(α1,α2,α3,α4) =
-2 1 3 0
1 -3 0 -1
0 2 2 4
3 4 -1 9
r4+r1-r2,r1+2r2,r3*(1/2)
0 -5 3 -2
1 -3 0 -1
0 1 1 2
0 8 2 10
r1+5r3,r2+3r3,r4-8r3
0 0 8 8
1 0 3 5
0 1 1 2
0 0 -6 -6
r4*(-1/6),r1-8r4,r2-3r4,r3-r4
0 0 0 0
1 0 0 2
0 1 0 1
0 0 1 1
α4是α1,α2,α3的线性组合
且有 α4=2α1+α2+α3.