矩阵（021.-114.2-1-3）的逆矩阵怎么求?
问题描述：
矩阵（021.-114.2-1-3）的逆矩阵怎么求?
答
(A,E) =
0 2 1 1 0 0
-1 1 4 0 1 0
2 -1 -3 0 0 1
r3+2r2
r1-2r3,r2-r3
r1*(-1/9),r2*(-1)
r2-r1,r3-5r1
交换行
A^-1 =
1/9 5/9 7/9
5/9 -2/9 -1/9
-1/9 4/9 2/9