1 . 现有一块长方形钢板
(如图),其中
,
米,运输途中不慎将四边形
部分损坏,经测量,
米,
米,
,
.现过点
沿直线
将破损部分切去(
,
分别在
,
上),设
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/96c073ce-2572-4371-a17c-8d036a494843.png?resizew=188)
(1)请将切去的
的面积表示为
的函数
;
(2)当
的长度为多少时,切去的
面积最小?并求出最小面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29560c08663a8e61d56c8ba3ef5633d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec8156abd6b02c4bef5eafd48a88d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d8cebc03755bbedf97d77f89846a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff43a4663a4976224104a4505047988b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8bbee4d1d7856735ec8b531f051710.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/96c073ce-2572-4371-a17c-8d036a494843.png?resizew=188)
(1)请将切去的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
您最近一年使用:0次
名校
解题方法
2 . 某水库堤坝因年久失修,发生了渗水现象,当发现时已有
的坝面渗水.经测算知渗水现象正在以每天
的速度扩散.当地政府积极组织工人进行抢修.已知每个工人平均每天可抢修渗水面积
,每人每天所消耗的维修材料费75元,劳务费50元,给每人发放50元的服装补贴,每渗水
的损失为250元.现在共派去
名工人,抢修完成共用
天.
(1)写出
关于
的函数关系式;
(2)要使总损失最小,应派去多少名工人去抢修(总损失=渗水损失+政府支出).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30414777b108d2fb1cdabd09c265a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303dd9dcc519133e7fde976018cc0b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d282f2e8724f5a37a02c470aca736a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37d3860a1a4144a424a27fd121742f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)要使总损失最小,应派去多少名工人去抢修(总损失=渗水损失+政府支出).
您最近一年使用:0次
2021-07-31更新
|
358次组卷
|
4卷引用:江苏省连云港市板浦高级中学2020-2021学年高二上学期期中数学试题
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