1 . 记
为等比数列
的前n项和,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dabace330ccdd9755fbcf32d5d6343.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/9fc55f38694a72b09eb15027f8c9d8b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a7e8e7b57a40356e959d6690682dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dabace330ccdd9755fbcf32d5d6343.png)
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解题方法
2 . 寒假期间小明每天坚持在“跑步3000米”和“跳绳2000个”中选择一项进行锻炼,在不下雪的时候,他跑步的概率为
,跳绳的概率为
,在下雪天,他跑步的概率为
,跳绳的概率为
.若前一天不下雪,则第二天下雪的概率为
,若前一天下雪,则第二天仍下雪的概率为
.已知寒假第一天不下雪,跑步3000米大约消耗能量330卡路里,跳绳2000个大约消耗能量220卡路里.记寒假第
天不下雪的概率为
.
(1)求
,
,
的值,并证明
是等比数列;
(2)求小明寒假第
天通过运动锻炼消耗能量的期望.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358d1067c81a8f997a4d457088a769d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0797a4e8f5cb2a7746ce2e4ea4e81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ee628efd6b2f7296c106dd5cbae42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb00d558e456638de8ff1788db5a8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1065ae0947705c7d16a5a86c78f07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0797a4e8f5cb2a7746ce2e4ea4e81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/511cc417cb1bcacf47dbc46b584977e1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b21b872313f7d8c5b606981f954a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce446fd3cef1c88c863db76d1e653ea4.png)
(2)求小明寒假第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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3 . 已知数列
是等比数列,且
.设
,数列
的前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794e305187cc0ca7c94ba37d09afb282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
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2024-02-28更新
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4卷引用:上海市育才中学2024届高三下学期第一次调研(3月)数学试题
4 . 已知数列
,其中第一项是
,接下来的两项是
,再接下来的三项是
,以此类推,则下列说法正确的是__________ .
①第10个1出现在第46项;
②该数列的前55项的和是1012;
③存在连续六项之和是3的倍数;
④满足前
项之和为2的整数幂,且
的最小整数
的值为440
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013005459919b9ac398be22121f1e5de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdc0a3d74c8452485651263b7ea2e01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcb7bd10ee4484f509952ef417c6b27.png)
①第10个1出现在第46项;
②该数列的前55项的和是1012;
③存在连续六项之和是3的倍数;
④满足前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8219335ba5f2c42dc03393113394412e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2卷引用:上海市浦东新区上海实验学校2024届高三下学期开学考试数学试题
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5 . 已知等比数列
的前n项和为
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.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/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a937bfa81842d63375e8976f7aa889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
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6卷引用:信息必刷卷04(上海专用)
(已下线)信息必刷卷04(上海专用)上海市闵行区2024届高三下学期学业质量调研(二模)数学试卷(已下线)宁夏石嘴山市平罗中学2024届高三下学期第一次模拟考试数学(文)试题山东省济宁市2023-2024学年高二上学期期末质量检测数学试题(已下线)1.3.2 等比数列的前n项和5种常见考法归类(2)山东省淄博市桓台县渔洋中学2023-2024学年高二下学期6月阶段性检测数学试题
6 . 公差不为零的等差数列
,
,如果
成等比数列,求数列
的通项_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0dc17b42117ed5d01ba8f0219a0fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5e05db7edca604b40de6e61f9badbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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7 . 已知等比数列
的前
项和为
,公比为2,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.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/bbddd4c506ce0cb04dfb117415c682f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
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4卷引用:上海市闵行中学2024届高三下学期4月月考暨二模模拟考试数学试卷
上海市闵行中学2024届高三下学期4月月考暨二模模拟考试数学试卷上海市向明中学2023-2024学年高一上学期期末考试数学试卷(已下线)5.3.2等比数列的前n项和(分层练习,5大题型)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第三册)(已下线)1.3.2等比数列的前n项和(分层练习)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第二册)
8 . 在国家开发西部的号召下,某西部企业得到了一笔400万元的无息贷款用做设备更新.据预测,该企业设备更新后,第1个月收入为20万元,在接下来的5个月中,每月收入都比上个月增长20%,从第7个月开始,每个月的收入都比前一个月增加2万元.则从新设备使用开始计算,该企业用所得收入偿还400万无息贷款只需______ 个月.(结果取整)
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9 . 已知各项均不为零的数列
的前
项和为
,
,
,
,且
,则
的最大值为________ .
![](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/bbe7bdaaf8b0adf10bf2ef6c1255b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7fdd606e80f1f7c0a559d259d381c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc208502a66c7206fa643dc46870b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5b083c3cf55f65f882796e960f4c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addee6ce5163a2580888ce2da22714af.png)
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10 . 已知函数
.
(1)若
,求
的单调区间;
(2)若
时
恒成立,求实数a的取值范围.
(3)定义函数
,对于数列
,若
,则称
为函数
的“生成数列”,
为函数
的一个“源数列”.
①已知
为函数
的“源数列”,求证:对任意正整数
,均有
;
②已知
为函数
的“生成数列”,
为函数
的“源数列”,
与
的公共项按从小到大的顺序构成数列
,试问在数列
中是否存在连续三项构成等比数列?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3374eaf3f06eeb1ac4272d402cfa1b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcac1e85463a3177f487d896b3d1d24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acb0f1ac694dd177e99fc385f23318.png)
(3)定义函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0914c295f572c98dd043d4f84268934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9599b8c0f6a10d15f408ad651b35c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72878dfe2c7a76d76287194ac4bdf4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729b4033af5b0c9c4889406d2c8294f7.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a386e4d3f92631ed64ca3e2f5f4725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.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/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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2023-12-25更新
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4卷引用: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
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上海市浦东复旦附中分校2023-2024学年高三下学期3月月考数学试题湖南省邵阳市第二中学2024届高三下学期入学测试数学试题(已下线)第五章 导数及其应用(单元重点综合测试)-2023-2024学年高二数学单元速记·巧练(沪教版2020选择性必修第二册)