某公司购买一批机器投入生产,据市场分析每台机器生产的产品可获得的总利润
(万元)与机器运转时间
(年数,
)的关系为
,则年平均利润的最大值是多少万元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09da1c22db60a433d6ca5496bdae2466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe237387979f71c5b9827640e2064828.png)
A.5万元 | B.6万元 | C.8万元 | D.9万元 |
更新时间:2018-12-06 00:25:41
|
【知识点】 基本不等式求和的最小值解读
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【推荐1】已知函数
,
是函数
的4个零点,且
,给出以下结论:①m的取值范围是
;②
;③
的最小值是4;④
的最大值是
.其中正确结论的个数是( )
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A.1 | B.2 | C.3 | D.4 |
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单选题
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较难
(0.4)
【推荐2】已知
满足
,
的最大值为
,若正数
满足
,则
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9defa23d2a9b88f4dd10e0ea4bef2189.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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