名校
解题方法
1 . 已知等差数列
满足
,
,数列
的前
项和
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0c6aff839be5e0350c4385ceabee27.png)
(1)求数列
,
的通项公式;
(2)记数列
的前
项和为
,若
对一切
恒成立,求正整数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957790ee1a167591b8fe1c846b680586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9e13729ede92980f61bdcc70a2353c.png)
![](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/73669892605ac63ba1e70afc7a2b5208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0c6aff839be5e0350c4385ceabee27.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
(2)记数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec4bdc2a6d4fc387dc621f0b5a268c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad26bd91784c857975433538d6b3f1a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0c6aff839be5e0350c4385ceabee27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15befbdad977723a86194979c675ee5d.png)
您最近一年使用:0次
2022-10-25更新
|
545次组卷
|
2卷引用:黑龙江省哈尔滨市第六中学校2022-2023学年高三上学期10月月考数学试题
名校
解题方法
2 . 函数
的部分图象如图,当
时,关于x的方程
有四个不同的根,这四个根由小到大分别是
,
,
,
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/ffebc4be-76fe-4558-9dd1-8699a035e151.png?resizew=149)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c416b55a647aff34fdbb875d91a329b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e1e9770a3c33ae04d7322d6947e43b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942fdaa604370c69a8eed39fe6f78ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12a4eecd249473a831d0ee472470240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9565876bc50bceb63e5793c8c67a9032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec13d0c7a2f811a742d7e89960c5fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361b11b445f4801ef928a198c8b46273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/ffebc4be-76fe-4558-9dd1-8699a035e151.png?resizew=149)
A.![]() |
B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() |
D.![]() ![]() |
您最近一年使用:0次
3 . 数列
中,
,
,则此数列前30项的绝对值的和是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4853a0051dba9221156d043548b5f492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e347df0de1d43a4467941f01dbf8e9e9.png)
您最近一年使用:0次
名校
解题方法
4 . 在等差数列
中
为前
项和,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2983de811d419522835a7b26123ce7fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463177c78b8d160b4c6cd17938c62901.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-10-24更新
|
929次组卷
|
6卷引用:黑龙江省哈尔滨市第九中学校2022届高三下学期第五次模拟考试(理科)数学试题
黑龙江省哈尔滨市第九中学校2022届高三下学期第五次模拟考试(理科)数学试题陕西省咸阳市礼泉县第二中学2022-2023学年高二上学期第一次月考数学试题 陕西省宝鸡市陈仓区虢镇中学2022-2023学年高二上学期期中数学试题河南省鹤壁市浚县第一中学2022-2023学年高二上学期11月考试数学试题广西桂林市桂电中学2023届高三上学期10月月考理科数学试题(已下线)4.2.2等差数列的前n项和(第1课时)(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)
5 . 已知等差数列
的公差为d,等比数列
的公比为q,若
,且
,
,
,
成等差数列.
(1)求数列
,
的通项公式;
(2)记
,数列
的前n项和为
,数列
的前n项和为
,求
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49ea9d8789ddd76e598a437111cf13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000f01319364c59dee948848fc4de4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2023-08-01更新
|
278次组卷
|
7卷引用:黑龙江省牡丹江市第一高级中学2022-2023学年高三上学期期末数学试题
黑龙江省牡丹江市第一高级中学2022-2023学年高三上学期期末数学试题河北省衡水中学2023届高三上学期第三次综合素养评价数学试题江西省新余市2019-2020学年高二上学期期末数学(理)试题重庆市第七中学2022届高三上学期高考仿真预测模拟数学试题四川省绵阳实验高级中学2021-2022学年高三上学期10月月考数学(理科)试题云南省元谋县第一中学2022-2023学年高二下学期数学期末模拟(六)试题(已下线)高二上学期期末数学模拟试卷(人教A版2019选择性必修第一册+数列)-【题型分类归纳】2023-2024学年高二数学同步讲与练(人教A版2019)
6 . 已知
,
是不共线向量,正项数列
满足
,
,向量
与向量
共线.
(1)求
的通项公式;
(2)若
,设
,
是数列
的前n项和,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900e1c0ae1846b0f2bf0af5801a7ff7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4864574514a35ee590f394684f2b0e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853eace02560e7f1490694276c29a856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32414bf005401cf15cec135f57389757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4bc0134d12fe175fc56347c7bc050ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70aec3041fe3850e57c1d39c39f9c6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0251d2bea2b94578e67967c024d3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5771798dc80c1586edf434a80d7ac05f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17fc2473ae93aad42d39eec5900ca17.png)
您最近一年使用:0次
7 . 已知
是等差数列,
是等比数列,
是数列
的前n项和,
,
,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeeb24f2d039075550dae5b32cdb2209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ca2fb9235cd31d4dbeb4dffe8d9d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e59af0c0209c8428b558da722a522935.png)
您最近一年使用:0次
2022-10-21更新
|
1132次组卷
|
8卷引用:黑龙江省哈尔滨市第三中学校2022-2023学年高三上学期第二次验收考试数学试题
黑龙江省哈尔滨市第三中学校2022-2023学年高三上学期第二次验收考试数学试题湖北省部分省级示范高中2022-2023学年高三上学期期中联考数学试题广东省广州市第十六中学2023届高三上学期12月模拟数学试题(已下线)专题04 数列的通项、求和及综合应用(精讲精练)-1湖南省岳阳市第五中学2022-2023学年高三上学期第四次月考数学试题(已下线)第四章 数列单元检测卷(知识达标)-【一堂好课】2022-2023学年高二数学同步名师重点课堂(人教A版2019选择性必修第二册)广东省广州市执信中学2022-2023学年高二下学期3月月考数学试题(已下线)模块五 专题3 期中重组卷(湖北)
名校
8 . 近几年,我国在电动汽车领域有了长足的发展,电动汽车的核心技术是电机和控制器,我国永磁电机的技术处于国际领先水平.某公司用9万元进购一台新设备用于生产电机,第一年需运营费用3万元,从第二年起,每年营运费用均比上一年增加2万元,该设备每年生产的收入均为12万元,设该设备使用了
年后,年平均盈利额达到最大值(盈利额等于收入减去成本),则n等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b4538328a9958997db23b225789a97.png)
A.6 | B.5 | C.4 | D.3 |
您最近一年使用:0次
2022-10-21更新
|
404次组卷
|
3卷引用:黑龙江省哈尔滨市第三中学校2022-2023学年高三上学期第二次验收考试数学试题
名校
解题方法
9 . 已知等差数列
的前
项和为
,若
,
,则
( )
![](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/f9b370650491e3a55f15084cbcc60af7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4882d9e118d9a53b435b452bb6fbd8a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c438e70fe73f1040a3ada443aa50404.png)
A.120 | B.60 | C.160 | D.80 |
您最近一年使用:0次
2022-10-21更新
|
789次组卷
|
3卷引用:黑龙江省牡丹江市第一高级中学2022-2023学年高三上学期期中考试数学试题
黑龙江省牡丹江市第一高级中学2022-2023学年高三上学期期中考试数学试题福建省华安县第一中学2022-2023学年高二上学期第一次月考数学试题(已下线)第四章 数列单元检测卷(知识达标)-【一堂好课】2022-2023学年高二数学同步名师重点课堂(人教A版2019选择性必修第二册)
名校
解题方法
10 . 已知等差数列
的公差为
,前
项和为
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/8e5fc9fcbe24c41f1f00ee3e1e60e984.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-10-12更新
|
1054次组卷
|
6卷引用:黑龙江省伊春市铁力市马永顺中学校2022-2023学年高三上学期期中考试数学试题