设绳子绕树一圈为X尺.
3X+4=4X-3
4+3=4X-3X
x=7
7×3+4=25（尺）
7×4-3=25（尺）
答：绳子长25尺.
用一根绳子环绕一棵大树,若环绕大树3周,则绳子还多4尺：若环绕大树四周,则绳子又少了3尺.这跟绳子有多
用一根绳子环绕一棵大树,若环绕大树3周,则绳子还多4尺：若环绕大树四周,则绳子又少了3尺.这跟绳子有多
数学人气：211 ℃时间：2019-12-12 09:49:46
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