系数矩阵 =
1 1 -3 -1
3 -1 -3 4
1 5 -9 -8
r2-3r1,r3-r1
1 1 -3 -1
0 -4 6 7
0 4 -6 -7
r3+r2
1 1 -3 -1
0 -4 6 7
0 0 0 0
r2*(-1/4)
1 1 -3 -1
0 1 -3/2 -7/4
0 0 0 0 0
r1-r2
1 0 -3/2 3/4
0 1 -3/2 -7/4
0 0 0 0
通解为:c1(3,3,-2,0)^T + c2(3,-7,0,-4)^T,c1,c2为任意常数.
线性代数,x1+x2-3x3-x4=0 3x1-x2-3x3+4x4=0 x1+5x2-9x3-8x4=0
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