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hanhnguyendu264
2 năm trước
một ô tô đi từ A đến B với vận tốc ban đầu là 40 km/h. Sau khi đi được 2/3 quãng đường , ô tô tăng vận tốc lên 50km/h . Tính quãng đường AB biết rằng thời gian ô tô đi hết quãng đường đó là 7h _giúp mình bài này nữa :<
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