应该是x+2/x=a+2/a则x=a,x=2/a(x²-x+2)/(x-1)=a+2/(a-1)x(x-1)/(x-1)+2/(x-1)=a+2/(a-1)x+2/(x-1)=a+2/(a-1)两边减去1(x-1)+2/(x-1)=(a-1)+2/(a-1)所以x-1=a-1，x-1=2/(a-1)x=a,x=1+2/(a-1)即x=a,x=(a+1)/(a-1)
