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A =
1 -2 -1 0 2
-2 4 2 6 -6
2 -1 0 2 3
3 3 3 3 4
=
1 -2 -1 0 2
0 0 0 6 -2
0 3 2 2 -1
0 9 6 3 -2
=
1 -2 -1 0 2
0 0 0 6 -2
0 3 2 2 -1
0 0 0 -3 1
=
1 -2 -1 0 2
0 3 2 2 -1
0 0 0 -3 1
0 0 0 6 -2
=
1 -2 -1 0 2
0 3 2 2 -1
0 0 0 -3 1
0 0 0 0 0
所以R(A) = 3
1 -2 -1 0 2
-2 4 2 6 -6
2 -1 0 2 3
3 3 3 3 4
=
1 -2 -1 0 2
0 0 0 6 -2
0 3 2 2 -1
0 9 6 3 -2
=
1 -2 -1 0 2
0 0 0 6 -2
0 3 2 2 -1
0 0 0 -3 1
=
1 -2 -1 0 2
0 3 2 2 -1
0 0 0 -3 1
0 0 0 6 -2
=
1 -2 -1 0 2
0 3 2 2 -1
0 0 0 -3 1
0 0 0 0 0
所以R(A) = 3
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