(X-A)/(X-1)-3/X=1两边乘x(x-1)x(x-a)-3(x-1)=x(x-1)x²-ax-3x+3=x²-x(a+2)x=3a=-2,a+2=0等式不成立无解a≠-2x=3/(a+2)此时是增根,即分母为0所以x=0,x=13/(a+2)=0不成立3/(a+2)=1a+2=3a=1所以a=-2,a=1...