方-2a+1除以a+1分之a-1,其中a=根2.详解,
问题描述：
方-2a+1除以a+1分之a-1,其中a=根2.详解,
答
(a^2-2a+1)÷ (a-1)/(a+1)
=(a-1)^2÷ (a-1)/(a+1)
=(a-1)^2(a+1)÷ (a-1)
=(a-1)(a+1)
=a^2-1
=2-1
=1