2)(a-b)²+4ab
问题描述:
2)(a-b)²+4ab
答
(a-b)²+4ab
=a²-2ab+b²+4ab
=a²+2ab+b²
=(a+b)²
2)(a-b)²+4ab
(a-b)²+4ab
=a²-2ab+b²+4ab
=a²+2ab+b²
=(a+b)²