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2 năm trước
Một tàu thủy chạy ngược dòng 60 km một người đi xe đạp từ A đến B với vận tốc và thời gian dự định sau khi đi được nữa quãng đường người đó giảm tốc độ 5 km trên quãng đường còn lại vì vậy người đó đến B chạm hơn quy định 1 h.tính vận tốc dự định của n đó
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