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tran.bao.dang.phuong
2 năm trước
Một người đi xe đạp đi được 1/3 quãng đường đầu với vận tốc v1= 10km/h , đi quãng đường còn lại với vận tốc v2= 15km/h Tính vận tốc trung bình của người đó trên cả quãng đường
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