(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x

问题描述:

(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)
-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x