1 . 2022年10月16日上午10时,中国共产党第二十次全国代表大会在北京人民大会堂隆重开幕.某单位组织全体党员在报告厅集体收看党的二十大开幕式,认真聆听习近平总书记向大会所作的报告.已知该报告厅共有15排座位,共有390个座位数,并且从第二排起,每排比前一排多2个座位数,则最后一排的座位数为( )
A.12 | B.26 | C.40 | D.50 |
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2 . 若等比数列
的公比为
,前
项和为
,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.若![]() ![]() |
B.当![]() ![]() ![]() |
C.三个数![]() |
D.当![]() ![]() ![]() |
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3 .
国家号召全民健身口号中提到:“儿童健身,天真活泼;青年健身,朝气蓬勃.”提倡学生走向操场、走进大自然、走到阳光下.为弘扬运动精神,潜江中学特地每天开展课外文体活动.学校操场可供
名学生运动,每周四有踢毽子、《本草纲目》健身操两种运动可供选择,经过调查发现,凡是这周选踢毽子的,下周会有
的改选健身操;而选健身操的,下周会
改选踢毽子.用
分别表示在第
周选踢毽子的和健身操的人数,如果
,且
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d01dd350dc95f42f1883e0cc7aae084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abb59695562b3a1295a251dc97da700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51efd0ca4b6c3d42afdc6b8feb330a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ee628efd6b2f7296c106dd5cbae42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55e03428497ac0ea2aa80fe5bdcd939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08d77ccc2b8179d91099bcb8318afa2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fdb8682563de87b9ee72168caaf8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e84bbc85887baf2c01afa80b0d5cc24b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-05-20更新
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539次组卷
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2卷引用:重庆西南大学附属中学校2023届高三上学期第三次月考数学试题
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4 . 数列
前n项和为
,若
满足:
,均有
,且
,则称数列
为“和非负”数列.数列
为有且仅有6项的“和非负”数列,则这样的数列
的个数为( )个
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5141a5b907f5ff11bbd7cacbd7b5db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59256ec5ee1e6671ccbb7e3909f37f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af41f69faa99e847ee18d2de283542aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
A.20 | B.24 | C.28 | D.30 |
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解题方法
5 . 写出一个数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
____________ ,使它同时满足下列条件:①
,②
,其中
是数列
的前
项和.(写出满足条件的一个答案即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a5945ce5c2114af8c18718ca8dc899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79760b0488264a149ac7efb7a4955be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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6 . 已知数列
、
都是公差不为0的等差数列,设
,
,则关于数列
和
,下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d44ddab6e0c60119be69985ae7fa65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d1185449c051b1370380bbe217b83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
A.数列![]() |
B.数列![]() |
C.给定![]() ![]() ![]() |
D.给定![]() ![]() ![]() |
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7 . 如图给出了3层的六边形,图中所有点的个数
为28,按其规律再画下去,可以得到
层六边形,则
可以表示为( )
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728579158622208/2800345819947008/STEM/34706061-4cea-415a-b39c-1b0e42c43ecb.png?resizew=301)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728579158622208/2800345819947008/STEM/34706061-4cea-415a-b39c-1b0e42c43ecb.png?resizew=301)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-09-03更新
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490次组卷
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4卷引用:重庆市缙云教育联盟2021-2022学年高一上学期12月月考数学试题
重庆市缙云教育联盟2021-2022学年高一上学期12月月考数学试题陕西省宝鸡市金台区2020-2021学年高二下学期期中理科数学试题陕西省渭南市富平县2021-2022学年高二下学期期末文科数学试题(已下线)专题10 数列通项公式的求法 微点10 数列通项公式的求法综合训练
8 . 中国古人所使用的音阶是“五声音阶”,即“宫徵(zhǐ)商羽角(jué)”五个音,中国古代关于这五个音阶的律学理论,叫做“三分损益法”,相关记载最早见于春秋时期《管子·地缘篇》.“三分损益”包含“三分损一”和“三分益一”两层含义,“三分损一”是指将原有长度作三等分而减去其一份生得长度,“三分益一”是指将原有长度作三等分而增添其一份生得长度.具体来说,以一段圆径绝对均匀的发声管为基数——宫(称为“基本音”),宫管的“三分损一”为徵管,徵管发出的声音即为徵,徵管的“三分益一”为商管,商管发出的声音即为商,商管的“三分损一”为羽管,羽管的“三分益一”为角管,由此“宫、徵、商、羽、角”五个音阶就生成了.关于五音,下列说法中正确的是( )
A.五音管中最长的音管是商管 |
B.五音管中最短的音管是羽管 |
C.假设基本音的管长为81,则角管的长度为64 |
D.类比题中的“三分损益”可推算:商的“四分损一”为徵 |
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解题方法
9 . 高斯函数中用
表示不超过
的最大整数,对应的
为
的小数部分,已知数列
的前
项和为
,数列
满足
.已知函数
在
上单调递减.
(1)若数列
,其前
项为
,求
.
(2)若数列
(即
为
的小数部分),求
的最大值.
![](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/18f2754b3b1dad0794ec35a1771e1453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9f7de6534e371bc49b9086aaecb45b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4fd0783713648310475c3d49bbc73c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fcb3962a140b2c8529531c80e8a129a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3cc66a47b09bd04e29c82b55faf22.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532a06ecb2b13f27b149300e48133774.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/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c8b83cd4a06eb4c5e1510a0767340cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
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10 . 已知等比数列
的前
项和为
,且
.
(1)求
;
(2)定义
为取整数
的个位数,如
,求
的值 .
![](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/e6b981758450e9dcee6cfbe6c67c61f8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)定义
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1939710991647ab22cb5dff165b0c738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e812b69c7dc1bf485eed487a1cafe015.png)
您最近一年使用:0次
2021-06-03更新
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708次组卷
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3卷引用:重庆市长寿中学校2021届高三下学期5月考前模拟数学试题