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Mathematics, 09.08.2021 04:40 fvmousdiana
Hai vòi cùng chảy vào một bể sau 10h sẽ đầy, nếu mở vòi 1 trong 6h rồi khóa lại và mở vòi 2 trong 3h thì đầy 2/5 bể. Hỏi nếu mở riêng mỗi vòi sau bao lâu sẽ đầy bể
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Hai vòi cùng chảy vào một bể sau 10h sẽ đầy, nếu mở vòi 1 trong 6h rồi khóa lại và mở vòi 2 trong 3h...
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