作者weiming (玮)
看板trans_math
标题[考古] 99政大金融系
时间Wed Dec 1 01:11:01 2010
A company's sales rate is x^2 exp{-x} million sales
per month after x months.
Find a formula for the total sales in the first x months.
请问有人知道这要怎麽算吗？谢谢大家
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