大学线性代数题，求帮助一下，谢谢！ 5
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A =
2 0 -4 -1
3 6 1 1
3 -13 12 -1
2 3 3 1
=
2 0 -4 -1
1 6 5 2
1 -13 16 0
0 3 7 2
=
1 6 5 2
2 0 -4 -1
1 -13 16 0
0 3 7 2
A =
1 6 5 2
0 -12 -14 -5
0 -19 11 -2
0 3 7 2
A =
1 6 5 2
0 -12 -14 -5
0 -1 53 10
0 3 7 2
A =
1 6 5 2
0 -1 53 10
0 -12 -14 -5
0 3 7 2
A =
1 6 5 2
0 -1 53 10
0 0 14 3
0 0 12 -1
A =
1 6 5 2
0 -1 53 10
0 0 2 4
0 0 12 -1
A =
1 6 5 2
0 -1 53 10
0 0 2 4
0 0 0 -25
=50
2 0 -4 -1
3 6 1 1
3 -13 12 -1
2 3 3 1
=
2 0 -4 -1
1 6 5 2
1 -13 16 0
0 3 7 2
=
1 6 5 2
2 0 -4 -1
1 -13 16 0
0 3 7 2
A =
1 6 5 2
0 -12 -14 -5
0 -19 11 -2
0 3 7 2
A =
1 6 5 2
0 -12 -14 -5
0 -1 53 10
0 3 7 2
A =
1 6 5 2
0 -1 53 10
0 -12 -14 -5
0 3 7 2
A =
1 6 5 2
0 -1 53 10
0 0 14 3
0 0 12 -1
A =
1 6 5 2
0 -1 53 10
0 0 2 4
0 0 12 -1
A =
1 6 5 2
0 -1 53 10
0 0 2 4
0 0 0 -25
=50
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