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dieuhien7315
2 năm trước
Cứ 1kg giấy vụn thì sản xuất được 25 cuốc vở hs.Hỏi có thể sản xuất bao nhiêu cuốn vở hs từ 1 tạ giấy vụn, 1 tấn giấy vụn? Nhanh gíup mình (T.T)
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