Posted by haifeng on 2014-06-08 15:07:53 last update 2014-06-08 15:07:53 | Answers (2) | 收藏
设这三条直线是
$L_1:\ x=y=z$
$L_2:\ x-1=y=z+1$
$L_3:\ x=y+1=z-1$
求过这三条平行直线的圆柱面方程.
