先化简,再求值:a3(-b3)2+(-1/2ab2)3,其中a=0.25,b=4

问题描述:

先化简,再求值:a3(-b3)2+(-1/2ab2)3,其中a=0.25,b=4

原式=a3b6-1/8a3b6
=7/8a3b6
=7/8×(ab)3b3
=7/8×(0.25×4)3×4的立方
=7/8×1×64
=56