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loga123dira
2 năm trước
Người ta mở vòi nước chảy vào bể.nếu mở vòi 1 thì 3 giờ bể sẽ đầy .nếu mở vòi thứ hai thì 4 giờ sẽ đầy bể .nếu mở cả hai vòi thì 1 giờ bao nhiêu phần của bể nước
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