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fifai2017
2 năm trước
Tổng số hạt mang điện trong ion `AB_{4} ^{3-}` là 50. Số hạt mang điện trong nguyên tử A nhiều hơn số hạt mang điện trong hạt nhân nguyên tử B là 22. Số hiệu nguyên tử A, B lần lượt là?
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