已知数列
的前
项和为
,且
成等比数列.
(1)求数列
的通项公式;
(2)设数列
的前
项和
,求证:
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1809dbcbecb1aadc1137fcbeade5af76.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36815c5c63a7b8b79974595f4149e292.png)
更新时间:2022-12-25 23:11:55
|
相似题推荐
【推荐1】数列
的前
项积为
,
,数列
是公差为
的等差数列.
(1)求数列
的通项公式;
(2)设
,若数列
的前
项和为
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40f56c314b8b48b5bc9bb557244c011.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/08eb71ecf8d733b6932f4680874dbbf3.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知数列
的首项![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66d7c5dae4d357a278bfd224144ee1f.png)
的前
项和为
.
(1)求证:数列
是等比数列,并求数列
的通项公式;
(2)证明:对任意的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23aacab3c20b215a9616bc3434cc4e28.png)
(3)证明:
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572207888957440/1572207895076864/STEM/d0da94816c534be4a101db4c0e7e0bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66d7c5dae4d357a278bfd224144ee1f.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572207888957440/1572207895076864/STEM/d0da94816c534be4a101db4c0e7e0bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e06816992e1b854b5d4dae9a957b5e1.png)
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(2)证明:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23aacab3c20b215a9616bc3434cc4e28.png)
(3)证明:
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适中
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解题方法
【推荐1】已知两个等差数列
、
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,
,
,记
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.
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(2)记
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01db9e72ab3412d67cdba3afe6af2f8.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea8788ec9dad417d69139c7db875234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】已知数列{
}的前n项和
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(1)求数列{
}的通项公式:
(2)设
,求数列{
}的前n项和
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(3)若对于任意正整数n,都有
,求实数λ的最小值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0f2118f2771a5a347f7dab243417ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
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(2)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f2cd61882aab1728cd9fd4f391df61.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5f96a790435d83314a621906ce2382.png)
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(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf511b71de942738ca1f4b211b95cd6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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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您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】数列
的前
项和为
,
,对任意
,有
.
(1)求数列
的通项公式;
(2)若
,求数列
的前
项和
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03dd47b0469396a7a7aeae1c31eb5c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c30f4579de6ba7e8a48a1369ab6e85a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次