作者jarsi1534265 (jarsi)
看板trans_math
标题[考古] 97辅大贸金
时间Mon Jul 13 21:45:33 2009
题目:
A company's total cost for operating its two warehouses is
C(x,y)=√x‧√y-2 thousand dollars,
where x represents the number of units stored at the first warehouse and
y represents the number of units stored at the second. Find the average
cost to store a unit if the first warehouse has between 0 and 4 units,
and the second one has between 3 and 11 units.
参考书的解答我有了,可是我不懂要怎麽写，而且我看过2个版本
一个是对x定绩分求平均值在对y定积分求平均值，所以有2个答案。
另一个版本是对C函数重积分求平均值，只有一个答案。
不知道哪个才正确，烦请高手点解，感恩!
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