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nguyenbichchuong91
2 năm trước
Một người đi xe đạp từ A đến B cách nhau 100km.Hai giờ 10 phút sau một ô tô đi từ A và đến B trước người đi xe đạp 60 phút.Tính vận tốc mỗi xe biết vận tốc người đi ô tô nhanh hơn xe đạp 30km
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