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tranghexy2004
2 năm trước
Có 2 lọ nước muối có nồng độ dung dịch là 3,5% và 1%.Hỏi người ta phải lấy ở mỗi lọ bao nhiêu gram để được 100 gram nước muối có nồng độ dung dịch là 2% ?
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