解: 构造分块矩阵(上下两块)
A
B
11 -1
022
1 -10
-------
1 -10
110
211
c2-c1,c3+c1
100
022
1 -21
1 -21
101
2 -13
c3-c2
100
020
1 -23
1 -23
101
2 -14
c2*(1/2),c3*(1/3)
10 0
01 0
1 -1 1
1 -1 1
10 1/3
2 -1/2 4/3
c1-c3,c2+c3
10 0
01 0
00 1
----------
00 1
2/3 1/3 1/3
2/3 5/6 4/3
所以 X=
00 1
2/3 1/3 1/3
2/3 5/6 4/3
满意请采纳^_^