
线性代数 就这三道题答案
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(1)
A =
1 0 2 -1
2 0 3 1
3 0 4 -3
=
1 0 2 -1
0 0 -1 3
0 0 -2 0
=
1 0 2 -1
0 0 -1 3
0 0 0 -6
(2)
A =
1 -1 2
3 2 1
1 -2 0
=
1 -1 2
0 5 -5
0 -1 -2
=
1 -1 2
0 -1 -2
0 5 -5
=
1 -1 2
0 -1 -2
0 0 -15
(3)
A =
1 -1 3 -4 3
3 -3 5 -4 1
2 -2 3 -2 0
3 -3 4 -2 -1
=
1 -1 3 -4 3
0 0 -4 8 -8
0 0 -3 6 -6
0 0 -5 10 -10
=
1 -1 3 -4 3
0 0 1 -2 2
0 0 -3 6 -6
0 0 -5 10 -10
=
1 -1 3 -4 3
0 0 1 -2 2
0 0 0 0 0
0 0 0 0 0
A =
1 0 2 -1
2 0 3 1
3 0 4 -3
=
1 0 2 -1
0 0 -1 3
0 0 -2 0
=
1 0 2 -1
0 0 -1 3
0 0 0 -6
(2)
A =
1 -1 2
3 2 1
1 -2 0
=
1 -1 2
0 5 -5
0 -1 -2
=
1 -1 2
0 -1 -2
0 5 -5
=
1 -1 2
0 -1 -2
0 0 -15
(3)
A =
1 -1 3 -4 3
3 -3 5 -4 1
2 -2 3 -2 0
3 -3 4 -2 -1
=
1 -1 3 -4 3
0 0 -4 8 -8
0 0 -3 6 -6
0 0 -5 10 -10
=
1 -1 3 -4 3
0 0 1 -2 2
0 0 -3 6 -6
0 0 -5 10 -10
=
1 -1 3 -4 3
0 0 1 -2 2
0 0 0 0 0
0 0 0 0 0
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