系数矩阵 =
1 1 0 -3 -1
1 -1 2 -1 0
4 -2 6 3 -4
3 3 0 3 -7
r2-r1,r3-4r1,r4-3r1
1 1 0 -3 -1
0 -2 2 2 1
0 -6 6 15 0
0 0 0 12 -4
r4*(1/12),r1+3r4,r2-2r4,r3-15r4
1 1 0 0 -2
0 -2 2 0 5/3
0 -6 6 0 5
0 0 0 1 -1/3
r3-3r2,r2*(-1/2),r1-r2
1 0 1 0 -7/6
0 1 -1 0 -5/6
0 0 0 0 0
0 0 0 1 -2/6
全部解为:c1(1,-1,-1,0,0)'+c2(7,5,0,2,6)'