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  5. 求解 後面要怎麼算
Mathematics
初中
已解决
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求解
後面要怎麼算

2. 科學家周小杰發現某放射性物質的 經過相同時間後的衰減率相同,若 n 問至少需 4 年,其質量才 10 (0.8) <0.5 5

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