I=11-12 fJ6x2+y2xdxdydz-[e2+y2)dxdy dz, 王4C间上,h= 1 2 frdrdef fiz=J 2π 2 d0d2r·r2=2π 2 6 D 原式I= 4525 3尤-二兀=336兀 上页( ) ( ) , 1 2 2 2 2 2 1 2     = + − +  = − x y dxdydz x y dxdydz I I I   =  1 2 8 2 1 D I rdrd r fdz , 3 4 5 =    =  2 2 2 2 2 D I rdrd r fdz , 6 2 5 =  原式I =  3 4 5 −  6 2 5 = 336 .    =    8 2 4 0 2 0 2 2 r d dr r r dz    =    2 2 2 0 2 0 2 2 r d dr r r dz