a1 a2-|||-若三阶行列式 |} 2(a)_(1)& 3(a)_(1)-(a)_(2)& (a)_(3) 2(b)_(1)& 3(b)_(1)-(b)_(2)& (b)_(3) 2(a)_(1)& 3(a)_(1)-(c)_(2)& (c)_ . =-1,则 |b1 b2 } (a)_(3) (b)_(3) (c)_(3) | . = __-|||-c1 C2