14.用行列式的性质证明:-|||-a1 b1 C1-|||-(1) |} (a)_(1)+k(b)_(1)& (b)_(1)+(c)_(1) (a)_(2)+k(b)_(2)& (b)_(2)+(c)_(2) (a)_(3)+k(b)_(3)& (b)_(3)+(c)_(3) . C1 C2 C3 = a2 b2 C2-|||-a3 b3 C3-|||-a1 b1 C1-|||-(2) |} (b)_(1)+(c)_(1)& (c)_(1)+(a)_(1) (b)_(2)+(c)_(2)& (c)_(2)+(a)_(2) (b)_(3)+(c)_(3)& (c)_(3)+(a)_(3)_{4 .-|||-an-bn