名校
解题方法
1 . 已知三棱锥
的棱长均为6,其内有
个小球,球
与三棱锥
的四个面都相切,球
与三棱锥
的三个面和球
都相切,如此类推,…,球
与三棱锥
的三个面和球
都相切(
,且
),则球
的体积等于__________ ,球
的表面积等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be77704255b3cadb7ae2a66ec35205ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28cc0f93939bfa9e1f913b18dd9d15ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be77704255b3cadb7ae2a66ec35205ec.png)
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2020-02-27更新
|
1398次组卷
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10卷引用:2020届湖北省华师一附中高三2月月考数学(理)试题
2020届湖北省华师一附中高三2月月考数学(理)试题2020届安徽省合肥市高三第一次教学质量检测数学(理)试题福建省福州市2019-2020学年高三5月调研卷理科数学试题福建省福州市2019-2020学年高三5月调研卷文科数学试题(已下线)数学-6月大数据精选模拟卷04(北京卷)(满分冲刺篇)广东省佛山市第一中学2019-2020学年高二下学期第一次段考数学试题河北正定中学2021届高三上学期第一次半月考试数学试题(已下线)专题02 数列(第二篇)-备战2020高考数学黄金30题系列之压轴题(新课标版)(已下线)专题06 立体几何(文)第二篇-备战2020高考数学黄金30题系列之压轴题(新课标版)(已下线)专题06 立体几何(理)第二篇-备战2020高考数学黄金30题系列之压轴题(新课标版)
2 . 已知
是各项均为正数的等比数列,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d22eb5c5d00cac9198092b02075e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知各项均为正数的数列{
}满足
(
N*),且
是
的等差中项.
(I)求数列{
}的通项公式
;
(II)若
,求使
成立的正整数n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b11103bd6a443922b72a702024373c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b0aafc603ba02b6702e785b00a5013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d473bfcc52ebc119430335531488a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a826ead2adf4c861699c3db58d151c6.png)
(I)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43befc950bb08161ac8a3ce23e756c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60441404a57a2ad8001542d08c98c9b7.png)
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2020-02-08更新
|
802次组卷
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6卷引用:湖北省武汉市三校联合体2019-2020学年高一下学期期中数学试题
名校
4 . 已知正项等比数列
的前
项和为
,且满足
,
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)数列
,
,
,…,
是首项为1,公比为2的等比数列,记
,求数列
的前
项和
.
![](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/5cf1055b5cd61b001c0d82718c41f708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61626d0af1da5d95c2e28fba0a7d71c.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45aec1e4ca31a14444f4bc8682ab5d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085a37c2996e097b38235498876dadbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb523820da1ef628fb84933ea675d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25b67af73f586837594ab0db4b89baed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2019-10-22更新
|
456次组卷
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2卷引用:2020届湖北省武汉市外国语学校高三下学期模拟文科数学试题
名校
5 . 已知等比数列
的公比
,前
项和为
,且
.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.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/9713d811960e886cc18d2d3e554ebc4a.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e46bdfb56998476b70fa3f4dd9854a1.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)
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2019-09-23更新
|
762次组卷
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6卷引用:湖北省武汉市武昌实验中学2019-2020学年高一下学期3月月考数学试题
解题方法
6 . 已知数列
中,
,
.
(1)证明数列
为等比数列,并求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](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/dd2f75d8d5d4e1922c75e8b7e5966078.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48b90b19d542879604b60bf903bea0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee418b4a8e15307f2549a57abfa043dd.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)
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7 . 已知{an}为正项等比数列,a1+a2=6,a3=8.
(1)求数列{an}的通项公式an;
(2)若bn=
,且{bn}前n项和为Tn,求Tn.
(1)求数列{an}的通项公式an;
(2)若bn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930b640cf850b42c6d6040bf43bbc1b9.png)
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8 . 某地区2018年人口总数为45万.实施“放开二胎”新政策后,专家估计人口总数将发生如下变化:从2019年开始到2028年每年人口比上年增加0.5万人,从2029年开始到2038年每年人口为上一年的99%.
(Ⅰ)求实施新政策后第n年的人口总数
的表达式(注:2019年为第一年);
(Ⅱ)若新政策实施后的2019年到2038年人口平均值超过49万,则需调整政策,否则继续实施,问到2038年后是否需要调整政策?(参考数据:
)
(Ⅰ)求实施新政策后第n年的人口总数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(Ⅱ)若新政策实施后的2019年到2038年人口平均值超过49万,则需调整政策,否则继续实施,问到2038年后是否需要调整政策?(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0d92e62197c7965161a7d0b47af9f8.png)
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2019-05-18更新
|
429次组卷
|
3卷引用:湖北省武汉市武昌实验中学2019-2020学年高一下学期3月月考数学试题
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9 . 已知数列
满足:
,数列
满足:
,其中
为数列
的前
项和,且
.
(1)求数列
与
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6d2fb35fa0215e4dc505d88d4b0882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb1e1bbb8b41e2e4d140eafdab14885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/ebaf2a2590bb84d646957f913d78f6dc.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361e6dc5b44791f33ea0d41b958f30a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52c9237cb0b4acc568d4afb12997186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2017-08-15更新
|
942次组卷
|
2卷引用:湖北省武汉市第四十九中学2024届高三上学期九月调考模拟数学试题(二)
10 . 设公比为
的等比数列
的前
项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c22c96b4d06bc3172cbeb08f4e8c4d2.png)
![](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/b150764a56bf4ec830ae0d21f713f2e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c03d6307f08eafb519ac87bdd13283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2017-02-24更新
|
1236次组卷
|
9卷引用:2017届湖北省武汉市武昌区高三1月调研考试文数试卷
2017届湖北省武汉市武昌区高三1月调研考试文数试卷湖北省浠水县实验高级中学2017届高三数学(文)测试题(2017年1月16日)(已下线)2018年5月31日 等差数列与等比数列——《每日一题》2017-2018学年高二文科数学(已下线)2019年5月16日 《每日一题》(文科)—— 等差数列与等比数列西藏昌都市第一高级中学2021届高三上学期期末考试数学(理)试题(已下线)解密03 等差数列与等比数列(讲义)-【高频考点解密】2021年新高考数学二轮复习讲义+分层训练(已下线)第28讲 等比数列及其前n项和(练)- 2022年高考数学一轮复习讲练测(课标全国版)安徽省阜阳汇文中学2022-2023学年高二下学期第三次月考数学试题(已下线)BBWYhjsx1113