(x-1分之x平方-1-x分之2x)除以x-1分之x,其中x=根号3+1
=[x²/(x-1)+2x/(x-1)]÷x/(x-1)
=x(x+2)/(x-1)*(x-1)/x
=x+2 其中x=根号3+1
=√3+1+2
=3+√3