3个回答
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-1 2 -2 1
2 3 1 -1
2 0 0 3
4 1 0 1
=
(4)-(3)×2
(2)-(3)
(3)+(1)×2
-1 2 -2 1
0 3 1 -4
0 4 -4 5
0 1 0 -5
=
(2)<->(4),(1)×(-1)
1 -2 2 -1
0 1 0 -5
0 4 -4 5
0 3 1 -4
=
(3)-(2)×4;(4)-(2)×3
1 -2 2 -1
0 1 0 -5
0 0 -4 25
0 0 1 11
=
(3)<->(4);(4)×(-1)
1 -2 2 -1
0 1 0 -5
0 0 1 11
0 0 4 -25
=
(4)-(3)×4
1 -2 2 -1
0 1 0 -5
0 0 1 11
0 0 0 -69
=-69
2 3 1 -1
2 0 0 3
4 1 0 1
=
(4)-(3)×2
(2)-(3)
(3)+(1)×2
-1 2 -2 1
0 3 1 -4
0 4 -4 5
0 1 0 -5
=
(2)<->(4),(1)×(-1)
1 -2 2 -1
0 1 0 -5
0 4 -4 5
0 3 1 -4
=
(3)-(2)×4;(4)-(2)×3
1 -2 2 -1
0 1 0 -5
0 0 -4 25
0 0 1 11
=
(3)<->(4);(4)×(-1)
1 -2 2 -1
0 1 0 -5
0 0 1 11
0 0 4 -25
=
(4)-(3)×4
1 -2 2 -1
0 1 0 -5
0 0 1 11
0 0 0 -69
=-69
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