练习 (2020,dfrac (2)(3)) 设四阶矩阵 =[ (a)_(i)] 不可逆,a12的代数余子式-|||-_(12)neq 0, α1,α2,α3,α4为矩阵A的列向量组,A`为A的伴随矩阵,则方程组-|||-'x=0 的通解为-|||-(A) =(k)_(1)(a)_(1)+(k)_(2)(a)_(2)+(k)_(3)(a)_(3), 其中k1,k2,k3为任意常数,-|||-(B) =(k)_(1)(a)_(1)+(k)_(2)(a)_(2)+(k)_(3)(a)_(4), 其中k1,k2,k3为任意常数.-|||-(C) =(k)_(1)(a)_(1)+(k)_(2)(a)_(3)+(k)_(3)(a)_(4), 其中k1,k2,k3为任意常数.-|||-(D) =(k)_(1)(a)_(2)+(k)_(2)(a)_(3)+(k)_(3)(a)_(4), 其中k1,k2,k3为任意常数,