Posted by haifeng on 2015-08-23 23:39:22 last update 2015-08-23 23:39:22 | Answers (1) | 收藏
已知四点 $A=(1,2,7)$, $B=(4,3,3)$, $C=(5,-1,6)$, $D=(\sqrt{7},\sqrt{7},0)$. 试求过这四点的球面方程.
