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cuongp264
2 năm trước
một ô tô đi từ A đến B với vận tốc v1 bằng 40km/h. trong nửa thời gian quãng đường còn lại đi với Vận tốc v3 bằng 30 km.Tính vận tốc trung bình trên cả đoạn đường AB GIÚP MK VS Ạ
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