10: 380mm=3.8dm 266mm=2.66dm 530mm=5.3dm 体积 3.8×2.66×5.3 =53.5724 ≈53.57 表面积 ﹙3.8×2.66+3.8×5.3+2.66×5.3﹚×2 =﹙10.108+20.14+14.098﹚×2 =44.346×2 =88.692 ≈88.69 11: ① 20÷2=10 3.14×10 =3.14×100 =314 ② 3.14×20×2+314 =125.6+314 =439.6 ③ 314×2×1 =628 12: | 规格① | 规格② | 规格③ | 规格④ | 容积/立方米 | 选法一 | 3 | | | 2 | 0.096 | 选法二 | | 3 | | 2 | 0.08 | 选法三 | | | | 6 | 0.064 | 选法四 | 2 | | 2 | 2 | 0.12 |
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13: 略
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