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Bài 2: giải bài tơn bằng cách lập phương trình Một người đi xe máy từ A đến B với vận tốc trung bình 40km/h. Lúc về người ấy đi với vận tốc trung bình 30km/h. Biết rằng thời gian cả đi lẫn về hết 3giờ 30 phút. Tính quãng đường AB Bài 3: Giải phương trình sau X - 7/2010 + x - 604/471 + x - 2/403 = 9 Ai đó làm ơn giúp em với, bài này khó quá
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