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需要這樣的水泥磚:40x8/(0.25)=1280塊
泡沫紛飛6, 底面積:3.14×(25.12÷3.14÷2)²;=50.24(平方分米) 圓錐高:452.16÷50.24÷1/3=27(分米)
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