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sraz789
2 năm trước
1) Trên hộp sữa có ghi: “Khối lượng tịnh 500g”. Số đó cho biết điều gì? 2) Ta đặt vật A lên đĩa cân bên trái và đặt các quả cân lên đĩa cân bên phải của cân roberval. Muốn cân thăng bằng ta phải đặt hai quả cân 200g, một quả cân 100g, hai quả cân 20g. Vậy khối lượng của vật A là bao nhiêu?
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