Posted by haifeng on 2015-08-31 16:52:51 last update 2015-08-31 16:52:51 | Answers (1) | 收藏
讨论三个平面
\[ \begin{aligned} \pi_1:\ A_1 x+B_1 y+C_1 z=D_1,\\ \pi_2:\ A_2 x+B_2 y+C_2 z=D_2,\\ \pi_3:\ A_3 x+B_3 y+C_3 z=D_3,\\ \end{aligned} \]
的位置关系, 画出图形, 并说明理由.
