(m²+n²)²-4m²n²因式分解

(m²+n²)²-4m²n²因式分解
(m²+n²)²-4m²n²因式分解

(m²+n²)²-4m²n²因式分解
原式=m^4+2m²n²+n^4-4m²n²
=m^4-2m²n²+n^4
=(m²-n²)²

(a+1)²(2a-3)-2(a+1)(3-2a)+2a-3=(2a-3)【(a+1)²+2(a+1)+1】
=(2a-3)【(a+1）+1】²=（2a-3)（a+2）²

(m+n)²(m-n)²