Re: [考古] 99政大金融系
sales rate = 銷售量 / 月 = dy/dx = x^2 exp{-x}
求最初到 x 月的累積銷售量:
dy = ( x^2 exp{-x} )dx 積分此式,起點為零,終點為x
※ 引述《weiming (瑋)》之銘言:
: 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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12/01 01:38, , 1F
12/01 01:38, 1F
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