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phat80479
2 năm trước
a/nguyên tử Y có tổng số hạt trong hạt nhân nguyên tử là 31. số hạt không mang điện bằng 8/15 số hạt mang điện. b/ tổng số hạt trong hạt nhân nguyên tử bằng 35. biết rằng số hạt không mang điện nhiều hơn số hạt mang điện âm 1 đơn vị
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