x/3(3-x)
分子分母同乘以(-1)
=-x/3(x-3)
所以-x/3(x-3)+2/(x-1)(x-3)+1/（x-1）=1
两边乘3(x-3)(x-1)
-x(x-1)+6+3(x-3)=3(x-3)(x-1)
x²-4x+3=0
(x-1)(x-3)=0
即公分母为0,不成立
所以方程无解