解: 增广矩阵=
1 1 1 1 3
3 4 1 -1 14
5 6 3 1 20
r3-2r1-r3, r2-3r1
1 1 1 1 3
0 1 -2 -4 5
0 0 0 0 0
r1-r2
1 0 3 5 -2
0 1 -2 -4 5
0 0 0 0 0
方程组的全部解为: (-2,5,0,0)^T+c1(-3,2,1,0)^T+c2(-5,4,0,1)^T.
解: 增广矩阵=
1 1 1 1 3
3 4 1 -1 14
5 6 3 1 20
r3-2r1-r3, r2-3r1
1 1 1 1 3
0 1 -2 -4 5
0 0 0 0 0
r1-r2
1 0 3 5 -2
0 1 -2 -4 5
0 0 0 0 0
方程组的全部解为: (-2,5,0,0)^T+c1(-3,2,1,0)^T+c2(-5,4,0,1)^T.