(2^2)^3-6a^3(a^3+2a^2+a)=?

问题描述:

(2^2)^3-6a^3(a^3+2a^2+a)=?

[2a^2]^3-6a^3[a^3+2a^2+a]
=8a^6-6a^6-12a^5-6a^4
=2a^6-12a^5-6a^4