3.14×（40÷2）2+3.14×40×30，
=1256+3768，
=5024（平方厘米）；
答：做这个水桶至少需要5024平方厘米的铁皮．
做一个底面直径是40cm，高是30cm的圆柱形无盖铁皮水桶，至少需要多少铁皮？
做一个底面直径是40cm，高是30cm的圆柱形无盖铁皮水桶，至少需要多少铁皮？
数学人气：823 ℃时间：2019-08-19 23:51:18
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