已知一个正整数集合
,其元素之和为2009,试求其元素之积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9526d6b90914ec17fdda5040ceeda7.png)
2019高三·全国·竞赛 查看更多[1]
更新时间:2018-12-27 11:59:19
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【推荐1】给定正整数
,集合
,
,且
,其中,
满足
是7的倍数
.求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1368a045ba80f97383f3d9d7fcdc8f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90c998886b1483221a5b4941f6e874c.png)
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【推荐2】设
为等差数列,
为公差,且
和
均为实数,
,它的前
项和记作
.设集合
,
.
下列结论是否正确?如果正确,请给予证明;如果不正确,请举一个例子说明.
(1)以集合
中的元素为坐标的点都在同一直线上;
(2)
至少有一个元素;
(3)
时,一定有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b42791b77924729f7e31712177b26af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd71318ddbb81a2d7ed7847e1ff744a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77c5b3be99aff610c2cb366821f6444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904af6ce5ad15896e9b3d76297d6f20d.png)
下列结论是否正确?如果正确,请给予证明;如果不正确,请举一个例子说明.
(1)以集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9682ecfd0d8b9b413e2b5b4b1e7d5f79.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b773487fe38f5239d8291c0482eb429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230f2747340e29ab288d9b5b8cc44b30.png)
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【推荐1】如果一个多项式的系数都是自然数,则称为“自然多项式”.对正整数
,用
表示满足
的不同自然多项式
的个数.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507a548a09458dc6909ea37552397905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27245125de9ecccd2c8344308d67c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826308511448f7b791edf4199c690768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5cc8fd528222aa0dccfda5a7ad4c4a.png)
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【推荐2】设
是正整数,集合
是数集
的一个子集,且
中任意两个数的差不等于4或7.若
的元素个数的最大值记为
(如
,
),试求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b188b406043e78f79a1899f4de3c33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f6dfcf6a5eb0da8cf94611fbea34ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/256fec14c0b3ec7c75c23498c89409ce.png)
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【推荐1】已知
元集合
的一些子集满足:每个子集至少含2个元素,每两个不同子集的交集至多含2个元素,记这些子集的元素个数的立方和为
.问:是否存在不小于3的正整数
,使
的最大值等于2009的方幂?说明你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8715a3f984d2627afd7c40c61347b7cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】求出所有满足下面要求的不小于1的实数
:对任意
,
,总存在
,
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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