解题方法
1 . 已知1,
,
,…,
,2为等差数列,记
,
,则( )
![](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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efba990f1fca3fe00fb5e0a7fff0bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25a7135aebae205a7ff2b0336d6087a.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2022-12-26更新
|
998次组卷
|
2卷引用:2022年9月《浙江省新高考研究卷》(全国I卷)数学试题(一)
2 . 已知等差数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)设
,数列
的前
项和为
.问:是否存在
,使得
,
成等比数列,若存在,求出
的值;若不存在,请说明理由.
![](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/3dfa129c3f8f9d41cc175c9c23790ed7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357cf82e1f23d4ce922990a6343407ef.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7905fd422e78a1d22ff6f11950bc5cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644a6315f4d5b7ee88756e224bc1cc90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab86f4889a6965e055d8225920d228b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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20-21高二下·浙江·期末
解题方法
3 . 设等差数列
的公差为d,d为整数,前n项和为
,等比数列
的公比为q,已知
.
(1)求数列
与
的通项公式;
(2)求数列
的前n项和为
;
(3)设
,求证:
.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babd3af8d92d9af9d1560606f71e064b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda289a8fdf0b1bc96bcca6b878764c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f95ce9d509a67c963d8b6d8c33e04b.png)
您最近一年使用:0次
解题方法
4 . 已知数列{
}满足
,
且
=
,n∈
(
是等比数列,
是等差数列),记数列{
}的前n项和为
,{
}的前n项和为
,若公比数q等于公差数d,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cefbb4528036d75c878b002e32037.png)
(1)求数列{
}的通项公式;
(2)记
为数列{
}的前n项和,求
(n≥2,且n∈
)的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b313c69a166d9ba8782f7b4f530c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd578523d92aab4979e0f180a36d9b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaac2b4316cf040ad5df264ee6c172d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429e10d8906347b79a562dd8460c8acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71fd3bd2adc4704035e114536bdb217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71fd3bd2adc4704035e114536bdb217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cefbb4528036d75c878b002e32037.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4079407811e6021aedbf404d1839a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7525cf9ff41846201a925db9a7e682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429e10d8906347b79a562dd8460c8acc.png)
您最近一年使用:0次
名校
5 . 等差数列
满足:
,
.记
,当数列
的前
项和
取最大值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f6bb3a65154ed4be7772de771ce8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8ac942d29135cb8f133cab143af1a0.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.17 | B.18 | C.19 | D.20 |
您最近一年使用:0次
2020-02-01更新
|
1155次组卷
|
6卷引用:2020届浙江省嘉兴市高三上学期期末考试数学试题
2021·浙江·模拟预测
6 . 已知等差数列
与等比数列
满足
,
,
.
(1)求数列
,
的通项公式;
(2)若
,求证:
.
![](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/c528a7cdaf941c327989a194e429c48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e176bf5db8bc1f540796220a08d96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a72334b6680e5c994ca5f825062e19.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e712f42fa33fefef00795afaa26b3a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710044de63cdfc94812bafb3cc54b7c2.png)
您最近一年使用:0次
名校
解题方法
7 . 已知等比数列
的公比
,前
项和为
(
).数列
是等差数列,且满足
,
,
,
.
(1)求数列
和
的通项公式;
(2)记
,证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71acdb04454c77e1e25ad4f336cccfe.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/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9990d2b1f1099520a70eb90bc2446510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ee052e398d538c6aa8c397401cae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1cec6d5a4a7eb8600e1f5afd18bb27c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c66134c9d24d5757235f2dd63b2aacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfc9203137bbf468e73b0f0ebca9176.png)
您最近一年使用:0次
解题方法
8 . 已知等差数列
和等比数列
满足:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624d67d4961c3fdeb1fe637d6230736a.png)
(I)求数列
和
的通项公式;
(II)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff68cbe71788a3b6bd91c868ad1894ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624d67d4961c3fdeb1fe637d6230736a.png)
(I)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(II)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123e0e80c8d89704939a4ebd8f6cf65d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-04-18更新
|
981次组卷
|
4卷引用:2020届浙江省温州市高三下学期4月二模数学试题
2020届浙江省温州市高三下学期4月二模数学试题2020届浙江省温州市普通高中高三下学期4月高考适应性测试数学试题(已下线)第02章等比数列(A卷基础卷)-2020-2021学年高二数学必修五同步单元AB卷(苏教版,新课改地区专用)(已下线)考点19 数列通项与求和与通项-2021年高考数学三年真题与两年模拟考点分类解读(新高考地区专用)
解题方法
9 . 已知单调递增的数列
满足
、
、
成等比数列,
、
、
成等差数列,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5fb13a325e3120aec47dace66925d3.png)
您最近一年使用:0次
2020-11-13更新
|
859次组卷
|
4卷引用:浙江省“数海漫游”2020-2021学年高三上学期8月线上模拟考试数学试题
浙江省“数海漫游”2020-2021学年高三上学期8月线上模拟考试数学试题(已下线)第四章 数列单元测试(巅峰版)课时训练-【新教材优创】突破满分数学之2020课时训练-2021学年高二数学课时训练(人教A版2019选择性必修第二册)(已下线)4.3.2 等比数列的通项公式(1)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)(已下线)专题09 数列的通项公式、数列求和及综合应用(练习)-2
解题方法
10 . 已知等差数列
中,
,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dea786b6895fce4375ac93c89758e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab5a181478e9c2307d9a934d891621d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次