∫∫Σ x³dydz + y³dzdx + z³dxdy
= 3∫∫∫Ω (x² + y² + z²) dv
= 3∫(0,2π) dθ ∫(0,π) sinφdφ ∫(0,a) r⁴ dr
= (3)(2π)(2)(a⁵/5)
= (12/5)πa⁵
∫∫Σ x³dydz + y³dzdx + z³dxdy
= 3∫∫∫Ω (x² + y² + z²) dv
= 3∫(0,2π) dθ ∫(0,π) sinφdφ ∫(0,a) r⁴ dr
= (3)(2π)(2)(a⁵/5)
= (12/5)πa⁵