一根绳子用去2⼀5,还剩2⼀5米,这根绳子长多少米?用去多少米?

2025-06-28 01:56:15
推荐回答(1个)
回答1:

绳子长:2/5÷(1-2/5)=2/3米
用去:2/3×2/5=4/15米