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oanhhong.13
2 năm trước
Có 2 bình cách nhiệt .Bình A chứa 5 lít nước ở 60C , bình B 1 lít ở 20C . Đầu tiên rót phần nước từ bình A-B Sau khi cân bằng lại rót một lương nước như thế từ B-A . Nhiệt độ khi cân bằng bình A là 59C . Tính lượng nước đã rót ở bình này sang bình kia
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