利用矩阵的初等行变换将下列矩阵化为行阶梯形
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A =
2 -1 2 1 1
1 1 -1 0 2
2 5 -4 -2 9
3 3 -1 -1 8
A =
1 1 -1 0 2
2 -1 2 1 1
2 5 -4 -2 9
3 3 -1 -1 8
A =
1 1 -1 0 2
0 -3 4 1 -3
0 3 -2 -2 5
0 0 2 -1 2
A =
1 1 -1 0 2
0 -3 4 1 -3
0 0 2 -1 2
0 0 2 -1 2
A =
1 1 -1 0 2
0 -3 4 1 -3
0 0 2 -1 2
0 0 0 0 0
2 -1 2 1 1
1 1 -1 0 2
2 5 -4 -2 9
3 3 -1 -1 8
A =
1 1 -1 0 2
2 -1 2 1 1
2 5 -4 -2 9
3 3 -1 -1 8
A =
1 1 -1 0 2
0 -3 4 1 -3
0 3 -2 -2 5
0 0 2 -1 2
A =
1 1 -1 0 2
0 -3 4 1 -3
0 0 2 -1 2
0 0 2 -1 2
A =
1 1 -1 0 2
0 -3 4 1 -3
0 0 2 -1 2
0 0 0 0 0
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