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nguyenvietxuankrn
2 năm trước
Nam đi từ A -> B với vận tốc 24km/h . Lúc từ B về A đi theo đường khác dài hơn quãng đường lúc đi 5km với vận tốc 30km/h, nhanh hoen lúc đi 40’ . Tính quãng đường AB
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