增广矩阵= 1 2 1 1 1 1 2 4 3 1 1 2-1 -2 1 3 -3 5 0 0 2 4 -2 6用初等行变换化为行最简形1 2 0 0 2 -1 0 0 1 0 -1 1 0 0 0 1 0 1 0 0 0 0 0 0 一般解为: (-1,0,1,1,0)^T+k1(-2,1,0,0,0)^T+k2(-2,0,1,0,1)^T.