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Quangvu12
2 năm trước
Làm hộ mình bài này Nguyên tử của nguyên tố x có tổng số hạt là 60 trong đó hạt mang điện nhiều hơn hạt không mang điện là 20 hạt có trong nguyên tử x xác định x là nguyên tử có nguyên tố hóa học
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