如果数列
对任意的
均有
恒成立,那么称数列
为“M-数列”,下列数列是“M-数列”的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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更新时间:2022-12-26 21:15:53
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【推荐1】意大利著名数学家斐波那契在研究兔子繁殖问题时,发现有这样一列数:
,其中从第三个数起,每一个数都等于它前面两个数的和,人们把这样的一列数所组成的数列
称为“斐波那契数列”.若把该数列
的每一项除以
所得的余数按相对应的顺序组成新数列
,则数列
的前
项和是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa9dc2eb5144210ab14eec752d7cd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐2】南宋数学家杨辉在《详解九章算法》和《算法通变本末》中,提出了一些新的垛积公式,所以论的高阶等差数列与一般等差数列不同,前后两项之差并不相等,但是逐项差数之差或者高次差成等差数列.对这类高阶等差数列的研究,在杨辉之后一般称为“垛积术”,现有高阶等差数列,其前6项分别为1,5,11,21,37,61,……则该数列的第8项为( )
A.99 | B.131 | C.139 | D.141 |
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【推荐1】公差不为0的等差数列
中,前n项和记为
,若
且
,
,
成等比数列,数列
的前n项和为
,若对任意
,
均成立,则实数t的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3426cd62d18ce9a04dedb72173a399d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a888492710e24e13dcf15448f43e8174.png)
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【推荐2】设
是无穷数列,若存在正整数
,使得对任意
,均有
,则称
是间隔递增数列,
是
的间隔数.若
是间隔递增数列,且最小间隔数是3,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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