x^3乘以(-y^3)^2+(1/2xy^2)^3其中x=1/4,y=4先化简再求值
问题描述:
x^3乘以(-y^3)^2+(1/2xy^2)^3其中x=1/4,y=4先化简再求值
答
x^3*(-y^3)^2+(1/2xy^2)^3=(xy^2)^3+(1/2*xy^2)^3=9/8(xy^2)^3=(9/8)*(1/4*16)^3=(9/8)*64=72