线且平行于另一条直线,其法向量用两直线方向向量的叉积求得,点为所过直线上的点,即法向量为{1,1,-1},点分别为(1,0,1)和(0,-1,2),两平面方程分别为x+y-z=0和x+y-z+3=0,然后求得这两个平行平面的距离为3开方,即根号3.
x-1/1=y/1=z-1/2 和x/1=y+1/3=z-2/4之间的距离
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