Question

化简并求值(1-2a+a²)/(a-1)-√(a²-2a+1)/(a²-a)其中a=1/(2+√3)

本问题已不需要解答······

Answer 1

a=1/(2+根号3)
a=2-根号3

=(a-1)^2/(a-1)-(a-1)/a(a-1)
=a+1-1/a
=2-根号3+1-1/(2-根号3)
=3-根号3-2-根号3
=1-2根号3

我是手机答的，采纳吧！