作者love606009 (Jay~^^)
看板trans_math
標題[考古] 96實踐轉學考 微積分題目...
時間Thu Jul 10 12:05:50 2008
某一題...
A radioactive isotope has a half-life of 40 years. at=0,there are 200 grams of
this substance. find the amount of this isotope present at time t using an
exponential model of decay.
這題我完全看不出來後半段再描述什麼...無法下筆
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