两边乘x(x-1)x(x-a)-3(x-1)=x(x-1)x²-ax-3x+3=x²-x(a+2)x=3若a=-2则a+2=0则0=3,不成立,无解若a≠-2则x=3/(a+2),无解则这是增根即公分母为0x(x-1)=0x=0,x=13/(a+2)=0不成立3/(a+2)=1a+2=3,a=1所以a=-2,a=1...