解题方法
1 . 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
解题方法
2 . 已知数列
中
,其前
项和记为
,且满足
.
(1)求数列
的通项公式;
(2)设无穷数列
,
,…
,…对任意自然数
和
,不等式
均成立,证明:数列
是等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.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/f085575b5c456ae641143d2d430458b0.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7121ac4377ec9bcd071cb259678ab071.png)
(2)设无穷数列
![](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/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402b8223a5be456f2acb45f65648eb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
您最近一年使用:0次
2023-03-16更新
|
642次组卷
|
3卷引用:江苏省南京市中华、东外、镇江三校2022-2023学年高三下学期3月联考数学试题
江苏省南京市中华、东外、镇江三校2022-2023学年高三下学期3月联考数学试题广东省韶关市武江区广东北江实验学校2022-2023学年高二下学期第一次(3月)月考数学试题(已下线)第4章 数列 单元综合检测(重点)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)
名校
解题方法
3 . 已知函数
.
(1)若
,且
在区间
恒成立,求
的取值范围;
(2)当
,
时,求证:在区间
至少存在一个
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80a126420532d7b9abd59d163436fb4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71eda28755639d00f9d24b95679d9496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3417699eb4a32521b7ff1f7b2a1d5f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ed0edaebe95e5347b44806e166d0e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a03974ef6cb941dea8f00a172e8b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c275d203295b989c129101d82e74ae01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1055a901cc9598d4bf9fb42144ce6d.png)
您最近一年使用:0次
解题方法
4 . 三棱柱
中,侧面
底面
,
,
,
,
,
是棱
上的一点,过
的平面与
相交于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/fb9719f5-9880-4928-a72a-1ae4c6459d05.png?resizew=196)
(1)求证:
;
(2)若
是
的中点,求证:平面
平面
;
(3)求证:
与平面
不垂直.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16cfb38323095090b0fe5eee70b24210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecf0d955692e3ddacbda6035c70a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ee2744394bfbfbeefbb9550d4706c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/fb9719f5-9880-4928-a72a-1ae4c6459d05.png?resizew=196)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26913705e6c9f6e6844dbe59f8e869fb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610f5493bdd40d7865d53984dfb31f4e.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641d9688e81760c02d0dfc4ba015afb1.png)
您最近一年使用:0次
2021-08-15更新
|
478次组卷
|
4卷引用:江苏省徐州市沛县2021-2022学年高一下学期第二次学情调研数学试题
江苏省徐州市沛县2021-2022学年高一下学期第二次学情调研数学试题北京市延庆区2020-2021学年高一下学期期末考试数学试题(已下线)第四章 立体几何解题通法 专题一 反证法 微点3 立体几何中的反证法综合训练【培优版】(已下线)第四章 立体几何解题通法 专题一 反证法 微点2 立体几何中的反证法(二)【培优版】
5 . 列三角形数表
![](https://img.xkw.com/dksih/QBM/2021/7/13/2763481566658560/2777724325470208/STEM/d4943adf-9d35-4ddb-8d25-f1ac7c95aec4.png?resizew=348)
假设第
行的第二个数为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ff13d941d09175aad24d1b14aeaddf1.png)
(1)归纳出
与
的关系式并求出
的通项公式;
(2)求证:数列
中任意的连续三项不可能构成等差数列.
![](https://img.xkw.com/dksih/QBM/2021/7/13/2763481566658560/2777724325470208/STEM/d4943adf-9d35-4ddb-8d25-f1ac7c95aec4.png?resizew=348)
假设第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ff13d941d09175aad24d1b14aeaddf1.png)
(1)归纳出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ab8426339cd9c1b56a5badf342172b.png)
您最近一年使用:0次
2021-08-02更新
|
181次组卷
|
2卷引用:江苏省苏州市常熟中学2021-2022学年高二上学期10月阶段学习质量检测数学试题
名校
解题方法
6 . 已知数列
满足:
,
,记数列![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1611adfc0ea2d5759fa89e76e67d17b0.png)
,
(1)证明数列
是等比数列;
(2)求数列
的通项公式;
(3)是否存在数列
的不同项
使之称为等差数列?若存在,请求出这样的不同项
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe1bf39b17374d700a215605b5a3df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f0082374cc939bcdf1c1787216c03c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1611adfc0ea2d5759fa89e76e67d17b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d986757e59ac7806c59eac69501fa7a9.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
(3)是否存在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d147c026e99d0363366b8f9a6b3387d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d147c026e99d0363366b8f9a6b3387d.png)
您最近一年使用:0次
2020-10-18更新
|
201次组卷
|
5卷引用:江苏省南通市第一中学2020-2021学年高二上学期10月月考数学试题
江苏省南通市第一中学2020-2021学年高二上学期10月月考数学试题江苏省南通市通州区金沙中学2020-2021学年高二上学期12月份阶段测试数学试题(已下线)考点57 推理与证明-备战2021年高考数学(理)一轮复习考点一遍过 (已下线)考点49 推理与证明-备战2021年高考数学(文)一轮复习考点一遍过(已下线)广东省2022届高三一模数学试题变式题17-22
7 . 已知数列
的前
项和为
,把满足条件
的所有数列
构成的集合记为
.
(1)若数列
通项为
,求证:
;
(2)若数列
是等差数列,且
,求
的取值范围;
(3)若数列
的各项均为正数,且
,数列
中是否存在无穷多项依次成等差数列,若存在,给出一个数列
的通项;若不存在,说明理由.
![](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/0685ae037fd0aa7e3880d4e6eb811ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78a26e3eeac053424c52ab90f6a3490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1a641ee8906e6b3b1c2103be75c418.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6a0be735ff99ec17214e79fab3b8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5f42cec86c666af6a37956335c79b3.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1a641ee8906e6b3b1c2103be75c418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723971083154cae2be17fbfbf8e931fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
8 . (1)若
,
都是正实数,且
,求证:
与
中至少有一个成立.
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91334033e0babf460d9cf69a80ca5341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae4c9aeb8769b59d3c541412789f1e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dde24489e0066f2351165f90e361d8b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9feeeae55d268f6168f33f4efa6e145.png)
您最近一年使用:0次
2018-11-15更新
|
751次组卷
|
4卷引用:江苏省沭阳县修远中学2017-2018学年高二上学期第二次月考数学试题
9 . (1)已知
,求证:
;
(2)求证:
不可能是一个等差数列的中的三项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ac12138178cb539a9e1c8f77587038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a4e187aa56f7e0e887f8361c4592ad.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f55165522324867058605cc7e21989.png)
您最近一年使用:0次
2018-05-21更新
|
312次组卷
|
2卷引用:江苏省宿迁市沭阳县修远中学2018-2019学年高二下学期第二次月考数学(文)试题
10 . 已知数列
满足:
,
,
;数列
满足:
.
(1)求数列
,
的通项公式;
(2)证明:数列
中的任意三项不可能成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da5b391236b01506c4dd47abce906db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358175aa6995341d764f4fd01c40f698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0712a0679c53428e4a901d0e623b8b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9edc3ba50573576bcc89f2fdec5f1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
(2)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
您最近一年使用:0次
2018-06-24更新
|
402次组卷
|
3卷引用:江苏省南通市通州区2020-2021学年高三上学期第三次调研考试数学试题