增广矩阵 =
1 -5 2 -3 11
5 3 6 -1 -1
2 4 2 1 -6
r2-5r1, r3-2r1
1 -5 2 -3 11
0 28 -4 14 -56
0 14 -2 7 -28
r2-2r3, r3*(1/14)
1 -5 2 -3 11
0 0 0 0 0
0 1 -1/7 1/2 -2
r1+5r3
1 0 9/7 -1/2 1
0 0 0 0 0
0 1 -1/7 1/2 -2
所以通解为: (1,-2,0,0)'+c1(-9,1,7,0)'+c2(1,-1,0,2), c1,c2 为任意常数.
满意请采纳^_^.