已知数列
的前
项和为构成数列
,数列
的前
项和构成数列
.若
,则
(1)求数列
的通项公式;
(2)求数列
的通项公式.
![](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/034ba25825c13725931c483aa47c9363.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/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67f37ceed6af4cead4c82a190f58238.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/57ef6d44448092ebdb9e4a49d866a749.png)
13-14高二上·广东佛山·阶段练习 查看更多[1]
(已下线)2013-2014学年广东省佛山市佛山一中高二10月段考数学试卷
更新时间:2016-12-02 13:10:41
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解答题-问答题
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适中
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解题方法
【推荐1】已知数列
中,
,
.
(1)求数列
的通项公式;
(2)设数列
满足:
,求
的前n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/208cf2b9b66054e4b5e276198136a9ae.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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f052af7ec6eabf99cbea5543397cd1d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐2】我国某西部地区要进行沙漠治理,已知某年(第1年)年底该地区有土地1万平方千米,其中70%是沙漠.从第2年起,该地区进行绿化改造,每年把原有沙漠的16%改造成绿洲,同时原有绿洲的4%被沙漠所侵蚀又变成沙漠.设绿洲面积为a1万平方千米,第n年绿洲面积为an万平方千米.
(1)求第n年绿洲面积an(单位:万平方千米)与上一年绿洲面积an-1(单位:万平方千米)之间的数量关系;
(2)求数列{an}的通项公式;
(3)至少经过几年,绿洲面积可超过60%(参考数据:lg2≈0.301)?
(1)求第n年绿洲面积an(单位:万平方千米)与上一年绿洲面积an-1(单位:万平方千米)之间的数量关系;
(2)求数列{an}的通项公式;
(3)至少经过几年,绿洲面积可超过60%(参考数据:lg2≈0.301)?
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【推荐1】如图,正方形
的边长为1,取正方形
各边的中点E,F,G,H,作第2个正方形
,然后再取正方形
各边的中点I,J,K,L,作第3个正方形
,以此方法一直继续下去.
![](https://img.xkw.com/dksih/QBM/2023/7/5/3274480342679552/3276478035918848/STEM/78e2510a3afe4718a95ef120560e7596.png?resizew=153)
(1)求从正方形
开始,连续10个正方形的面积之和;
(2)假设第n(
)个正方形的面积为
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a8012195f63ecbb610ba810a806103.png)
![](https://img.xkw.com/dksih/QBM/2023/7/5/3274480342679552/3276478035918848/STEM/78e2510a3afe4718a95ef120560e7596.png?resizew=153)
(1)求从正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)假设第n(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7fece9768f5455d2e5e37b628af9d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐2】若等比数列前
项和为
,比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b17a5a5064087b4f2281252473ff3be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a60d73e20fb84f9c0955addb4b3621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8895abc375de2697bab0830aa93f67d3.png)
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【推荐1】已知数列
中,
,
(
),
为数列
的前n项和.
(1)求
的通项公式;
(2)设
,求数列
的前n项和
;
(3)在
,
之间插入n个数,使这
个数组成一个公差为
的等差数列,在数列
中是否存在3项
,
,
,(其中m,k,p成等差数列)成等比数列?若存在,求出这3项;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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03dd47b0469396a7a7aeae1c31eb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83de9a45d9b680da8835bac1fee9c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec4bdc2a6d4fc387dc621f0b5a268c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3468a665ac713ab7b400c672f19650a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8598379ec01edc16c72c1d3fa3ce81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8904e7018ec79c8b0efdcb3ba67cb7cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2554efe1860dc6c769c34d8cfa6de3e4.png)
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【推荐2】已知数列
,
满足
,对任意
均有
,
.
(1)证明:数列
和数列
均为等比数列;
(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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d806abf9558e6be9ce5ba79a79d113ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e557df2f9aeecbc164482608a4c7c88b.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52c9237cb0b4acc568d4afb12997186.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d192ce23fc9dbaa6c44b1e3404dad9aa.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)
您最近一年使用:0次