(m+5n)^2-2(5n+m)(n-3m)+(3m-n)^2

分类: 作业答案 • 2021-12-24 15:31:36

问题描述：

答

(m+5n)^2-2(5n+m)(n-3m)+(3m-n)^2
=(m+5n)^2-2(m+5n)(n-3m)+(n-3m)^2
=[(m+5n)-(n-3m)]^2
=(4m+4n)^2
=16(m-n)^2