mnmm
ij
n
n
ccc
c
ccc
ccc
21
22221
11211
rj
j
j
irii
b
b
b
aaa
2
1
21
01
00
11
010
101
AB?
00
10
010
101
01
00
11
BA
101
000
111
例 1
例 2
321
3
2
1
bbb
a
a
a
332313
322212
312111
bababa
bababa
bababa
3
2
1
321
a
a
a
bbb
332211 bababa
例 3
00 1000 01 00 10
00 0100 10 00 00
例 4
mnmnmm
nn
nn
bxaxaxa
bxaxaxa
bxaxaxa
2211
22222121
11212111
mnmnmm
n
n
b
b
b
b
x
x
x
x
aaa
aaa
aaa
A
2
1
2
1
21
22221
11211
,,令
bAx?则方程组可写作
