令x/(x-1)=a则(2x-2)/x=2/aa-2/a-1=0a²-a-2=(a-2)(a+1)=0a=2,a=-1x/(x-1)=2x=2x-2x=2x/(x-1)=-1x=-x-1x=-1/2所以x=2,x=-1/2
-2x=3 x=-2分之3
x=3或-1
