(2m-n)²-(3m+2)²(7a-8b)²-4x²(x²+xy+y²)(x²-xy+y²)-(x²+y²)²1、2是因式分解

问题描述:

(2m-n)²-(3m+2)²
(7a-8b)²-4x²
(x²+xy+y²)(x²-xy+y²)-(x²+y²)²
1、2是因式分解

(2m-n)²-(3m+2)² =(2m-n+3m+2)(2m-n-3m-2)=(5m-n+2)(-m-n-2)=-(5m-n+2)(m+n+2)(7a-8b)²-4x²=(7a-8b+2x)(7a-8b-2x)(x²+xy+y²)(x²-xy+y²)-(x²+y²)²=(x&...