名校
1 . 用反证法证明:
不可能成等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385020d9b7217f4188001f348dded641.png)
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2 . 给定数列
,若满足
且
,对于任意的n,
,都有
,则称数列
为“指数型数列”.
Ⅰ
已知数列
,
的通项公式分别为
,
,试判断
,
是不是“指数型数列”;
Ⅱ
若数列
满足:
,
,判断数列
是否为“指数型数列”,若是给出证明,若不是说明理由;
Ⅲ
若数列
是“指数型数列”,且
,证明:数列
中任意三项都不能构成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f5d7eb7518d6676fe5a7f56e64d516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc2e93cee2e6a921b66d250bd046b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613e96d4842008797a0f7071d48ce4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac67c97e7df5ccb0672b29266cd39eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1897b6556a77133581546a0b52f0095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdccd587b3a184c5315d090918137f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fa45d99faf476e983cd7d31a402135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efe4641b14935ac71265ba4211332f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54aacbbb02e19138e48dd07fca0e0813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b466697b27f8e73efd78431714b064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
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