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haiyenin12
2 năm trước
cả ba vòi chảy vào bể được 1080 lít nước biết rằng vòi thứ nhất chảy được nhiều hơn vòi thứ 2 18 lít nước nhưng ít hơn vòi thứ 3 18 lít nước hỏi mỗi vòi chảy được số lít nước ?
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