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小聪用一根绳子来测一口井的深度,他把绳子的一端放入井底,井口外绳子长9米.小聪把这根绳子对折后,将一端放入井底,折时在井

小聪用一根绳子来测一口井的深度,他把绳子的一端放入井底,井口外绳子长9米.小聪把这根绳子对折后,将一端放入井底,折时在井口外的绳子还有3米,这口井深几米?
xiao123shuai 1年前 悬赏5滴雨露 已收到1个回答 我来回答 举报

团团的球 春芽

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这口井深1.5米

1年前

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