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tranthidiu2703
2 năm trước
Biết rằng 200g dung dịch nước muối có chứa 50g muối.Người ta cần pha loãng dung dịch để thu được dung dịch mới chứ 20% muối.Hỏi cần pha loãng thêm bao nhiêu gam nước?
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