1 . 记数列
中不超过正整数n的项的个数为
,设数列
的前n项的和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f6874fd059f4200d0e73c8c033855b.png)
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deca922f74f28aa9ab391cb0202a31a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](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/c8f6874fd059f4200d0e73c8c033855b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d688866fc460b1244b04be1515e5fb1.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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8卷引用:江西省2022届高三教学质量监测考试(二模)数学(理)试题
江西省2022届高三教学质量监测考试(二模)数学(理)试题江西省宜春市丰城中学2022届高三5月模拟数学(理)试题(已下线)重难点07五种数列求和方法-2(已下线)第04讲 数列求和(练)(已下线)考向20等比数列及其前n项和(重点)(学生版) - 2(已下线)考点6-2 等比数列(文理)(已下线)专题15 数列求和-3(已下线)专题04 数列(6)
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2 . 如图,将钢琴上的12个键依次记为
,
,
,
.设
.若
且
,则
,
,
为原位大三和弦;若
且
,则称
,
,
为原位小三和弦.用这12个键可以构成的原位大三和弦与原位小三和弦的个数之差为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/029b5039-e9d6-44d3-a3b2-2b26fded36c4.png?resizew=213)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e76d1d8e50dda4d50229a8a20c57e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5e8fb54c4cbb65d70227e906ea36ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7869c2159155fdf6795f0e91ae480436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbbb0a21089e349f91830d12f62d2b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb853c35a7d17396aa032e33505002f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9919b97a3823c533ec46ef299b55eb07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be85512a4fe1dfb9441db599c93ea71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb853c35a7d17396aa032e33505002f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/029b5039-e9d6-44d3-a3b2-2b26fded36c4.png?resizew=213)
A.5 | B.![]() | C.0 | D.10 |
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3 . 已知数列
为1,1,2,1,1,2,3,1,1,2,1,1,2,3,4,…,首先给出
,接着复制该项后,再添加该项的后继数2,于是
,
,然后再复制前面所有的项1,1,2,再添加2的后继数3,于是
,
,
,
,接下来再复制前面所有的项1,1,2,1,1,2,3,再添加3的后继数4,…,如此继续,则
( )
![](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/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb334e165679c6cb500c994cffa47147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2da0ff9dc73d62f8162fc3de186150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259b2e755105c0ee479eabf7265a76a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73abda0b2c65194421a02d6dc1380f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e6a1b0cf1299008b00be81b739dd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79f1fa7fa498ce7701e904b24514523.png)
A.1 | B.2 | C.3 | D.4 |
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4 . 有一个非常有趣的数列
叫做调和数列,此数列的前n项和已经被研究了几百年,但是迄今为止仍然没有得到它的求和公式,只是得到它的近似公式:当n很大时,
,其中
称为欧拉-马歇罗尼常数,
…,至今为止都还不确定
是有理数还是无理数.由于上式在n很大时才成立,故当n较小时计算出的结果与实际值之间是存在一定误差的,已知
,
.用上式估算出的
与实际的
的误差绝对值近似为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3179aafc2a53d170bc73c28a205101fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7a8423fdede862b934aa7d31ab1ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c25cea368b6187377209e052ddc54f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b7cfcc147916ae7eeb5d557fea945e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0953fad19df05e9fa3b42a745b916f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3a844d118337b249319df9f677ff68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3a844d118337b249319df9f677ff68.png)
A.0.003 | B.0.096 | C.0.121 | D.0.216 |
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8卷引用:百校大联考2022届高三3月新高考标准卷数学试题
百校大联考2022届高三3月新高考标准卷数学试题湖南省长沙市雅礼中学等十六校2022届高三下学期第二次联考数学试题湖北省宜昌市夷陵中学2022届高三下学期5月四模数学试题(已下线)数学-2022年高考押题预测卷03(新高考卷)四川省内江市第六中学2022届高三下学期考前第一次强化训练数学(文科)试题吉林省长春市绿园区长春市十一高中2022-2023学年高三上学期10月月考数学试题宁夏石嘴山市第三中学2022-2023学年高三上学期中考试数学试题(理科)(已下线)江西省九所重点中学2023届高三第二次联考联合考试数学(文)试题变式题6-10
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5 . 已知数列
,若存在一个正整数
使得对任意
,都有
,则称
为数列
的周期.若四个数列分别满足:
①
,
;
②
,
;
③
,
,
;
④
,
.
