真题
1 . 设数列
的前
项和为
,对任意的正整数
,都有
成立,记
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)记
,设数列
的前
项和为
,求证:对任意正整数
都有
;
(Ⅲ)设数列
的前
项和为
.已知正实数
满足:对任意正整数
恒成立,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b3ec1726461d5ad9c7e19004dff67c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce66022650d7e186f232e3ef48bb1982.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(Ⅱ)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ceac70b34977bb9b2c86f2f79ac38f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dc7b79e3d2114a0a6a8b7d61832ffd.png)
(Ⅲ)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15526f7c892333030073b85fc3baee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fffd330dd6b9241659d790bd2a7fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1073eff13fe1f334242e1df72c3ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fffd330dd6b9241659d790bd2a7fb2.png)
您最近一年使用:0次
真题
名校
2 . 已知数列
的首项
,其前
项的和为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c26b75756a6fd2a865a557df21d9b7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56edc58f076524e70d62c9ff98d64919.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/19099d49dd72256696a7e7f8013eaae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c26b75756a6fd2a865a557df21d9b7e.png)
A.0 | B.![]() | C.1 | D.2 |
您最近一年使用:0次
2016-11-30更新
|
148次组卷
|
2卷引用:2010年普通高等学校招生全国统一考试(四川卷)数学(理科)
真题
名校
3 . 设数列
的前
项和为
,
(Ⅰ)求
(Ⅱ)证明:
是等比数列;(Ⅲ)求
的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f280c1dbd43e8dca6b4c24228cb27f.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8599b021400529aaeb9daa865d603b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938fbb9f65ae66a4bd1831ee71aeeb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
您最近一年使用:0次
2016-11-30更新
|
2611次组卷
|
3卷引用:2008年普通高等学校招生全国统一考试文科数学(四川卷)