有底:4.2×3.8×2=31.92m4.2×2×2=16.8m3.8×2×2=15.2m31.92+16.8+15.2=63.92m无底:4.2×3.8=15.96m4.2×2×2=16.8m3.8×2×2=15.2m15.96+16.8+15.2=47.96m
