∫∫∫(D)xyzdV = ∫[0,2]xdx*∫[0,2]ydy*∫[0,2]zdz
= {∫[0,2]xdx}^3
= {(1/2)(x^2)|[0,2]}^3
= {(1/2)(2^2)}^3
= 2^3
= 8