1 . 一次铁人三项比赛中,每名参赛选手须在指定的游泳池里游
个来回,然后骑车10公里,最后跑3公里.已知共有n名选手参赛,由于场地条件限制,游泳池内只能同时容纳一名选手(即上一名选手上岸时下一名选手方可下水),骑车与跑步则无限制.记序号为
的选手游泳、骑车、跑步所用时长的期望分别为
,
,
,为了使得总完赛时间(即从1号选手下水到
号选手跑完的总时长)尽可能短,应采取的策略是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b2069dd736a65ca79485d32b82a31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1602c6064af12eed3fd1291f8272d93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5c11902ea84677a5981738f096869c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.让![]() | B.让![]() |
C.让![]() | D.让![]() |
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