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nmanh558
2 năm trước
Bạn Sơn đi xe đạp từ nhà đến TP Hà Nội với vận tốc 15km/h. Lúc về Sơn đi với vận tốc 12km/h, nên thời gian về nhiều hơn thời gian đi là 22p. Tính độ dài quãng đường từ nhà bạn Sơn đến TP Hà Nội.
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