解题方法
1 . 在正项等差数列
和正项等比数列
中,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
A.若![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
解题方法
2 . 记数列
的前
项和为
,已知
,且
.若对任意的
,都有
,则实数
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.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/72ec133cc72a42633ce92269a560f298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c695a6d7244c2fa609432ed5f51d0ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2020-11-28更新
|
1248次组卷
|
5卷引用:2020届山西省晋中市高三普通高等学校招生统一模拟考试(四模)数学(文)试题
2020届山西省晋中市高三普通高等学校招生统一模拟考试(四模)数学(文)试题山西省2020届高三(6月份)高考数学(文科)模拟试题安徽省合肥市肥东县高级中学2020-2021学年高三上学期期中数学(文)试题(已下线)4.2.3 等差数列的前n项和(1)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)广东省2021届高三数学八省联考考前模拟仿真模拟卷
2020·全国·模拟预测
解题方法
3 . 中国南宋时期杰出数学家秦九韶在《数书九章》中提出了“三斜求积术”,即以小斜幂,并大斜幂,减中斜幂,余半之,自乘于上;以小斜幂乘大斜幂,减上,余四约之,为实;一为从隅,开平方得积.把以上文字写成公式,即
(
为三角形的面积,
、
、
为三角形的三边).现有
满足
,且
的面积
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bd5fefb9a7c618d1ef8d73b3c43cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12742a58429a71d3f295b724256a37e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024bae8fe1437f7f99ee273b903236f9.png)
A.![]() ![]() | B.![]() ![]() ![]() ![]() |
C.![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
2020-11-24更新
|
1875次组卷
|
8卷引用:河北省石家庄市正中实验中学2020-2021学年高二上学期第三次月考数学试题
河北省石家庄市正中实验中学2020-2021学年高二上学期第三次月考数学试题(已下线)2021届全国著名重点中学新高考冲刺数学试题(9)湖南省常德市第二中学2020-2021学年高二(332班)下学期期中数学试题(已下线)重难点02 三角函数与解三角形-2021年高考数学【热点·重点·难点】专练(新高考)(已下线)黄金卷06-【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(山东高考专用)(已下线)热点03 等差数列与等比数列-2022年高考数学【热点·重点·难点】专练(全国通用)(已下线)专题1 三斜求积 巧求面积 练(已下线)【讲】专题8 三角函数中的新定义、数学文化问题
解题方法
4 . 设数列
的前
项和为
,且
,
.
(1)求证:数列
为等比数列;
(2)设数列
的前
项和为
,求证:
为定值;
(3)判断数列
中是否存在三项成等差数列,并证明你的结论.
![](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/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c806dc9bf2cad0cb20220d23bd252a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b87635913b4f90a784edd6ef79f2aec.png)
(3)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6421b801b00bceab7547d9ed86874e.png)
您最近一年使用:0次
5 . 设数列
的前
项和为
,当
时,
,
,
成等差数列,若
,且
,则
的最大值为( )
![](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/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f48b614c438013c270ec084c38441d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d6b8f10142a7b23ee19cae223f378c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e020389b5472cfdce5becbf5cbead69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-09-07更新
|
1991次组卷
|
13卷引用:湖南省长沙市长郡中学2020-2021学年高三上学期入学摸底考试数学试题
湖南省长沙市长郡中学2020-2021学年高三上学期入学摸底考试数学试题湖南省长沙市长郡中学2020-2021学年高三上学期开学考数学试题(已下线)4.2.3 等差数列的前n项和(2)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)广东省广州大学附属中学等三校2021-2022学年高二上学期期末联考数学试题广东省广州大学附属中学2021-2022学年高二上学期期末数学试题(已下线)第02讲 等差数列(核心考点讲与练)-2021-2022学年高二数学考试满分全攻略(人教A版2019选修第二册+第三册)广东省揭阳市普宁市2022-2023学年高二上学期期末教学质量测试数学试题第4章 数列(培优卷)-【满分计划】2022-2023学年高二数学阶段性复习测试卷(苏教版2019选择性必修第一册)江西省寻乌中学2022-2023学年高二下学期期中数学试题(已下线)高二数学第一学期期期末押题密卷02卷(已下线)2021年新高考北京数学高考真题变式题6-10题四川省泸县第五中学2023届高考适应性考试数学(文)试题四川省泸县第五中学2023届高考适应性考试数学(理)试题
6 .
