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Ronaldo07
2 năm trước
Tổng số hạt proton, notron , electron trong 2 nguyên tử kim loại A và B là 142 trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 42 , số hạt mang điện của B nhiều hơn A là 12 . Xác định 2 kim loại A và B Giúp mình với
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