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tunghiennguyetgiai
2 năm trước
1 quyển sách có khối lượng 0, 5 kg được đặt trên mặt bàn nằm ngang. Biểu diễn các lực tác dụng vào quyển sách với tỉ xích 1 cm ứng với 1N. Bài tập SGK Vật Lí 8
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