作者weiming (瑋)
看板trans_math
標題[考古] 99政大金融系
時間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.
請問有人知道這要怎麼算嗎？謝謝大家
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