[(2m+n) (2m-n)]^2

问题描述:

[(2m+n) (2m-n)]^2

[(2m+n) (2m-n)]^2
= (4m² - n ²)²
= (4m ²)² - 8m²n² + (n²)²
= 16m 四次方 - 8m²n² + n 四次方