1、18(π×2×2×X×X+π×3×3×X×X)=65018π×13×X×X=650X×X＝25/9π甲圆柱的体积是18π×2×2×25/9π=2002、38000/(1+(1-1/5)/(1+1/10))=38000/(19/11)=22000
