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标题: 请教 [打印本页]

作者: fdgggd 时间: 2005-3-9 12:53 标题: 请教

One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where

C=6.5x+8.5y, Is x<0.8?

(1) y>0.15 (2) C>=7.30

请教此题B怎么推出的？

作者: himba 时间: 2005-3-9 12:59

x+y=1 => y=1-x 代入 6.5x+8.5y>=7.3

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