一根绳子,剪去全长的2/9,还剩9米,这根绳子长几米?
问题描述:
一根绳子,剪去全长的2/9,还剩9米,这根绳子长几米?
答
一根绳子,剪去全长的2/9,还剩9米,这根绳子长几米?
9/(1-2/9)=81/7