1 . 已知
,则
的前25项的和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e011913056c2c14e5935097a3e4696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
您最近一年使用:0次
解题方法
2 . 已知等比数列
的前
项和为
.
(1)求数列
的通项公式;
(2)设数列
满足
,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/e902b4ba517e3243f1f96002d19fbdbf.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0a2d2e68592f445c4ea2d6a57e7950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da72309d2507e2f5e5ed88d8cc08963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解题方法
3 . 在直角坐标平面上有一点列
,
,…,
,…,对一切正整数n,
的横坐标构成以
为首项,
为公差的等差数列
,且数列
的前n项和为
,满足
.
(1)求点
的坐标;
(2)设抛物线列
,
,
,…,
,…中的每一条的对称轴都垂直于x轴.第n条抛物线
的顶点为
,且过点
,记与抛物线
相切于点D的直线的斜率为
.求:
①抛物线
的方程;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c051c2459ca7e2edd8ece9e565ec4b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba26ffd74951c209cd7afe8e13d864fb.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
(2)设抛物线列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae8eed0b891fa0bdd01461ec1352852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbbf4d763f3cbe5a71707bc19c78191.png)
①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c1e725a9c7a9d0be4ee4961e576070.png)
您最近一年使用:0次
4 . 已知
是数列
的前n项和,
,______.
①
,
;②数列
为等差数列,且
的前3项和为6.从以上两个条件中任选一个补充在横线处,并求解:
(1)求
;
(2)设
,求数列
的前6项和
.
注:如果选择多个条件分别解答,按第一个解答计分.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12d0bd9afdd4e53ff37f5bfcaa1106c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bbb03e9f93969580c6f07667c209779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936c7ec580bc96451d12dee03da99d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b647ac8a8174071a4f332a00b5507b.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
解题方法
5 . 已知等差数列
满足
,若数列
的前
项和为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ead5ea28b581771fe7b6acc20514432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.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/7978d7bd6f6caf9ac9837ffce5f89654.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-01-18更新
|
352次组卷
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2卷引用:云南省保山市腾冲市第八中学2023-2024学年高二下学期开学考试数学试题
6 . 已知数列
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8704e1f6a16feca5404d7e252091131.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5cccaf2fdb71015a82f84454aa4bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8704e1f6a16feca5404d7e252091131.png)
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2022-01-21更新
|
856次组卷
|
4卷引用:云南省保山市腾冲市第八中学2023-2024学年高二上学期期末模拟数学试题
7 . 已知数列
满足
(
),且
.
(1)证明:数列
为等比数列,并求出数列
的通项公式;
(2)若数列
满足
,
的前
项和为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cb5372b7e7aa8a7f84529c4e9b863b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209559aca6bf32705588b6a40e0b7320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec20705c3cfae95223db8b08863f661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed744276d728fcd2521d3ea4e355584b.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/94351ce858fa3f3a09cfadc2d23d7253.png)
您最近一年使用:0次
名校
解题方法
8 . 在等差数列
中,
为其前n项和
.若
.
(1)求数列
的通项公式;
(2)设
,求数列
的前n项和
.
