m(3n-m)平方-3n(3n-m)平方+m-3n
问题描述:
m(3n-m)平方-3n(3n-m)平方+m-3n
答
m(3n-m)^2-3n(3n-m)^2+m-3n
=m(m-3n)^2-3n(m-3n)^2+(m-3n)
=(m-3n)^2(m-3n)+(m-3n)
=(m-3n)[(m-3n)^2+1]