(1)秩为4
(2)行列式的值为:12568
(3)A的逆为:
274/1571 -381/12568 -157/12568 122/4523
-165/1571 124/1571 -19/1571 1/1571
13/1571 217/12568 212/2327 -391/12568
15/1571 -233/12568 -129/12568 484/6089