A= (a1,a2,a3; b1,b2,b3;c1,c2,c3)可逆说明AX=0仅有0解即 a1x1+a2x2+a3-3=0;b1x1+b2x2+b3x_3=0;c1x1+c2x2+c3x_3=0只有0解如果a1x1+a2x2=a3;b1x1+b2x2=b3;c1x1+c2x2=c3有解,则等价于 a1x1+a2x2+a3x_3=0;b1x1+b2x2+b3x_3=0;c1x1+c2x2+c3x_3=0有一组非0解(x1,x2,-1)矛盾所以答案是C