做一节底面直径为20厘米,长90厘米的烟筒,至少需要多少平方分米的铁皮?
做一节底面直径为20厘米,长90厘米的烟筒,至少需要多少平方分米的铁皮?
数学人气:333 ℃时间:2019-08-26 04:43:18
优质解答
铁皮=20×3.14×90=5652平方厘米=56.52平方分米
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