题目内容
已知某公司生产品牌服装的年固定成本为10万元,每生产千件,须另投入2.7万元,设该公司年内共生产品牌服装
千件并全部销售完,每千件的销售收入为
万元,且
.
(1)写出年利润
(万元)关于年产量
(千件)的函数解析式;
(2)当年产量为多少千件时,该公司在这一品牌服装的生产中所获年利润最大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107098266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107113514.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241071291966.png)
(1)写出年利润
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107144396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107098266.png)
(2)当年产量为多少千件时,该公司在这一品牌服装的生产中所获年利润最大?
(1)
;(2)9.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241071602521.png)
试题分析:(1)年利润=销售总收入-总成本,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107176787.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107191469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107207545.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107144396.png)
试题解析:(1)由题意得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241072222939.png)
即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241072382396.png)
(2)①当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107254475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107269956.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241072851506.png)
∵
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107254475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107300470.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107316520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107144396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107347516.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107347513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107144396.png)
∴当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107394380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107144396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107425711.png)
②当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107425425.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241074411268.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240241074561088.png)
当且仅当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107472686.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824024107488628.png)
综上,当年产量为9千件时,该公司在这一品牌服装的生产中所获年利润最大.
![](http://thumb2018.1010pic.com/images/loading.gif)
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