几行几列的?
我按4行5列解答了
r2-2r1,r3-3r1,r4-2r1
1 -1 2 1 0
0 0 0 -4 0
0 3 0 -4 1
0 3 0 0 1
r3-r4
1 -1 2 1 0
0 0 0 -4 0
0 0 0 -4 0
0 3 0 0 1
r3-r2
1 -1 2 1 0
0 0 0 -4 0
0 0 0 0 0
0 3 0 0 1
交换行得
1 -1 2 1 0
0 3 0 0 1
0 0 0 -4 0
0 0 0 0 0
矩阵的秩为3.
几行几列的?
我按4行5列解答了
r2-2r1,r3-3r1,r4-2r1
1 -1 2 1 0
0 0 0 -4 0
0 3 0 -4 1
0 3 0 0 1
r3-r4
1 -1 2 1 0
0 0 0 -4 0
0 0 0 -4 0
0 3 0 0 1
r3-r2
1 -1 2 1 0
0 0 0 -4 0
0 0 0 0 0
0 3 0 0 1
交换行得
1 -1 2 1 0
0 3 0 0 1
0 0 0 -4 0
0 0 0 0 0
矩阵的秩为3.