1 . 在由201320132013块单位正方体组成的大正方体中,若作直线使其穿过2013个单位正方体的中心,则这样的直线可以作______ 条.
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2 . 若随机投掷大小不同的三枚骰子,则其中有两枚或三枚骰子上显示的数字之和是7的概率为______ .
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3 . 设红、黄、蓝三种颜色的小球各有10个.现将其全部放入甲、乙两个袋子中,要求每只袋子里三种颜色的小球都有,且甲、乙两只袋子中三种颜色的球数的平方和相等.共有______ 种放法.
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4 . 方程
满足
的正整数解
有______ 组.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115cce39252dbc1f9dcaf79aff0a19e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d561cdf17d3a6d7d57af719cb6100c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b525d8c768efd801ab58bc4c0da9221e.png)
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5 . 一个五位数
满足
,且
,
(如37201,45412),若其数码随位数的变化规律类似正弦函数在一个周期上单调性的变化,则称这个五位数符合“正弦规律”.那么,共有__________ 个五位数符合正弦规律.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762529cb88e72b16781e15052469306d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54aaf9286953b611bbcef77c217468db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9535de0a4b297b24c3a424df1b3ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d87b521cc81c2280d4b29dd7dcae5e2.png)
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6 . 设集合
,证明:对任意
,都存在
和正整数
使得
,其中,
表示不超过实数
的最大整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08529a9da4863a1cde8a8ad89bdf7531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb8dc6eb2d22e07ee5108746161eba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa58f46ec759a37cbe9852e2308da358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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7 . 设函数
的值域为
.则满足条件的函数
的个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828a6d1060f83c3a853e2f5597489aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6f56255cc5e39fdab460a6a4d7a87d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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8 . 已知各项均为整数的无穷数列
满足:
、
、
,
,
,
,
,
,
证明:对任何大于1的正整数
,存在无穷多个正整数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3f1dd7a247b85e44db8b2a8c443007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213f8295ee5e975f665bb8c129bc3400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd28714fe2d61e67c2676baa66e7f473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34945a161fb0585d81f1c02c02b445a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2571966797f0d86b93dfce4c17436074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565115ddac86bbb9aa4f6b59869375b0.png)
证明:对任何大于1的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fb71bbba75ae0e71e1bff08147b185.png)
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9 . 在
方格表中的每个方格内填入一个“
”号或“
”号.若一个有序整数组
具有以下性质:
(i)
;
(ii)
;
(iii)在上述
方格表中的第
列的每个方格中“
”(或“
”)号后添上
,使得第
行的数之和为
.则称
为“优数组”,证明:至少存在四个不同的优数组.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0fa0a3b325a88a1bc15c57742fa766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9455710c41713814ef0c51e56e4febb.png)
(i)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/409e5138070f07318abd90dbac91d005.png)
(ii)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a3d640a704b47d79086258bd50924ac.png)
(iii)在上述
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba89cd6518a9c1b62381cc2b8b7396a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bababe3672406f749aa3b314b63b08ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5deaa685c0f7ea6262d6fe8860e456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9455710c41713814ef0c51e56e4febb.png)
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10 . 给定大于1的正整数
,对任何正整数,若它的
进制表示中没有数字零,则称其为“
充实的”.那么,
中
充实的自然数的个数为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebb18d27b0418efa28e77b72d43efdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/796bb39a2ab23cfdb6e463ab30a7af2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9121ba2ce815e0207792d5b0afb25787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/796bb39a2ab23cfdb6e463ab30a7af2e.png)
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