由于透影区域为 D:x2+y2≤4 xy 故选用柱坐标积分 6 v=ldv=sdef rdr faz Q 0 x6-r2-r)=32z 3 0 iaa]: Integrate[r, (v,0, 2Pi), r,0, 2), Z, r, 6-rA2)=32 Pi/3故选用柱坐标积分: 由于透影区域为 : 4 2 2 Dxy x + y    V = dv 3 32 2 (6 ) 2 0 2  =  − − =  r r r dr 语句: Integrate[r,{v,0,2Pi},{r,0,2},{z,r,6-r^2}=32 Pi/3    − =   2 0 2 0 6 2 r r d rdr dz