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thuongdieunguyen1
2 năm trước
Mấy bạn giỏi toán trả lời giùm mình câu này, trả lời được trong mình sẽ vote cực mạnh và đc 15 điểm nha Câu hỏi: Một hợp kim gồm đồng và kẽm trong đó có 5 gam kẽm. Nếu thêm 15 gam kẽm vào hợp kim này thì được một hợp kim mới mà trong đó lượng đồng đã giảm so với lúc đầu là 30%. Tìm khối lượng ban đầu của hợp kim.
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