名校
解题方法
1 . 设数列
的前n项和为
,且
,
.
(1)求数列
的通项公式:
(2)设数列
的前n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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.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
名校
2 . 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/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/3ec5876debe2d19fc86125efcf9003d0.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea49f8a2b98b542b1ebb2ac813346c90.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/85849759030b70f4645bc3fdd2721e22.png)
您最近一年使用:0次
2017-09-14更新
|
1951次组卷
|
7卷引用:甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(文)试题
甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(文)试题2020届江苏省南通市如皋中学高三创新班下学期4月模拟考试数学试题江苏省盐城市第一中学2020届高三下学期第一次调研考试数学试题江苏省海安县2018届高三上学期第一次学业质量测试数学试题江苏省徐州市第三中学2017~2018学年度高三第一学期月考(理科)数学试卷(已下线)《2018届优等生百日闯关系列》【江苏版】专题二 第六关 以新定义数列为背景的解答题(已下线)第02章+章末复习课(重点练)-2020-2021学年高二数学十分钟同步课堂专练(人教A版必修5)
名校
解题方法
3 . 已知△ABC的内角A,B,C所对的边分别为a,b,c,且
.
(1)若
,求证:△ABC是等边三角形;
(2)若△ABC为锐角三角形,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e25417ad713e8a494c70da79612b3cc3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef1f53a44614a8e672d6093786cd52c.png)
(2)若△ABC为锐角三角形,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ecc3aaae2aa289591a3b632f1e0645.png)
您最近一年使用:0次
4 . 已知数列
满足
,
.
(1)证明:数列
是等比数列;
(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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e1c9c3c7637fd5bc7af73e166050ad.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b9192a77a75259650dea7a93fef415.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)
您最近一年使用:0次
2023-05-13更新
|
712次组卷
|
4卷引用:甘肃省2023届高三第三次高考诊断考试理科数学试题
甘肃省2023届高三第三次高考诊断考试理科数学试题四川省成都市成华区某重点校2023届高三阶段性考试(三)暨高考模拟考试数学(理)试题四川省成都市成华区某重点校2023届高三阶段性考试(三)暨高考模拟考试数学(文)试题(已下线)广东省广州市中山大学附属中学2024届高三上学期期中数学试题变式题15-18
名校
解题方法
5 . 已知数列
是公差不为零的等差数列,
,且
.
(1)求数列
的通项公式;
(2)若数列
的前n项和为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a0eecb5b800fce9ae10aed86ffee62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5731f65834e58bb01c8d21a695e395ce.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](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/f1cb91e89800a81f4d62ed75c3ace24a.png)
您最近一年使用:0次
2023-09-12更新
|
563次组卷
|
2卷引用:甘肃省临夏回族自治州2022届高三一模数学(文)试题
解题方法
6 . 在
中,角
所对的边分别为
.
(1)证明
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e13289528eaf2f29a800c01d4c85ba.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83577a7a75ed110d15d9b61f27810d4c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016a1917bb7afbdc6929614ebd4b297d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
7 . 在数列
中,
.
(1)求证:
是等差数列,并求数列
的通项公式;
(2)满足不等式
成立的k的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c90c1f8a74d14a2ba57d0498572b4ff.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)满足不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d1a036d5ab92fb249d31b67d4cf28c2.png)
您最近一年使用:0次
2023-02-25更新
|
796次组卷
|
3卷引用:甘肃省兰州市第五十八中学教育集团2022-2023学年高三下学期2月建标考试数学(理科)试题
名校
解题方法
8 . 在数列
中,
.
(1)求证:
是等差数列,并求数列
的通项公式.
(2)设
,求数列
的前n项的和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2775c28fa7fa209f2a0d3fe8b3747122.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b35b20d625d7ec24531a0a6619f7683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2023-02-25更新
|
983次组卷
|
3卷引用:甘肃省兰州市第五十八中学教育集团2022-2023学年高三下学期2月建标考试数学(文科)试题
9 . 如图所示的五边形
中
是矩形,
,
,沿
折叠成四棱锥
,点
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/10e61739-f460-4d4e-9a27-045a0bd7dcef.png?resizew=277)
(1)在四棱锥
中,可以满足条件①
;②
;③
,请从中任选两个作为补充条件,证明:侧面
底面
;(注:若选择不同的组合分别解答,则按第一个解答计分.)
(2)在(1)的条件下求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6718857e3473b4dbe7c14b2a24612ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4cab41e3c3e1b04f0cff21aca315238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6735fcb2c31905447b45697c55a1a16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/10e61739-f460-4d4e-9a27-045a0bd7dcef.png?resizew=277)
(1)在四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8300bca7b13f8487061c5d6d2e82802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4f62d0920718d32974ccc06b1bf6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f9f450a27660b0996a5f8003c47f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在(1)的条件下求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
您最近一年使用:0次
10 . 设等比数列
的前
项和为
,已知
,且
.
(1)求
的通项公式;
(2)设
,数列
的前
项和为
,证明:当
时,
.
![](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/4ccdc17b603871d20843ffccca2df0ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc0907b368c213b5c34aa470824d398.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557bedc26a30ae15509ddca0926619c7.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5d0a73f50b3e4583f1c1b6d6bf0d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f334f99feea517f1844f306b5b491b11.png)
您最近一年使用:0次
2023-03-03更新
|
920次组卷
|
8卷引用:甘肃省武威市2023届高三第一次联考数学(文)试题