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水桶的側面積:3.14×1.8×6×2=67.824(平方分米),水桶的底面積:3.14×1.82=3.14×3.24=10.1736(平方分米),水桶的表面積:67.824+10.1736≈80(平方分米);答:做一個這樣的水桶大約用鐵皮80平方分米.
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