表面积2.5×2.5×2+（2.5+2.5）×2.5×4＝12.5cm²+5×2.5×4＝12.5cm²＋50cm²＝62.5cm²体积2.5×2.5×（2.5+2.5）＝2.5×2.5×5＝31.25cm³
