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2 năm trước
Hai ô tô cùng khởi hành một lúc tại A để đi đến B.Ô tô thứ nhất đi vs v=40 km/h, ô tô thứ hai đi vs v 50 km/h.Biết rằng ô tô thứ nhất tới B chậm hơn ô tô thứ hai 1h30p.Tính độ dài quãng đường AB
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