1 . 一个五位数中只有1、3、5这三个不同的数字.则这样的五位数共有______ 个.
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2 . 某班教室桌椅6排7列,有40名同学.空出最后一排的某两个位置,其余人按身高和视力排座位.班中有24人身高高,有18人视力好,其中,有6名同学同时具备此两个条件.已知若一名同学个子矮视力又不好,则他必须坐在前三排;若一名同学个子高视力又好,则他必须坐在最后三排.设排座位的方法是
,则
的质因数分解中的2的次数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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3 .
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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4 . 图是一个
的方格(其中心的方格线已被划去).一只青蛙停在
格处,从某一时刻起,青蛙每隔一秒钟就跳到与它所在方格有公共边的另一方格内,直至跳到
格才停下..若青蛙经过每一个方格不超过一次,则青蛙的跳法总数为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085a73c2b8fb60fa810642040b599a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/5e2afa58-92cd-498a-9b6b-2fd041ad8118.png?resizew=182)
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5 . 用红、黄、蓝、白四种颜色对图所示的区域染色,要求任何两个相邻区域(有公共边界)的颜色均不相同.则一共有______ 种染色方案.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/2d0df3a4-f705-4e19-8be5-94f550115145.png?resizew=183)
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6 . 设
.若有四个互异数
、
、
、
,使
,就称
与
是集
的一个“平衡对”.则集合
中平衡对的个数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9828208aeecede88bb16f96127524a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c027a4e28ec33877b427a2b8fe755860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79352caa9c9439b914343bca8316c2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298385ae5d53312a7d92be9f87c50e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d6cb804663a8d5044284b3f83c92b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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7 . 若三位数
满足
,则称
为“上坡数”.那么,上坡数的个数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a675d752761f68640cb84085823063bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68955de8b3fc1bf43e9f3bdc019c43df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a675d752761f68640cb84085823063bf.png)
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8 . 将4个相同的红球和4个相同的蓝球排成一行,从左至右依次对应序号1,2,…,8.若同色球之间不加区分,则4个红球对应序号之和小于4个蓝球对应序号之和的排列共有______ 种.
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9 . 将
、
、
、
、
、
排成一排,其中
、
都不与
相邻的不同排法种数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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10 . 若从集合
中,取出三元子集
,使得同时满足:
,
,则所有这样的子集
的个数是__________ .(用具体的数字做答).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d978d72876edbbdc94bd43a0f87b6652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d020cd453031ae9eede7961ec78f21a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eb2b089db06ba3a2459e03f943b3477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a3c386db065ccd66239a505e351576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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