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lekhai6002
2 năm trước
1 xe máy lên dốc từ A đến B vận tốc 25km/ giờ. Nghỉ lại B 1giờ, sau đó trở về A với vận tốc gấp đôi lúc đi. Tính quãng đường AB biết thời gian cả đi, nghỉ và về là 7 giờ.
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