1 . 已知数列3,33,333,3333,…则通项![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
2020-02-14更新
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298次组卷
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3卷引用:重庆市江津第六中学2018-2019学年高一下学期期中数学试题
解题方法
2 . 已知等差数列
和
的前n项和分别为
和
,且
,则使得
为整数的正整数n的个数是
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b9044b08e13fffc8b24b76b7196ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462f644c4a74b81d24687e3fc613ec54.png)
A.2 | B.3 | C.4 | D.5 |
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名校
解题方法
3 . 已知正项数列
的前
项和为
,
.
(1)求数列
的通项公式;
(2)令
,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/78515a07797b245e751d0937e2cbb875.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eca10af64cca0122a73a8704f2d33e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2020-02-14更新
|
2901次组卷
|
3卷引用:2019届重庆市高三4月(二诊)调研测试卷(康德版)文科数学试题
2019届重庆市高三4月(二诊)调研测试卷(康德版)文科数学试题2019届重庆市普通高等学校招生全国统一考试4月(二诊)调研测试(康德版)(文科)数学试题(已下线)考点21 求和方法(第1课时)讲解-2021年高考数学复习一轮复习笔记
名校
解题方法
4 . 已知等比数列
满足:
,
是
与
的等差中项,且
不是常数列.记
是数列
的前
项和,若当
时,
取得最小值,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5383c68b875f1647217e7893d36eeed3.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97118aa23232072e4c49f612d6905d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b2667a6c91b720ca9b42d092c776cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ca4f2b82d9d7a8323c8d697338a6a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321189c4c80eac29fd3eaacbca7df051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5383c68b875f1647217e7893d36eeed3.png)
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解题方法
5 . (1)已知点
为圆
上的一个动点,点
为线段
的中点,求点
的轨迹方程
;
(2)若直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc5645a737c2cb1b1f0a6da0b589405.png)
截得由(1)所得曲线
的弦长为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb6e9693f41a982230a768aab99df9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e584f799ea554fc5533925ead4672501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc5645a737c2cb1b1f0a6da0b589405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ac536dc56e720243eca2f623a6b3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e91d2d828694947ab54ca78c7082423.png)
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6 . 已知实数
、
满足不等式组
,若
的最大值为
,则实数
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5721bd590e44c671fbe2ff0fa19cb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4489516aca67a6afe53fac2f1477f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 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)
您最近一年使用:0次
2020-02-08更新
|
802次组卷
|
6卷引用:重庆长寿中学2017-2018学年高二下学期第三次月考数学(文)试题
名校
8 . 已知函数
,直线
与
的图象交点之间的最短距离为
.
(1)求
的解析式及其图象的对称中心;
(2)设
的内角
的对边分别为
,若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20fe096ec66ef4d594b43fb1e010199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0d74254f9bf3d09c4d15f53960de417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6f4ce437c483c3d5d561b8c473a1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8005726c55cef1c075e6004f1285d9db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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9 . 已知
中,内角
、
、
的对边分别为
、
、
,且
.
(Ⅰ)求证:
、
、
成等差数列;
(Ⅱ)求函数
取得最大值时角
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ad7060a5591a0cc7d9e596ea76cb08.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f3b026a73452f5c358e01b51adc3191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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10 . 已知数列{an}的前n项和为Sn,Sn=3an﹣2,数列{bn}满足
.
(1)求an;
(2)求数列{bn}的前n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f883fedacccb06652eabff2dd74463.png)
(1)求an;
(2)求数列{bn}的前n项和.
您最近一年使用:0次
2020-02-07更新
|
144次组卷
|
2卷引用:2019届重庆市巴南区高三上学期期末测试卷理科数学