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vanhocthptbinhphu
2 năm trước
1 ô tô đi từ a đến b với vận tóc 40km/h sau khi đi được 2/3 quãng đường, ô tô đã tăng vận tốc lên 50km/h . tính quãng đường ab. biết thời gian ô tô đi hết quãng đường đó là 7 giờ
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