若等比数列
满足
,则
的前n项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac6538d84e4aab8f53fd9c60a84d301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
更新时间:2022-02-15 09:26:18
|
相似题推荐
【推荐1】等比数列
的前
项和为
,若
,
,
成等差数列,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a37f1b45e929b42044626edb63681fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b2667a6c91b720ca9b42d092c776cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
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【推荐2】设等比数列
的各项均为正数,
,则
的通项公式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6eddcda589eb4fd693f7eaa956b06ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
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解题方法
【推荐1】设数列
满足
且
记
的前
项和为
则![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/dab9165811b24b7e87f20b9668013e98.png?resizew=39)
_____
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/66f23785c15f43efa577fb7f4a34aaf4.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/f546210ed3904772b49bc23173125607.png?resizew=204)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/43ca912aba8c4c16aed24d74bd00c329.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/66f23785c15f43efa577fb7f4a34aaf4.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/a340115a41ff4ef7827e03af7e1de0ee.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/e532c01bf6c847fe95fda3522e4c0105.png?resizew=25)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570814378164224/1570814383554560/STEM/dab9165811b24b7e87f20b9668013e98.png?resizew=39)
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解题方法
【推荐2】记
为等比数列
的前
项和,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
__________ .
![](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/0ce47f92ca803ca110ff7a87000e6eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2955370028ae5a872079c12bfedc3b4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
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