函数
满足
,当
时,
恒成立,又
满足:
,
,设
.
(1)在
内求实数
,使得
;
(2)证明:数列
是等比数列,并求
的表达式以及
的值;
(3)是否存在正整数
,使得对任意
,都有
成立,若存在,求出
的最小值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d25529e1f1ee84da70459bf7ffa9ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073bd519f70576bee70a7ec7b7ac38fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f97718f1472e11502eaa775b58bd05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44123f6e47e69997f029956949884b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bd53dd2cc57cead89f89b46d304a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31028ee632a33f46f1358714fc992d54.png)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c275d203295b989c129101d82e74ae01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14ec136e9ac710ea562bc66a05b79d.png)
(2)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4982eefc80c259419147de7ff8e5074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09c2f627b80a0301d0112f4ebb51316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3307cc210d44315380725216d10ff3d2.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/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aba95f1aacf777532636f8409030f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2021-03-24 19:29:41
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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