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loga1302
2 năm trước
Bài 1:Theo kế hoạch một máy bơm nước loại nhỏ phải bơm nước vào ruộng trong 12 giờ. Nhưng do thay máy bươm nhỏ bằng máy bơm lớn, mỗi giờ bơm được nhiều hơn 5m3 nên chẳng những 9 giờ đã bơm xong mà còn vượt mức 3m3 nữa. Hỏi theo kế hoạch phải bơm vào ruộng bao nhiêu mét khối nước? Ai giúp với thứ 2 mình cần rồi!!!!!!!!!
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