1 . 在圆周上依次有
个点
,今随机地选取其中
个点为顶点作凸
边形
,已知选取与否的可能性是相同的,试求对每个
,
边形的两个相邻顶点
(规定
)之间至少有
中的
个点的概率,其中,
是给定的一组正整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73eb3926f6daed59df80e7914c28b768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86ff702f60daaf4aff31db11ed98939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c01a2ab8267152b0c3e6e53efe2903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24220f7001c1fa17f4449a2762fe748d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de6bcd1060b575b8a77ad33f96738c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acb05137c136ad72f1f11851bc7f413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5c11902ea84677a5981738f096869c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591ee536bb3d90a3121946520ec34539.png)
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2 . 数列1,1,3,3,
,
,…,
,
是由两个1,两个3,两个
,…,两个
按从小到大顺序排列,数列各项的和记为
,对于给定的自然数
,若能从数列中选取一些不同位置的项,使得这些项之和恰等于
,便称为一种选项方案,和数为
的所有选项方案的种数记为
.试求:
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3f00a02e931a265f86950296602f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3f00a02e931a265f86950296602f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19209fe2ac669327f8dcb8eab35c9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19209fe2ac669327f8dcb8eab35c9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3f00a02e931a265f86950296602f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19209fe2ac669327f8dcb8eab35c9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c16b8436a2a8806a61a65dbee865483.png)
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2010高三·山东·竞赛
3 . 在多项式
的展开式中,每一字母的指数均不为零的项共有( )项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a983effa53dbfea10f940833752c771.png)
A.35 | B.42 | C.45 | D.50 |
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4 . 以正
边形顶点为顶点的不相同的三角形的个数等于( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.非上述答案 |
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5 . 设
为Fibonacci数列, 定义如下:
,
,
,则方程
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e457d0088349273812d810a0e0f2e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ddfef8cc70941e9ee99f2dd1a440ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae03f424e713f66e0823861689a391e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1c149f99c0415cc0a88b047ef636fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a913a638bfe2ba1e60ea421116398c.png)
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6 .
的正质数解(
,
,
,
,
,
)有______ 组.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f348f09b21cc86a28e08ed0cc4cf0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b21b872313f7d8c5b606981f954a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc119550ce4fc5f3d1daf996e7243bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e727bd61ff43fe654f6532abe939b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f71e8a74d0997b7c680b07985a0880.png)
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7 . 已知集合
,
.若单射
满足
,则这样的单射f有( )个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785ebaf73e19b010c491e39103a86915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ea3c727dc253010d8906b9632bd6df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c644760a91caa2fe663d1fc30dcfa09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994f4fe9fcbf4d92f8b40e480829a37d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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8 . 甲、乙两人做下面的游戏:有一个由两个同轴圆柱组成的有盖容器,如图,里面的实心圆柱底面半径为
,外面的圆柱面的底面半径为
,容器的高为
.在容器内放入
个半径为
且质地相同的小球,其中红、黄、蓝色各
个,随意翻动容器,然后将容器直立在桌面上.当小球全部停止后,如果有两个颜色相同的小球相邻,则甲胜,否则乙胜.那么,甲胜的概率为.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/07ae80fa-d9ea-44e7-8284-6a84da9282a6.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a167970b998655367e3fb81e7cafe883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f953d79ae365a13161ad83f022362f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/07ae80fa-d9ea-44e7-8284-6a84da9282a6.png?resizew=136)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 从1至144的自然数中,任意取出三个数构成以整数为公比的递增等比数列的取法种数是______ .
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