(aa-bb)(aa-bb)/(a-b)(a-b)
问题描述:
(aa-bb)(aa-bb)/(a-b)(a-b)
答
(aa-bb)(aa-bb)/(a-b)(a-b)
=(a²-b²)²/(a-b)²
=[(a-b)(a+b)]²/(a-b)²
=(a+b)²