![](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/69d307ec71820b6536453fbdb5069da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dab0c023a844269f1ba33131e877db0.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d005409790b3192705a181b2c8e7dfed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2021-09-06更新
|
704次组卷
|
15卷引用:云南省保山市腾冲市第八中学2022-2023学年高二下学期期中考试数学试卷
云南省保山市腾冲市第八中学2022-2023学年高二下学期期中考试数学试卷甘肃省镇原县第二中学2018-2019学年高二上学期期中考试理科数学试题甘肃省武威市第一中学2019-2020学年高三上学期10月阶段性考试数学(文)试题四川省遂宁市射洪县射洪中学2020届高三上学期10月月考数学(文)试题天津市静海区独流中学四校联考2019-2020学年高二10月数学试题陕西省渭滨中学2019-2020学年高二上学期期中数学(文)试题福建省泉州市泉港区第一中学2019-2020学年高二上学期第二次月考数学试题湖北省随州市第一中学2019-2020学年高二上学期期中数学试题河北省张家口市崇礼县第一中学2019-2020学年高一下学期期中数学试题吉林省吉林市吉林第一中学2020-2021学年高二上学期阶段性考试数学试题西藏昌都市第三高级中学2020-2021学年高二上学期期末数学试题上海市市西中学2023届高三上学期期中数学试题天津市朱唐庄中学2023-2024学年高三上学期期中热身数学试题安徽省安庆市第一中学2023-2024学年高二上学期期末考试数学试卷(已下线)模块四 期中重组篇(人教B版高二下云南)
名校
解题方法
9 . 已知数列
的前
项和为
,满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7898dbb6f34e7fdc017d1ce300ccb316.png)
.
(Ⅰ)求数列
的前
项和
;
(Ⅱ)令
,求
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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7898dbb6f34e7fdc017d1ce300ccb316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
(Ⅰ)求数列
![](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)
(Ⅱ)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909de3ed6a01f11309b005873d959b37.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)
您最近一年使用:0次
2020-09-04更新
|
987次组卷
|
3卷引用:云南省保山市2019-2020学年高二教学质量监测考试理科数学试题
真题
名校
10 . 数列
的前
项和为
,若
,则
等于
![](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/5bc1dda068b34ce0a8062dd790f03e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27182444d3da4003680f07ec299087c.png)
A.1 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-11-30更新
|
5407次组卷
|
25卷引用:云南省保山市第九中学2020-2021学年高二上学期第一次月考数学试题
云南省保山市第九中学2020-2021学年高二上学期第一次月考数学试题2007年普通高等学校招生全国统一考试理科数学卷(福建)(已下线)2010年广东省东莞市四校联考高二上学期期中考试数学文卷2014-2015学年重庆市万州二中高一4月月考理科数学试卷广东省东莞市虎门中学2017-2018学年高二上学期第7周限时训练数学(文)试题辽宁省鞍山市第一中学2018届高三上学期第二次模拟考试(期中)数学(文)试题河南师范大学附属中学2017-2018学年高二4月月考数学(理)试题【区级联考】天津市蓟州区2018-2019学年高二上学期期中考试数学试题(已下线)第1章 习题课(2)(课时作业)-2018-2019版数学创新设计课堂讲义同步系列(北师大版必修5)广东省佛山市顺德区容山中学2018-2019学年高一下学期期中数学试题吉林省长春市榆树市2019-2020学年高二上学期期末数学(文)试题北京市第十三中学2019-2020学年高二上学期期中考试数学试题陕西省宝鸡市烽火中学2018-2019学年高二上学期期中数学(文理)试题安徽省滁州市定远县育才学校2019-2020学年高一下学期6月月考数学试题四川省南充高中2019-2020学年高一下学期第一次月考试题数学(理科)试题(已下线)2.5等比数列的前n项和(2) -2020-2021学年高二 数学课时同步练(人教A版必修5)陕西省宝鸡市扶风县法门高中2020-2021学年高二上学期第一次月考数学试题湖北省咸宁市通城二中2020-2021学年高二上学期期中数学试题(已下线)考点43 数列的求和-备战2022年高考数学一轮复习考点帮(新高考地区专用)【学科网名师堂】(已下线)4.3.2 等比数列的前n项和(2)-2020-2021学年高二数学课时同步练(人教A版选择性必修第二册)四川省南充高中2019-2020学年高一下学期第一次月考试题数学(文科)试题(已下线)第43讲 数列的求和2007年普通高等学校招生考试数学(理)试题(福建卷)海南省万宁市民族中学2021-2022学年高二上学期期中考试模拟数学试题(已下线)艺体生一轮复习 第六章 数列 第29讲 数列求和的方法【练】