名校
1 . 某人写了
封不同的信和
个相应的不同信封,设这
封信全都装错信封的方法有
种,易知
,
,递推公式为
经过变形构造化简计算,可得它的通项公式为
,其中
为自然对数的底数,
表示不大于
的最大整数,
.则
=______
![](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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656945f0860b6453f495356b597a4284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8167bd864bba47020865f6e0345f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096d0fb92f2d4568302061ba70a367f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d864b9654e7104a3b43e7230af887280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
您最近一年使用:0次
2 . 已知
,则数列
中落在区间
内的项的个数是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1085334aa40c03faa73f8f09c5332627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354e43caea32568c80e66617d1ce3719.png)
您最近一年使用:0次
3 . 形如
都是正整数,
,且
的最大公因数为1
的数叫真分数,数列
是由所有满足
时的真分数构成的,且
是递增数列,则数列
共有__________ 项,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f34f8b8240cbb43816af84524ef4c7f.png)
__________ ..
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ea8d78ea1af5c3e5fdb719a5b53135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4610754dff007c541aa4887d8705329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e528800983d901c24f0530faa55e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f34f8b8240cbb43816af84524ef4c7f.png)
您最近一年使用:0次
2021-05-24更新
|
340次组卷
|
3卷引用:全国1卷2021届高三二轮复习联考(三)数学试卷(新高考卷)