(3m+3n)^2乘(2m-3n)^2过程
问题描述:
(3m+3n)^2乘(2m-3n)^2过程
答
原式=[(3m+3n)(2m-3n)]^2
=(6m^2-3mn-9n^2)^2
=36m^4+9m^2n^2+81n^4-36m^3n-108m^2n^2+54mn^3
=36m^4+81n^4-36m^3n-99m^2n^2+54mn^3