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Thutran2002
2 năm trước
1)cho dung dịch A có 300g dung dịch NaCl 10% a)Cần thêm bao nhiêu gam NaCl vào dung dịch A để được dung dịch B có nồng độ 12% b)Thêm 200g dung dịch NaCl 5% vào dung dịch A ta thu được dung dịch C.Tính nồng độ % của dung dịch C
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