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2 năm trước
Một người đi xe máy từ A tới B cách 45km . Trong nửa thời gian đầu đi với vận tốc v1 , nửa thời gian đi với v2 = 2/3 v1 . xác định v1 , v2 biết sau 1h30 phút người đó đến B
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