则上述数列中,8为其周期的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2b94cbf8f1acc77ed2618d9ba5756a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65dc24efb25d45066dd25aad9958996.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf7b08386d0bc9b6393d4a4e46e77be.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1ee88beaddafb0d0a185c3a8e0dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf707341083a8aa04dbf8d22a02654e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e236fc9ae30a082b4e7ef16b520cbffa.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea6578afabc23f5d7041b88c3790dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646ceaeea64ac847d43782db3f02f1ab.png)
则上述数列中,8为其周期的个数是( )
A.1 | B.2 | C.3 | D.4 |
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4卷引用:北京市朝阳区2022届高三一模数学试题
6 . 对任意正整数
定义运算*,其运算规则如下:①
;②
.则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/351539d6f28bcc1b66b171b4209f4131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33f7cb66e0072ab1e8b4fd1872e1932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27185af03d8e147d2adb5b0d8907fe6b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4卷引用:河南省2021-2022学年高二下学期阶段性测试(三)数学(理)试题
河南省2021-2022学年高二下学期阶段性测试(三)数学(理)试题河南省南阳六校2021-2022学年高二下学期期中数学(理)试题(已下线)第四章 数列(A卷·知识通关练) (4)(已下线)第五章 数列(A卷·知识通关练)(5)
名校
7 . 对于数列
,若存在正数
,使得对一切正整数
,恒有
,则称数列
有界;若这样的正数
不存在,则称数列
无界,已知数列
满足:
,
,记数列
的前
项和为
,数列
的前
项和为
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/088726808d684616b8e79c495bc9e591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.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/5a45db5d8a0994225fba569e9963d7b9.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
A.当![]() ![]() | B.当![]() ![]() |
C.当![]() ![]() | D.当![]() ![]() |
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6卷引用:浙江省温州市2022届高三下学期3月高考适应性测试数学试题
浙江省温州市2022届高三下学期3月高考适应性测试数学试题(已下线)专题12 数列(已下线)第5章 一元函数的导数及其应用 单元综合检测(难点)(练习)-2022-2023学年高二数学同步精品课堂(人教A版2019选择性必修第二册)(已下线)专题6-1 数列函数性质与不等式放缩(讲+练)-1上海市静安区回民中学2024届高三上学期12月阶段性测试数学试题(已下线)【练】专题4 数列新定义问题
8 . 对于数列
,如果
为等差数列,则称原数列
为二阶等差数列,一般地,如果
为
阶等差数列,就称原数列
为
阶等差数列.现有一个三阶等差数列,其前7项分别为1,5,11,21,37,61,
,则该数列的第7项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c65a855b1eed9c43e6829f6c3bffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c65a855b1eed9c43e6829f6c3bffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acfbe600b6693d767b3ab194f8d172f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
A.101 | B.99 | C.95 | D.91 |
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2卷引用:重庆市第八中学2021-2022学年高二下学期第一次月考数学试题
9 .
为不超过x的最大整数,设
为函数
,
的值域中所有元素的个数.若数列
的前n项和为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36304502dd9ae85a33ed38d59c655ea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d75b41d921dc7ac0ed02b4078100a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd528794eeb02c09998021d05f116c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4b5a382f920203b9ef307224ae641e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5卷引用:安徽省皖北县中联盟2021-2022学年高二下学期3月联考数学试题
名校
解题方法
10 . 已知数列
满足
,记
表示数列
的前n项乘积.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5652e05710036fea2d78f22e4d1249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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