设
为数列
的前
项和,且
.
(1)证明:数列
为等比数列;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de59c712b13002bba109d7230c33e54.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95bf0c40e4c9e44a891b10ba884d66e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c614e62c5c4bbfbbe1234f8a7a0dcc1e.png)
20-21高二下·江西景德镇·期末 查看更多[2]
更新时间:2021-07-15 00:00:43
|
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(1)证明:数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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(2)设
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解答题-证明题
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解题方法
【推荐2】记数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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(1)求
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(2)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-问答题
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适中
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【推荐1】已知数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】已知数列
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