62.8÷3.14÷2-31.4÷3.14÷2,
=10-5,
=5(厘米),
答:圆环的宽是5厘米.
有一个圆环,内圆的周长是31.4厘米,外圆的周长是62.8厘米,圆环的宽是多少厘米?
有一个圆环,内圆的周长是31.4厘米,外圆的周长是62.8厘米,圆环的宽是多少厘米?
数学人气:946 ℃时间:2020-04-07 22:44:27
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