如果准备甲、乙两条足够长的绳子,使甲绳绕赤道一周,乙绳在赤道1m的空中绕赤道一周,乙绳比甲绳长多少?
如果准备甲、乙两条足够长的绳子,使甲绳绕赤道一周,乙绳在赤道1m的空中绕赤道一周,乙绳比甲绳长多少?
数学人气：877 ℃时间：2020-01-25 21:45:14
优质解答
解1：地球的半径r是6371千米,直径d即为12742千米,C=πd,c=40009.88即甲绳=40009.88千米=40009880米乙绳直径12742002米*π=40009886.28-40009880=6.28米解2：甲绳=πd,乙绳=π（d+2）=πd+2ππd+2π-πd就等于2π≈6...
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