(a1,a2,a3,a4)=
1 2 0 1
-1 1 3 3
3 1 5 2
5 2 -8 5
r2+r1,r3-3r1,r4-5r1
1 2 0 1
0 3 3 4
0 -5 5 -1
0 -8 -8 0
r4*(-1/8),r2-3r4,r3+5r4
1 2 0 1
0 0 0 4
0 0 10 -1
0 1 1 0
所以向量组的秩为4,极大无关组为向量组自身.
题没错吧