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momcoi1003
2 năm trước
Câu 2 : Một vật đi hết quãng đường AB. Trong nửa thời gian đầu vật đi với vận tốc 10km/h, trong nửa thời gian còn lại vật đi với vận tốc 30km/h. Tính vận tốc trung bình của vật trên quãng đường AB
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