1 . 意大利画家达·芬奇提出:固定项链的两端,使其在重力的作用下自然下垂,那么项链所形成的曲线是悬链线.1691年,莱布尼茨等得出悬链线可为双曲余弦函数
的图象,类似的可定义双曲正弦函数
.它们与正、余弦函数有许多类似的性质.
(1)类比正弦函数的二倍角公式,请写出(不证明)双曲正弦函数的一个正确的结论:
________;
(2)当
时,比较
与
的大小,并说明理由;
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2b368b26ace6c7aa1babc747110b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a6271387d2be177a6561863df3de01.png)
(1)类比正弦函数的二倍角公式,请写出(不证明)双曲正弦函数的一个正确的结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0604613fa3ea938e6354254e3d99d8.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd76ea82cac9d90033c324f145e13e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5890d8b411cc9c2f0884e4b1f03f5e0c.png)
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名校
2 . 18世纪早期英国牛顿学派最优秀代表人物之一的数学家泰勒(Brook Taylor)发现的泰勒公式(又称夌克劳林公式)有如下特殊形式:当
在
处的
阶导数都存在时,
.其中,
表示
的二阶导数,即为
的导数,
表示
的
阶导数.
(1)根据公式估计
的值;(结果保留两位有效数字)
(2)由公式可得:
,当
时,请比较
与
的大小,并给出证明;
(3)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f1d8cb672db61735be7cbcd3d50bf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da96b7541c18146aefc0d80291186d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10acd6d864583617dd3e71240bf0c857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35993bd1db970330494665d925c0be7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)根据公式估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c849c99d2679990ea508828dd84b72b4.png)
(2)由公式可得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f07a4e5e6bdc4b4a4eaa34158e8dad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc8c56d09485b718a85ed23f637e2d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a31d549e3378ada5b76df20395bc0f.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fe57d5d39fa2966fcf732f33b1bc0a.png)
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3 . 差分法的定义:若数列
的前
项和为
,且
,则
时,
.例如:已知数列
的通项公式是
,前
项和为
,因为
,所以
.
(1)若数列
的通项公式是
,求
的前
项和
;
(2)若
,且数列
的前
项和分别为
,证明:
.
![](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/314fa1f4da470780673cc7246974180c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9361afc7cc02253140585eedc39a695d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677e46ecd051c92489c0d1d458932f37.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/e3bd2e55bb083a90ecba8cc98fac9536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237ce153a42d4e2378d5435051734cb3.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd845d1bfac72200926447db04563fc.png)
![](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)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77af844c4444e536adae9bc0b1cff614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04f062dc12653209868713f2142fe06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1c51f15c934050099b460b19a04f4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038e3af7c9f2fb642b9209415662aeff.png)
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2024-05-30更新
|
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|
2卷引用:黑龙江省伊春市铁力市第一中学校2023-2024学年高二下学期期中考试数学试卷
解题方法
4 . 已知数列
满足
,
,且
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6194b7839446c93adc1b49aefb9d7214.png)
A.![]() ![]() |
B.![]() |
C.![]() |
D.![]() ![]() ![]() |
您最近一年使用:0次
5 . 高斯是德国著名数学家,近代数学的奠基者之一,享有“数学王子”的称号,用他名字定义的函数
称为高斯函数,其中
表示不超过x的最大整数,如
,
,已知数列
满足
,
,
,若
,
为数列
的前n项和,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1550a97c21c1d71c9e95dde569668be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d54a0e82778f606d95a486835ac9f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f2323cbdf0b1b71092c962ae705102.png)
![](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/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d845281cd834068104af1b1aa6027c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7231e303ae39572f6c359c5e83822075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5735a391a46cfdbd63e171769f8abb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c3ac959bdf1b78cb98d92b87c91c46.png)
A.2026 | B.2025 | C.2024 | D.2023 |
您最近一年使用:0次
2023-11-25更新
|
929次组卷
|
7卷引用:江西省吉安市双校联盟2022-2023学年高二下学期期中考试数学试题
江西省吉安市双校联盟2022-2023学年高二下学期期中考试数学试题云南省曲靖市第一中学2022-2023学年高一下学期7月期末考试数学试题内蒙古赤峰市赤峰二中2024届高三上学期第三次月考数学(理)试题(已下线)第五章 数列 专题8 数列中的递推(已下线)第五章 数列 专题7 有关数列求通项、周期性求和的问题陕西省西安市西安中学2024届高三上学期期末数学(理)试题(已下线)4.3.2 等比数列的前n项和公式——课后作业(巩固版)
名校
解题方法
6 . 已知
.
(1)求函数
的极值;
(2)求证:对任意正整数n,有
;
(3)记
,求整数a,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f7a8c86a8a7c5cebc2905e5a772fcd.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)求证:对任意正整数n,有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ab9e75c05941a87cff4e159361fda4.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff6e011d2607acfee1a2c9670a9e34d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437fd9da6a79d8c2474c3ae1274bf9c7.png)
您最近一年使用:0次
7 . 对于数列
,若存在正数M,使得对一切正整数n,都有
,则称数列
为有界数列;若这样的正数M不存在,则称数列
为无界数列.下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee632cfe1cc460fbcd32b9e8a630a543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.等比数列![]() ![]() ![]() ![]() |
B.若数列![]() ![]() ![]() |
C.若正项数列![]() ![]() ![]() |
D.若数列![]() ![]() ![]() ![]() |
您最近一年使用:0次
2023-11-07更新
|
864次组卷
|
2卷引用:江苏省苏州市2023-2024学年高三上学期期中数学试题
名校
解题方法
8 . 已知函数
,
.
(1)证明:当
时,
;
(2)若
,求a的取值范围;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f78631496ef53ef1043ced059b6db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37591a5d917985e9ec9eba20c89cc37c.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85187c85826beeca12137805293fff77.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ed7d52b29661711d18ca1e9898d507.png)
您最近一年使用:0次
名校
9 . 已知当
时,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e10245aa9aa362178f8f8cc0ceaf134.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2023-04-02更新
|
2307次组卷
|
6卷引用:辽宁省沈阳市东北育才学校2022-2023学年高二下学期期中数学试题
10 . 数列
满足
,
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fab51121848ce166035ceab6f4e00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ba3f90c7c48ad9d0316b7cea3e2b7c.png)
A.若![]() ![]() ![]() |
B.若存在无数个自然数![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() |
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2022-09-24更新
|
2058次组卷
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6卷引用:福建省三校联考2022-2023学年高二上学期期中考试数学试题