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1 . 某城市地铁项目正在紧张建设中,通车后将给市民出行带来便利.已知某条线路通车后,地铁的发车时间间隔
(单位:分钟)满足
.经测算,地铁载客量与发车时间间隔
相关,当
时地铁为满载状态,载客量为
人,当
时,载客量会减少,减少的人数与
的平方成正比,且发车时间间隔为
分钟时的载客量为
人,记地铁载客量为
.
(1)求
的表达式,并求当发车时间间隔为
分钟时,地铁的载客量;
(2)若该线路每分钟的净收益为
(元),问当发车时间间隔为多少时,该线路每分钟的净收益最大?每分钟的最大净收益为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf5fa4491e5b99458fca854f8ae43b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c987ded553c090c1e2fcd28b71b5b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b4fc285a387c0f60a943d54934075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c3594dc13f31613afc11cf7f00ad95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f1fcefccddaa5509b52ce895f88b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59341d8d3e9f9143ff068de1d60596a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded95209f95cb252b0ef6986faf75977.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded95209f95cb252b0ef6986faf75977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
(2)若该线路每分钟的净收益为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0851fcf52e0ce12dcd8c8a7cd1319e2b.png)
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2020-03-15更新
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