已知数列
满足
,
.
(Ⅰ)若
,求证:对一切的
,
,都有
;
(Ⅱ)若
,记
,求证:数列
的前
项和
;
(Ⅲ)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48041b50a96cff9949353abb4eddb82.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964524945d24cda1829055ce6e1aff06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0515775e751e33b3df49f5ee93c6792.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e613350f5809fcac10e33cb62ee21b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f3f7b749eda7b4d18ee1d679f3c3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5737f1f9cad2471f3ca53241b25a1eb9.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9442001d8e6140794ec56699ca40ac20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71288684872d7afd7e792b9026d4f8ae.png)
更新时间:2019-06-20 07:41:40
|
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef48decc62a3062c1cd0ea4c95c17a28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐1】已知正项数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
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