向前冲NO.1 发表于 2013-7-11 13:39 " _% |8 g |- G0 r2 K: e L 用两点间距离公式啊,(x-x')^2+(y-y')^2=d(平面上);(x-x')^2+(y-y')^2+(z-z')^2=d(立体的)