用一根绳子绕柱子2圈则绳子多40厘米,如果绕柱子3圈则绳子少20厘米.这根绳子有多长?
人气:158 ℃ 时间:2019-09-09 17:53:54
解答
(40+20)÷(3-2),
=60÷1,
=60(厘米),
60×2+40,
=120+40,
=160(厘米).
答:这根绳子长160厘米.
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