线性代数题!求详细过程。谢谢!
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[A|E] =
1 2 3 1 0 0
2 2 1 0 1 0
3 4 3 0 0 1
=
1 2 3 1 0 0
0 -2 -5 -2 1 0
0 -2 -6 -3 0 1
=
1 2 3 1 0 0
0 -2 -5 -2 1 0
0 0 1 1 1 -1
=
1 2 0 -2 -3 3
0 -2 0 3 6 -5
0 0 1 1 1 -1
=
1 2 0 -2 -3 3
0 1 0 -3/2 -3 5/2
0 0 1 1 1 -1
=
1 0 0 1 3 -2
0 1 0 -3/2 -3 5/2
0 0 1 1 1 -1
A^(-1) =
1 3 -2
-3/2 -3 5/2
1 1 -1
1 2 3 1 0 0
2 2 1 0 1 0
3 4 3 0 0 1
=
1 2 3 1 0 0
0 -2 -5 -2 1 0
0 -2 -6 -3 0 1
=
1 2 3 1 0 0
0 -2 -5 -2 1 0
0 0 1 1 1 -1
=
1 2 0 -2 -3 3
0 -2 0 3 6 -5
0 0 1 1 1 -1
=
1 2 0 -2 -3 3
0 1 0 -3/2 -3 5/2
0 0 1 1 1 -1
=
1 0 0 1 3 -2
0 1 0 -3/2 -3 5/2
0 0 1 1 1 -1
A^(-1) =
1 3 -2
-3/2 -3 5/2
1 1 -1
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