13
1 2 1 1 2 1 1 1 2 3 1 1 6 9 7 3
4 2 B 1 2 9 1 0 0 0 1 0 0 0 1 2 1 1 1 1 0 0 2 0 0 1 0 1 0 1 1 0 0 0 0 1 0 0 4 0 B 3 6 3 4 3 B 5 3 0
4 r2 2 0 2 2 2 0 r3 2r1 B r3 5r2 2 0 5 5 3 6 r4 3r1 r4 3r2 0 3 3 4 3 1 1 2 1 4 r3 r4 0 1 1 1 0 r1 r2 B 4 0 0 0 1 3 r4 2r3 r2 r3 0 0 0 0 0 矩阵 B4 和 B5 都称为行阶梯形矩阵.
r2 r3 1
1 2
1