一道约分题

问题描述:

一道约分题
(a-a^2-1)^2÷(a^2-a+1)要过程

(a-a^2-1)^2÷(a^2-a+1)
=[-(a^2-a+1)]^2÷(a^2-a+1)
=(a^2-a+1)^2÷(a^2-a+1)
=a^2-a+1