是公比不为1的等比数列
的前n项和,
是
和
的等差中项,
是
和
的等比中项,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05201ef79a5d5904f492845396fb5470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9fb008c04818c56dd78fe1f2cc16db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bf6071c209699ee6bd8e6199164617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee05c39bbbe3610c7e2b9ea95b5f4afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
7 . 已知实数
成等差数列,记直线
与曲线
的相交弦中点为
,若点
分别是曲线
与
轴上的动点,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418a39d64aac6a65b217bd36f5cd509b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49dcf4cb93c692f623a194eaf96b336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3979f27823cdcba516dfa885d8afe19d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 已知常数
,数列
满足
,
.
(1)若
,
,求
的值;
(2)在(1)的条件下,求数列
的前
项和
;
(3)若数列
中存在三项
、
、
(
、
、
且
)依次成等差数列,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abd313d4e92a762fb7fb0c1cb65263d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95089d5dbbdf37bd78fcec40684bf44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7bdaaf8b0adf10bf2ef6c1255b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194b8ab194c7d299d5c3e0f09ec18384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
(2)在(1)的条件下,求数列
![](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)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5566b1d828acdac47fe50216d247cfac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93301f9e8004bf6c59804e1ae601bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8705064bb1ac4934b21bb5a01eff6c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6b6467f94bbc9916e47bade380929b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1281d24161c9e1569c7aae6c42bb513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ef8f1681970934d020606db931dc00.png)
您最近一年使用:0次
2020-10-07更新
|
379次组卷
|
5卷引用:2019年上海市格致中学高三上学期第一次检测数学试题
名校
解题方法
9 . 已知等差数列
中,
,
,又
,
,其中
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36c991ead895bd324c9d9122061c6e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e531e77daca6a6c142e30ebaeb1f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd5a269601500792fb0588c30ad5241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fc0305945b1147722d56e876599e86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15100cab0a8f1fb3a2668fb0d20ef38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db796b223b35e52aa7b4114da8072f5.png)
A.![]() ![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
10 . 设等比数列
,
,
,
的公比为
,等差数列
,
,
,
的公差为
,且
,
.记
.
(1)求证:数列
,
,
不是等差数列;
(2)设
,
.若数列
,
,
是等比数列,求
关于
的函数关系式及其定义域;
(3)数列
,
,
,
能否为等比数列?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45482d31d1d7448c9f3922b4d2a55331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84b434b39b4689e34b27b7d560077ce.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db84454f051d418a4904fa423ab8b304.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d9b6c86435e0ceff94d8ad1cd03737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db84454f051d418a4904fa423ab8b304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db84454f051d418a4904fa423ab8b304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fdd7e9cd5d1764bc5de8add15700ae.png)
您最近一年使用:0次
2020-08-21更新
|
58次组卷
|
5卷引用:江苏省南通、徐州、扬州等六市2018届高三第二次调研(二模)测试数学(文理)试题
江苏省南通、徐州、扬州等六市2018届高三第二次调研(二模)测试数学(文理)试题江苏省苏北六市2018届高三第二次调研测试数学(文科)试题(已下线)专题20 与数列有关的恒成立问题-2018年高考数学(理)母题题源系列(江苏专版)(已下线)专题6.5 高考解答题热点题型---数列的综合应用-2021年高考数学(理)一轮复习-题型全归纳与高效训练突破江西省抚州市东乡区实验中学2022-2023学年高二下学期期中数学试题