高三某班上午有五节课,分别安排语文,数学,物理,化学,生物各一节课.要求语文与物理相邻,数学和物理不相邻,且数学课不排第一节,则不同排课法的种数是_____
更新时间:2020-02-09 18:43:50
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【推荐1】设集合
,集合
,
,
满足
且
,那么满足条件的集合
的个数为_________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82468a8ceda9d0573e58b98a3c866dcd.png)
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【推荐2】某校
名学生参加军事冬令营活动,活动期间各自扮演一名角色进行分组游戏,角色按级别从小到大共
种,分别为士兵、排长、连长、营长、团长、旅长、师长、军长和司令.游戏分组有两种方式,可以
人一组或者
人一组.如果
人一组,则必须角色相同;如果
人一组,则
人角色相同或者
人为级别连续的
个不同角色.已知这
名学生扮演的角色有
名士兵和
名司令,其余角色各
人,现在新加入
名学生,将这
名学生分成
组进行游戏,则新加入的学生可以扮演的角色的种数为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180ea775f2af05650404d764384e7faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
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