名校
解题方法
1 . 已知数列
的前
项和为
,
,且
为
与
的等差中项,当
时,总有
.
(1)求数列
的通项公式;
(2)记
为
在区间
内的个数,记数列
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853eace02560e7f1490694276c29a856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d04a8b7a7595251251b8e0b7e665e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5453ec6a9e8b96357c888ea863ddcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd72016a9855cbf0056ff732fe872612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1f98fb37e8417e282f0ae247a905c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f52bff9100489528eddeded2ebe8c2f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8bf51b2c8c6d0c0d7f7c2470c58ce29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a3a77653fc264711bc56f85dcd68ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afafadf01f522452d6a0ebe53a95fea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab4717e4827480f0f6f4ded85e52eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed76c31c721e6e0dffa7e8020d3e6610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f83aea6344e18af076a0c31b2100a8.png)
您最近一年使用:0次
2022-10-18更新
|
478次组卷
|
8卷引用:山东省青岛市2021届高三调研检测数学试题
山东省青岛市2021届高三调研检测数学试题(已下线)专题18 等比数列——2020年高考数学母题题源解密(山东专版)(已下线)数学-学科网2020年高三11月大联考考后强化卷(山东卷)(已下线)专题18 等比数列——2020年高考数学母题题源解密(海南专版)江苏省常州市前黄高级中学2021届高三下学期学情检测(二)数学试题(已下线)第四章 数列单元测试(提升卷)-2020-2021学年高二数学新教材单元双测卷(人教A版2019选择性必修第二册)江苏省苏州中学2022-2023学年高二上学期10月月考数学试题甘肃省临夏、甘南两地2022-2023学年高二上学期期中联考文科数学试题
2 . 若
,则数列
的前21项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb261bb45b5137a7236ccddcfdface6f.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c731a8f1ac4d99e3e9111e5e111d13e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb261bb45b5137a7236ccddcfdface6f.png)
您最近一年使用:0次
2021-02-03更新
|
1089次组卷
|
6卷引用:山东省济宁市2020-2021学年高二上学期期末数学试题
山东省济宁市2020-2021学年高二上学期期末数学试题山东省菏泽市东明县第一中学2023-2024学年高二下学期开学考试数学试题山东省淄博第五中学2022-2023学年高二下学期3月月考数学试题山东省枣庄市第三中学2021-2022学年高二上学期期末数学试题(已下线)第10练 数列求和-2022年【寒假分层作业】高二数学(苏教版2019选择性必修第一册)广东省深圳市第七高级中学2021-2022学年高二上学期期末数学试题
名校
解题方法
3 . 已知数列
的前
项和为
.
(1)求数列
的通项公式;
(2)数列
,
表示不超过
的最大整数,求
的前1000项和
.
![](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/12e82f82ea3a90feeaf8d603859fb670.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a70aa10c5078d2ed248500fd13cb752.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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6395cfb9d7bf96c2d00c3c2cdc48b81f.png)
您最近一年使用:0次
2020-09-16更新
|
1349次组卷
|
8卷引用:山东省2021届高三开学质量检测数学试题
山东省2021届高三开学质量检测数学试题2021届高三高考必杀技之新定义题专练(已下线)第四章 数列单元测试(基础卷)-2020-2021学年高二数学新教材单元双测卷(人教A版2019选择性必修第二册)广东省广州市铁一中学2022届高三上学期期末数学试题江西省南昌市第十中学2023届高三第一次模拟数学(文)试题江西省南昌市第十中学2023届年高三第一次模拟数学(理)试题甘肃省天水市清水县2022-2023学年高二上学期期中文科数学试题广东省佛山市顺德区郑裕彤中学2022-2023学年高二下学期3月第一次段考数学试题
名校
解题方法
4 . 已知
是等差数列,且公差
,
是等比数列,且
,
,
.
(1)求数列
,
的通项公式;
(2)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769fe52ac96348d3b12d23d06d702595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfe26b3ab1cd6a93075f24b696b0cef.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d44ddab6e0c60119be69985ae7fa65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a107ab533d39b3bd0933429156ff33bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-04-06更新
|
661次组卷
|
4卷引用:山东省滨州市博兴县第一中学2019-2020学年高三上学期入学考试数学试题
5 . 已知数列
是公差为
的等差数列,若
成等比数列.
(1)求数列
的通项公式;
(2)令
,数列
的前
项和为
,求满足
成立的
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cbf1d472155ff216770dc67551ec1d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d4bd0351de6b4220befc7cb1d41ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/af41f69faa99e847ee18d2de283542aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2018-11-10更新
|
450次组卷
|
2卷引用:山东省淄博实验中学2018-2019学年高三寒假学习效果检测(开学考试)数学(文科)试题
解题方法
6 . 设数列
的前
和为
,已知
.
(1)求出数列
的通项公式;
(2)求数列
的前
和为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/e0578df3fd719d5004486e987f72d8a8.png)
(1)求出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cf5304f428de84f9c73951d5fdf4d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次