1 . 设
是正项数列
的前
项和,且
.
(Ⅰ)求数列
通项公式;
(Ⅱ)是否存在等比数列
,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c40c3f6e3adc7d78e56d5de5a59117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e24e4ec4a1c05c4d0e835b2576efb6.png)
对一切正整数
都成立?并证明你的结论.
(Ⅲ)设
(
),且数列
的前
项和为
,试比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/9450a72273297d201a197c8572742de6.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(Ⅱ)是否存在等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c40c3f6e3adc7d78e56d5de5a59117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e24e4ec4a1c05c4d0e835b2576efb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64fdcbd0d7d19ac11cc472cf234091a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(Ⅲ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4fb53a51b9d2791409ba32fd4c3669e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ff128b22e3abab2ba8f4d3012c33ee.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
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2017-05-10更新
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2卷引用:第六届高一试题(决赛)-“枫叶新希望杯”全国数学大赛真题解析(高中版)