名校
1 . 已知数列{
}的前n项和为Sn,
,且对任意的n∈N*,n≥2都有
.
(1)若
0,
,求r的值;
(2)数列{
}能否是等比数列?说明理由;
(3)当r=1时,求证:数列{
}是等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cd2decc0478b099a56ed5d95bfac30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07cf3b53d086e0f1e0a41b39235d7c51.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce86d958c7ca472f25a7a53581bd0a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233ede8e2b7ddd6807e67d974b7370ae.png)
(2)数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(3)当r=1时,求证:数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
您最近一年使用:0次
2019-02-01更新
|
1557次组卷
|
6卷引用:【市级联考】江苏省泰州市2019届高三上学期期末考试数学试题
【市级联考】江苏省泰州市2019届高三上学期期末考试数学试题江苏省泰州中学2020届高三上学期开学考试数学(文)试题1江苏省泰州中学2020届高三上学期开学考试数学(文)试题2(已下线)专题13 等差、等比数列的应用-《巅峰冲刺2020年高考之二轮专项提升》(江苏)(已下线)专题05 等差数列和等比数列的证明问题(第二篇)-备战2020年高考数学大题精做之解答题题型全覆盖江苏省泰州市2019届高三下学期第一次模拟数学试题
2 . 已知等差数列
的前![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e431d92c5041fa44373c9df45c7309f.png)
(1)求数列
的通项公式
(2)设
,求证:数列
是等比数列
(3)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/2018/10/15/2053983035162624/2058633075965952/STEM/177e26e499c1456a983466b18ef7abb4.png?resizew=4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e431d92c5041fa44373c9df45c7309f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f66c09c64def5039fc5cd229e9f606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dffdf7bb57355908eb46a872e3a3c318.png)
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3 . 已知等差数列
中,
.
(1)设
,求证:数列
是等比数列;
(2)求
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8853534b653fc4049eda1f07dcfcc9e9.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c394d7bd6be49f089aa78d2d4fd0a9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解题方法
4 . 已知椭圆
:
的左、右焦点分别为
,
,点
在椭圆
上,满足
.
(1)求椭圆
的标准方程;
(2)直线
过点
,且与椭圆只有一个公共点,直线
与
的倾斜角互补,且与椭圆交于异于点
的两点
,
,与直线
交于点
(
介于
,
两点之间).
(i)求证:
;
(ii)是否存在直线
,使得直线
、
、
、
的斜率按某种顺序能构成等比数列?若能,求出
的方程;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dfb290b1a84f670549554a0c988593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc47b02d4b4bedf20be6a0885a128d50.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(i)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649769e2756d735514e35a513f4c4622.png)
(ii)是否存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
您最近一年使用:0次
2018-04-04更新
|
632次组卷
|
3卷引用:四川省成都市龙泉驿区第一中学校2018届高三3月“二诊”模拟考试数学(文)试题
5 . 在△ABC中,内角
所对的边分别为
,已知
.
(Ⅰ)求证:
成等比数列;
(Ⅱ)若
,求△
的面积S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc58e5d3f9ec18c5e8960584e7549a6.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4551fc4199b2bf3e0370e9b5633eb3ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2019-01-30更新
|
3481次组卷
|
20卷引用:2012年全国普通高等学校招生统一考试文科数学(山东卷)
2012年全国普通高等学校招生统一考试文科数学(山东卷)(已下线)2013-2014学年河南省濮阳市高二下学期升级考试文科试卷(A卷)(已下线)2013-2014学年河南省濮阳市高二下学期升级考试文科数学试卷(A)(已下线)2013-2014学年安微省黄山市屯溪一中高一下学期期中考试数学试卷(已下线)2014-2015学年福建省德化一中高二上学期第一次检查文科数学试卷2015届吉林省长春十一中高三上学期第二次测试理科数学试卷2015届吉林省长春市十一中高三上学期第二次测试文科数学试卷2014-2015学年福建省德化一中高二上学期第一次质检文科数学试卷2015届吉林省长春市十一高中高三上学期阶段性考试理科数学试卷2015届吉林省长春市十一高中高三上学期阶段性考试文科数学试卷2014-2015学年安徽省凤阳中学高一下学期期中考试数学试卷2015-2016学年山东省枣庄三中高二上学情调查理科数学卷2016-2017学年河北省张家口市第一中学高二(衔接文科班)3月月考数学试卷2017届广西桂林市桂林中学高三2月月考数学(文)试卷人教A版 成长计划 必修5 第一章正弦定理和余弦定理 1.2 应用举例云南省昆明市东川区明月中学2018-2019学年高一下学期期中考试数学试题山西省新绛县第二中学2019-2020学年高二上学期11月月考数学(文)试题山西省新绛县第二中学2019-2020学年高一下学期6月月考数学试题新疆乌鲁木齐第七十中学2017-2018学年高一下学期期中数学试题(已下线)模块二 专题2 解三角形与数列
6 . 设数列
的前 n 项和为 Sn ,且(3-m)Sn+2man=m+3(n∈N*) ,其中 m 为常数,且 m≠-3 .
①求证:
是等比数列;
②若数列
的公比为q=f(m) ,数列 {bn} 满足 b1=a1 ,bn=
f(bn-1)(n∈N*,n≥2) ,求证:
为等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
②若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0e7bfbd56fe73dfe04c04da749d942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ff9e99fdb1ec0cbf6a907e45f7f2c5.png)
您最近一年使用:0次
名校
7 . 已知数列
,其前
项和为
,满足
,
,其中
,
,
,
.
⑴若
,
,
(
),求证:数列
是等比数列;
⑵若数列
是等比数列,求
,
的值;
⑶若
,且
,求证:数列
是等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b522388939925a790a0efa50429506b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e958c81b39ef379218f82181db54c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f56a22d95eab351e09da1afb8153bb.png)
⑴若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558e11d700481dc414d5d073b4b88a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60687d94e4c6a77a491699e6e5307d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dad87249fecca00355127c0c60a5d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
⑵若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
⑶若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbd4598903816fc5fe7a4042a0e2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
2018-02-22更新
|
752次组卷
|
8卷引用:江苏省宿迁市2018届高三上学期第一次模拟考试数学试题
8 . 已知在正项数列{an}中,a1=2,点An(
,
)在双曲线y2-x2=1上.在数列{bn}中,点(bn,Tn)在直线y=-
x+1上,其中Tn是数列{bn}的前n项和.
(1)求数列{an}的通项公式;
(2)求证:数列{bn}是等比数列;
(3)若cn=anbn,求证:cn+1<cn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051570bbea0a7289c3776e81cad90c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49b4835c4cd402232ba87fd8a9295d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求数列{an}的通项公式;
(2)求证:数列{bn}是等比数列;
(3)若cn=anbn,求证:cn+1<cn.
您最近一年使用:0次
9 . 已知数列{
满足
,
.
(1)求证:数列
是等比数列;
(2)若数列
是单调递增数列,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde236c2fa2783eb99f1d349792c9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cd277da1d12b1346e7bc0ac93a660d.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abff66b381183dbc0086b867f93f3fbd.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9faeed172ec5b88966b0d1c52748d41.png)
您最近一年使用:0次
2018-01-19更新
|
741次组卷
|
5卷引用:辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校2017-2018学年高二上学期期末考试数学(理)试题