1 . 设
,
,若
,则
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85319a950bf16b9388aa81a5b36b67e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf27b31754829c0e8317cc065b818375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c6c0a39713d7a6e5a7632a9baca161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
您最近一年使用:0次
解题方法
2 . 数列
的首项为
,前
项和为
,若
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5714abe72dbf3fc3c8da134f4b5552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
名校
3 . 已知数列
,
是递增数列,则
的取值范围_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937d04e6d1fb8a8c61a919dc44c954f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2022-01-04更新
|
724次组卷
|
5卷引用:数学奥林匹克高中训练题_47
解题方法
4 . 设数列
满足
,且
,则通项![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c2dc3e8291037e6b180d67b137c37c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f200a5483af0cfa8f56068585cba52d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
解题方法
5 . 若数列
满足
(
为常数),则称数列
为等比和数列,
称为公比和,已知数列
是以3为公比和的等比和数列,其中
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb4c2355ce193435dc15fdc006fd237.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c17008d239a4f8d3fc61eb9042a725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cefeddf71dca8ae824328df3f0e5e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb4c2355ce193435dc15fdc006fd237.png)
您最近一年使用:0次
2024-03-23更新
|
135次组卷
|
2卷引用:第六届高一试题(初赛)-“枫叶新希望杯”全国数学大赛真题解析(高中版)
解题方法
6 . 数列中
,则
您最近一年使用:0次
解题方法
7 . 在
轴的正方向上,从左向右依次取点列
,以及在第一象限内的抛物线
上从左向右依次取点列
,使
都是等边三角形,其中
是坐标原点.则第2009个等边三角形的边长是________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597b66781cf2cb2586a733ccb6a6bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5ad148899b68076f540fc0d2511f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2609698f9a48942a4854ce83b99f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233d1b3cceaccc452eed14ea24f88754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9f50605db5d5f8f3a01ee8e474a112.png)
您最近一年使用:0次
8 . 设
,其中
与
分别表示
的整数部分和小数部分.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f0a319cd059109e55181512b96ac40.png)
________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd6e24718980cabc9d79bd5935a128e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b467b0667aad83b30ce6ef93ed88289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f0a319cd059109e55181512b96ac40.png)
您最近一年使用:0次
解题方法
9 . 已知数列:
,
,那么
是该数列的第____________ 项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ae4585684b63c05eadcab9cb74efae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755e195eaba54c4f76b2a9c2978fd037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033e5735ed3f2544a2d4e95fd19227f9.png)
您最近一年使用:0次
2020-05-11更新
|
305次组卷
|
2卷引用:2019年全国高中数学联赛新疆维吾尔自治区预赛
解题方法
10 . 已知数列
的前
项和为
,若
,
,则数列
的前2008项和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d51ff7f8b797d5c648864f3623010bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c38ef0d27d9cfedce9fc9d1970b58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次