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bichthuy222002
2 năm trước
: Một ô tô đi từ A đến B với vận tốc 50km/h và sau đó quay trở về từ B đến A với vận tốc 40km/h. Cả đi và về mất 5 giờ 24 phút. Tính chiều dài quãng đường AB.
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