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mingo.swiftie
2 năm trước
Một người đi xe máy từ A đến B với vận tốc 30 km/h. Lúc về người đó đi với vận tốc 24 km/h. Do đó thời gian về lâu hơn thời gian đi là 30 phút. Nếu gọi thời gian lúc đi là x (h) (x > 0) thì phương trình của bài toán là?
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