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nhanpham263
2 năm trước
một người cắt một thanh sắt dài 90cm thành những đoạn dài 15cm, mỗi lần mất 5 phút , thời gian nghỉ giữa hai lần cắt là 2 phút. vậy thời gian người ấy cắt xong khúc gỗ là:...
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