若关于x的分式方程(x-a)/(x-1) -3/x=1无解,则a=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,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

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