Chính xác, 3kg= 3000g, 5000g= 5kg, 8kg = 8000g, 2kg400g = 2400kg, 6000g = 6kg, Chưa chính xác, 9kg= 900g, 400g = 4kg, 700g = 7kg, 2kg400g = 240g, 600g = 6kg

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