解题方法
1 . 中国高铁的快速发展给群众出行带来巨大便利,极大促进了区域经济社会发展.已知某条高铁线路通车后,发车时间间隔
(单位:分钟)满足
,经测算,高铁的载客量与发车时间间隔
相关:当
时高铁为满载状态,载客量为
人;当
时,载客量会在满载基础上减少,减少的人数与
成正比,且发车时间间隔为
分钟时的载客量为
人.记发车间隔为
分钟时,高铁载客量为
.
求
的表达式;
若该线路发车时间间隔为
分钟时的净收益
(元),当发车时间间隔为多少时,单位时间的净收益
最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abecc8478de176e4a50a9f8e208f9cc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c22b0f4341af8e8d49ddc16242bb99a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadc63e6e33743ce590ed968948a5a58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd06807e7a486178710108a55f790c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911d8a810adefad92ebbf9258b7fb0df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be8f69402300f6ed932697689212e91c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be8f69402300f6ed932697689212e91c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b5528d8d202c543d426a7e6566846f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e8e630ee2341c792bc403a8745625b.png)
您最近一年使用:0次
2019-09-19更新
|
870次组卷
|
3卷引用:山东省烟台市2018-2019学年高二下学期期末数学试题
2 . 如图,AOB是一块半径为r的扇形空地,
.某单位计划在空地上修建一个矩形的活动场地OCDE及一矩形停车场EFGH,剩余的地方进行绿化.若
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657d17e23a8eecc96aad16e6ede2ae5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/1ce526ac-ff29-4716-9d2d-e537da028f97.png?resizew=185)
(Ⅰ)记活动场地与停车场占地总面积为
,求
的表达式;
(Ⅱ)当
为何值时,可使活动场地与停车场占地总面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac51bffb8f476896081027b33f7ec25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a0339aa52bcc961e84f60d4497ccdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657d17e23a8eecc96aad16e6ede2ae5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/1ce526ac-ff29-4716-9d2d-e537da028f97.png?resizew=185)
(Ⅰ)记活动场地与停车场占地总面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
您最近一年使用:0次
2018-12-14更新
|
1068次组卷
|
5卷引用:【市级联考】山东省泰安市2019届高三上学期期中考试数学(文)试题1