1 . 在等差数列
中,
,
.令
,数列
的前
项和为
.
(1)求数列
的通项公式;
(2)求数列
的前
项和
;
(3)是否存在正整数
,
(
),使得
,
,
成等比数列?若存在,求出所有的
,
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/d5ef35b21da4cd8130642539d8245f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f2572192cc7ca046e9a3155ef3e56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.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)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](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)
(3)是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667160d99fbb37feca6001a20e4e1cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9a724b59c890095baa5cb73e267c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e74be91bfe4bc209da7539dbf9b72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
名校
解题方法
2 . 数列
的前
项和为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9aa8c8737223748f099a5c437f3a2cb.png)
(1)写出
的值,并求
的通项公式;
(2)正项等差数列
的前
项和为
,且
,并满足
,成等比数列.
(i)求数列
的通项公式
(ii)设
,试确定
与
的大小关系,并给出证明.
![](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/b9aa8c8737223748f099a5c437f3a2cb.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed529240a883f68f0921e818addeb9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)正项等差数列
![](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/08b6f02731cfe96d404a446d0b8bccc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975a03319e38805eb6e5baa4febe03a4.png)
(i)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(ii)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf5c50376dddd9144cc896a76b1aab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
您最近一年使用:0次
2020-02-07更新
|
487次组卷
|
2卷引用:上海市晋元高级中学2015-2016学年高二上学期期中数学试题
3 . 在平面直角坐标系中,O为原点,两个点列
和
满足:①
;②
(1)求点
和
的坐标;
(2)求向量
的坐标;
(3)对于正整数k,用
表示无穷数列
中从第k+1项开始的各项之和,用
表示无穷数列
中从第k项开始的各项之和,即
,
若存在正整数k和p,使得
,求k,p的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce1d3623bdacf537112e68d19280cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea50e8e732eb54a58187f0120ddfa4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa87955086029ea9f21a183b7b02cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de3734915f00f928b47f95b60a9d930.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2857fac4963b129d99e79dcb3e13d295.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b65a3cabd534738ebb98823e5c203c5.png)
(3)对于正整数k,用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3366d7ca7f07ee5934dd14905b709ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233427826eb2233641fc3a9805f6d206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2554d695634e739d2f05478af4eec3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a820980421924168e7df730db69a7873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebd7784f05776e493fe9a261988a8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bbef797ccfec69924a425e8e7682a9.png)
您最近一年使用:0次
2014·上海徐汇·一模
名校
解题方法
4 . 一个三角形数表按如下方式构成(如图:其中项数
):第一行是以4为首项,4为公差的等差数列,从第二行起,每一个数是其肩上两个数的和,例如:
;
为数表中第
行的第
个数.
…
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f95aaf633b692769df70ead32d09b.png)
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f3141c9a3543d080052159918cb7d7.png)
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f3b1c2ecda47422b4807489d3efabf.png)
……
(1)求第2行和第3行的通项公式
和
;
(2)证明:数表中除最后2行外每一行的数都依次成等差数列,并求
关于
的表达式;
(3)若
,
,试求一个等比数列
,使得
,且对于任意的
,均存在实数
,当
时,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5d0a73f50b3e4583f1c1b6d6bf0d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ff64e5f0e9058bf4358024dfeeaa23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ac67868774922bd551bd3a921919e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b433ad3f880bd4b12f8ec04b733235e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c96813e6e4d6c93cf171bc354eb0618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74af3720f59ce4f2d00a8e798d297c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f95aaf633b692769df70ead32d09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b52d0d1757ca7af6b4e75dcc8edc3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ccaeb381a7f4062c8a70541ed95b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f3141c9a3543d080052159918cb7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8d153808e059cced1f34cd37b82f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f3b1c2ecda47422b4807489d3efabf.png)
……
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66264366bbcab975022cffa711236f18.png)
(1)求第2行和第3行的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2295a385504d809c311ff4bb3f980bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619cef116e3f701de6707ec0b4dc728a.png)
(2)证明:数表中除最后2行外每一行的数都依次成等差数列,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf50e032946010d31c6288135eb4303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b640c28d4f3afbf94d07ec2e4d98b06.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b319dbcf9f7afc9a20ab83e312a5e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a92d4463e0a56109a13d60b640e0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52fc0fe9024f5a2abc30f67eeff626b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15bb6414a399db20565393afa52091a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46708de4fb77ee69d2a5453de0cefa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe9dbc75f393b682c8a90fe7277ab4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afaaa196735c0c02f05f97fda5534a4.png)
您最近一年使用:0次
2019-04-14更新
|
523次组卷
|
5卷引用:上海市七宝中学2020-2021学年高二上学期10月月考数学试题
上海市七宝中学2020-2021学年高二上学期10月月考数学试题(已下线)2014届上海市徐汇、金山、松江区高三下学期学习能力诊断理数学试卷上海市南洋模范中学2019届高三下学期3月月考数学试题2016届上海市南洋模范中学高三5月三模数学试题四川省成都市教育科学研究院附属中学2023-2024学年高二下学期3月月考数学试题
2012·上海·二模
名校
5 . 已知数列
是各项均不为
的等差数列,公差为
,
为其前
项和,且满足
,
.数列
满足
,
为数列
的前n项和.
(1)求数列
的通项公式
和数列
的前n项和
;
(2)若对任意的
,不等式
恒成立,求实数
的取值范围;
(3)是否存在正整数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fde8c4aced29ce6b664d54ac95f87a.png)
,使得
成等比数列?若存在,求出所有
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://img.xkw.com/dksih/QBM/2012/3/29/1570822592405504/1570822597566464/STEM/6cebca9901734f59b0069156cf24bca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c39dd748533f2afe8b5491460c3d42a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d726666f99a5a41dd673a2330e377b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63ddab551f525a8af0fcad0b4cf6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(2)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d726666f99a5a41dd673a2330e377b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b99375c025c8a57abd7595a0184e429.png)
![](https://img.xkw.com/dksih/QBM/2012/3/29/1570822592405504/1570822597566464/STEM/2e834399303b4f90932833e0dc4bf128.png)
(3)是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fde8c4aced29ce6b664d54ac95f87a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa9480fca9e4b0389d69c90e9929a1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc67e5d8d9e499c9eef0ab16278bc9ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fde8c4aced29ce6b664d54ac95f87a.png)
您最近一年使用:0次
2016-12-02更新
|
819次组卷
|
4卷引用:上海师范大学附属宝山罗店中学2023-2024学年高二上学期期中数学试题
上海师范大学附属宝山罗店中学2023-2024学年高二上学期期中数学试题(已下线)2012届上海市崇明县高三高考模拟考试二模理科数学试卷江苏省扬州市仪征中学2020-2021学年高二上学期期中模拟(2)数学试题(已下线)2013届广东省陆丰市碣石中学高三第四次月考文科数学试卷