先化简再求值a^3(-b^3)^2+(-1/2ab^2)^3其中a=1/4,b=4

问题描述:

先化简再求值a^3(-b^3)^2+(-1/2ab^2)^3其中a=1/4,b=4

原式=a^3b^6-1/8a^3b^6
=7/8a^3b^6
=7/8×1/4³×4^6
=7/8×64
=56