名校
解题方法
1 . 已知数列
的前
项和为
,且
,
.
(1)若
,求数列
的前
项和
;
(2)若
,
,求证:数列
为等比数列,并求出其通项公式.
![](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/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ba7477cc35295206e79e1cb7fb4f3d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859003d7a148e04e2935e8befbca8441.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)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ae7dfe5fbb574b9c0ea1d85f402d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9591e5f1367c94a9a2b7499c3d6892d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e46493fd829e4eeed0c6153462287fa.png)
您最近一年使用:0次
2020-03-02更新
|
596次组卷
|
2卷引用:上海市浦东新区2018届高三下学期质量抽测(5月)数学试题
19-20高三上·上海浦东新·期中
名校
解题方法
2 . 已知定义在
上的函数
和数列
满足下列条件:
,当
且
时,
且
,其中
均为非零常数.
(1)数列
是等差数列,求
的值;
(2)令
,若
,求数列
的通项公式;
(3)证明:
数列是等比数列的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52f8b9a9b16a01718a7e32244967966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13ee40e6cfa757f60396a5a93202c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25598fabdfa6d42d9a0005d93c5c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1154f6a25bf87c6a1096794395dff17.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada7ecff631089128d70bb264b73df9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dbe1cbc9299a7d10f69a1caf290933.png)
您最近一年使用:0次
2020-02-29更新
|
527次组卷
|
3卷引用:上海市华东师范大学第二附属中学2020届高三上学期期中数学试题
(已下线)上海市华东师范大学第二附属中学2020届高三上学期期中数学试题2020届湖北省华中科技大学第二附中高三上学期期中数学试题江苏省泰州市姜堰中学2020-2021学年高二上学期阶段测试一数学试题
3 . 已知数列
满足:,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c1469296c113645ed855fda4badee9.png)
,其中
表示不超过实数
的最大整数,设
为实数,且对任意的正整数
,都有
(其中符号
为连加号,如
),则
的最小值是__________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c1469296c113645ed855fda4badee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52227e660b1301ddc2c2e46d21fe04da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a22b410d4d76369c7b53ecd7c65aafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cf3fa0d9e0ed167bc03b43f3de24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e673b40143ef064351c10ff093eddec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
4 . 定义:对于一个项数为
的数列
,若存在
且
,使得数列
的前k项和与剩下项的和相等(若仅为1项,则和为该项本身),我们称该数列是“等和数列”.例如:因为
,所以数列3,2,1是“等和数列”.请解答以下问题:
(1)数列1,2,p,4是“等和数列”,求实数p的值;
(2)项数为
的等差数列
的前n项和为
,
,求证:
是“等和数列”.
(3)
是公比为q项数为
的等比数列
,其中
且
恒成立.判断
是不是“等和数列”,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb8ed53d63acbc84f971bf27e03b854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e36bff57bcfa86432b340e25e51d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfae43a1ea1f5f3a031d224ac61a5f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df3727c94ac7dd40a1167fbefe77555.png)
(1)数列1,2,p,4是“等和数列”,求实数p的值;
(2)项数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084560d2f7832c82cea659b4be76bf8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82078fcb4aeffb2fb56924507739f33e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59cafa2aa63beea36dec11d61a1ddb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26327328443a6e65db56cf4d1254b011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699e55c211a6e091cc7a9d2cde3ed981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a38c773b8a5cccaf44ccc24e4fb7cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
名校
解题方法
5 . 在
中,角
的对边分别为
,
.
(1)若
,
,求a;
(2)若
,求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5f33fd9ec988aaddd8f4c82f960c37.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18af922d7bcd7a1bfbd89398d86eda5c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b117c0e2c7a70c00ad56675598f77f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
6 . 《《周髀算经》有记载:一年有二十四个节气,每个节气晷(gui)长损益相同,晷是按照日影测定时刻的仪器,晷长即所测定的影子的长度,二十四节气及晷长变化如图所示,相邻两个节气晷长变化量相同,周而复始,若冬至晷长最长是一丈三尺五寸,夏至晷长最短是一尺五寸,(一丈等于10尺,一尺等于10寸),则秋分节气的晷长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/1e1057a3-4ce1-48ee-bcde-55cc6f562f5a.png?resizew=295)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/1e1057a3-4ce1-48ee-bcde-55cc6f562f5a.png?resizew=295)
A.七尺五寸 | B.二尺五寸 | C.五尺五寸 | D.四尺五寸 |
您最近一年使用:0次
2020-02-29更新
|
301次组卷
|
3卷引用:上海市金山中学2020届高三上学期期中数学试题
上海市金山中学2020届高三上学期期中数学试题(已下线)第24讲 等差数列及其前n项和-2021年新高考数学一轮专题复习(新高考专版)江西省新余市第一中学2019-2020学年高一下学期第二次月考数学试题
名校
7 . 已知数列
满足:对任意大于1正整数n都有
成立,若
,
,则
的值为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0323e1202a25a7136ea11c0777a43bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4123422b5a6621da6a3214aa8c3e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ad8f29672ebb40d03b38c2313ab064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff5f407e53b4e90157c9435f272eb4d.png)
您最近一年使用:0次
名校
解题方法
8 . 在下列命题中:①在
中,
,
,
,则解三角形只有唯一解的充要条件是:
;②当
时,
;③在
中,若
,则
中一定为钝角三角形;④扇形圆心角
为锐角,周长为定值,则它面积最大时,一定有
;⑤函数
的单增区间为
,其中真命题的序号为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b86d43790babcdbbdc03493ee70928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d39e8c6fc9149d6290c493a65bdc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbf7575ec7f9c22f3b51084fe190b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc18e9d81eaa4c0e25f92b497058d9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047056c99b39c70fa40d3c8178e5b631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72243f88f9041df51a76f7b2dd0fdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f44641a1d73c24b9b69145f312ca70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb80c0e955d5be2a4af9006d36347b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7814b93320e57e95ca4a1d80f87c4b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37ff6a9a24078fdd7bf21c180e40d78.png)
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2011·上海静安·一模
名校
解题方法
9 . 如图,在梯形
中,
相交于O,记
,
,
的面积分别为
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff36ac07c45c8d03cf3b7d8739c517ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e909b44f49fb2d1cacd9ffb78b30b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532684511ddb43fbebc5ae0694f8b209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf4e20ea341827ce5f9552daee39462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b52223361d221199949194e21c73a88.png)
![](https://img.xkw.com/dksih/QBM/2020/2/28/2408954451369984/2409006005739520/STEM/cc34a724-d4e7-4bb9-b487-8cbd69521202.png)
您最近一年使用:0次
2020-02-28更新
|
284次组卷
|
7卷引用:上海市七宝中学2020届高三上学期11月月考数学试题
上海市七宝中学2020届高三上学期11月月考数学试题(已下线)2011届上海市静安区高三下学期质量调研考试数学理卷(已下线)2011届上海市宝山区高三第二次模拟测试理科数学卷(已下线)专题08+基本不等式及其应用-2020-2021学年新教材高一数学秋季辅导讲义(沪教版2020)上海市七宝中学2021-2022学年高一上学期期中数学试题上海市嘉定区中光高级中学2022-2023学年高一上学期期中数学试题(已下线)2014年人教A版选修四4-1第一讲1.1练习卷
10 .
是
的展开式各项系数的和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89fd6b0b0e3b9dda9bfdf945f29f43d.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afc2d9519b86f62a568b3dbe4acbbd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89fd6b0b0e3b9dda9bfdf945f29f43d.png)
您最近一年使用:0次