作者love606009 (Jay~^^)
看板trans_math
标题[考古] 96实践转学考 微积分题目...
时间Thu Jul 10 12:05:50 2008
某一题...
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.
这题我完全看不出来後半段再描述什麽...无法下笔
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