增广矩阵 (A,b)=
1 2 -2 1 -1
-1 -3 2 3 4
r2+r1
1 2 -2 1 -1
0 -1 0 4 3
r1+2r2,r2*(-1)
1 0 -2 9 5
0 1 0 -4 -3
所以方程组的通解为 (5,-3,0,0)^T+c1(2,0,1,0)^T+c2(-9,4,0,1)^T
增广矩阵 (A,b)=
1 2 -2 1 -1
-1 -3 2 3 4
r2+r1
1 2 -2 1 -1
0 -1 0 4 3
r1+2r2,r2*(-1)
1 0 -2 9 5
0 1 0 -4 -3
所以方程组的通解为 (5,-3,0,0)^T+c1(2,0,1,0)^T+c2(-9,4,0,1)^T