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uyendang
2 năm trước
một người đi xe đạp từ a đến b với vận tốc 15 km/h,lúc về từ b đến a đi được vận tốc 12 km/h,biết tổng thời gian lúc đi qua lúc về là 1h30.tính quãng đường ab
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