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huongvu6994
2 năm trước
Một người đi xe đạp từ A đến B với tốc độ 12 km/h trong 1/3 quãng đường, 18 km/h trong 2/3 quãng đường còn lại. Tính vận tốc trung bình của người đó trên cả quãng đường AB
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