(-4a^3+12a^3b^3)(-4a^2)

问题描述:

(-4a^3+12a^3b^3)(-4a^2)

(-4a^3+12a^3b^3)(-4a^2)
=-4a^3×(-4a^2)+12a^3b^3 ×(-4a^2)
=16a^5-48a^5b^3