(a^n+b^n)(a^2n-a^n*b^n+b^2n)

问题描述:

(a^n+b^n)(a^2n-a^n*b^n+b^2n)

(a^n+b^n)(a^2n-a^n*b^n+b^2n)
=a^3n+b^3n拜托拜托,过程详细点