(-2ab^2)^2·(3a^2b-2ab-4b^3)

问题描述:

(-2ab^2)^2·(3a^2b-2ab-4b^3)

原式=(4a²b^4)(3a²b-2ab-4b³)
=12a^4n^5-8a³b^5-16a²b^7