先化简再求值a^3(-b^3)+(-1/2ab^2)^3,其中a=1/4,b=4
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![先化简再求值a^3(-b^3)+(-1/2ab^2)^3,其中a=1/4,b=4](/uploads/image/z/5434869-21-9.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BCa%5E3%28-b%5E3%29%2B%28-1%2F2ab%5E2%29%5E3%2C%E5%85%B6%E4%B8%ADa%3D1%2F4%2Cb%3D4)
先化简再求值a^3(-b^3)+(-1/2ab^2)^3,其中a=1/4,b=4
先化简再求值a^3(-b^3)+(-1/2ab^2)^3,其中a=1/4,b=4
先化简再求值a^3(-b^3)+(-1/2ab^2)^3,其中a=1/4,b=4
a^3(-b^3)^2+(-1/2ab^2)^3,其中a=1/4,b=4
=a^3b^6-1/8a^3b^6
=7/8a^3b^3*b^3
=7/8(ab)^3*b^3
=7/8*1*64
=56
a^3(-b^3)^2+(-1/2ab^2)^3=7/8a^3b^6
值为7/8*4^3=56
a^3(-b^3)+(-1/2ab^2)^3=-a^3b^3-1/8a^3b^6=a^3b^3(-1-1/8b^2)带入数据得(1/4)^3*4^3[-1-1/8*(4)^2]=-3