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nguyentinh5192
2 năm trước
0,5 tạ = kg 2mg - kg có 20 túi đường , ban đầu mỗi túi ó khối lượng 1 kg , sau đó ta cho thêm mỗi túi 2 lạng dduongf nữa . tính khối lượng của 20 túi đường cần đáp án ko cần lời giải
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