用铁丝把两根同样粗的钢管扎2圈,钢管每根外直径为20cm,如铁丝的接头长度及粗细不计,这根铁丝至少要多长
用铁丝把两根同样粗的钢管扎2圈,钢管每根外直径为20cm,如铁丝的接头长度及粗细不计,这根铁丝至少要多长
数学人气:208 ℃时间:2019-10-24 10:54:39
优质解答
(20*3.14)*2=125.6cm
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