名校
解题方法
1 . 已知函数
,数列
各项均为正数,且数列
、
满足:
,
,
.
(1)设
,
,若
是无穷等比数列,求数列
的通项公式;
(2)若对于给定的
满足
,问:是否存在递减数列
,使得
是无穷等比数列?若存在,求出
的取值范围,若不存在,说明理由;
(3)当
时,
为公差不为0的等差数列且其前
的和为0;若对任意满足条件
的数列
,其前
项的和
均不超过
,求正整数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b923078510697d5f7f9ea392eb76dd9a.png)
![](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/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292b7800ba829f3f458cd6c23edf68a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9882a4d12c45d37b650d7e6120c7df7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e31d5f5293de76ffd02c8125caa9eb6.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f75723824158fae6941098197f51b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9adba66018e60187eeb78d67e13db91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若对于给定的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75c671c153751a24549bee59555c7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e021a223c85a5fe67380cf5d489ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2360f4c62f7f1173922e755529a00fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00750edf6ba5e93875f77676e7107a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2360f4c62f7f1173922e755529a00fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de51986abddede978630e0db085330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08a01aed02ce1eaf1aaefaa0342b7ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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