已知等比数列
的公比为q,前n项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9ff6268267a2099bdeaf77b86625a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e915e2aaa159f072a814b7a6965c8f6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
23-24高二上·河北保定·阶段练习 查看更多[2]
河北省保定市第一中学2023一2024学年高二上学期第四次阶段考试数学试题(已下线)第4.3.2讲 等比数列的前n项和公式(第1课时)-2023-2024学年新高二数学同步精讲精练宝典(人教A版2019选修第二、三册)
更新时间:2023-12-26 23:41:02
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解题方法
【推荐1】在数列
中,
,
,若
(其中
),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9f42949920904b8be46312deb5a8584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1511f84306f7565592b0c9afbbca917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a280c121374779b7cfbd9cd483b8e08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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【推荐2】已知数列
为等比数列,其前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
_______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.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/ed6ee01b16d98fe02a5f4727be453b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
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【推荐1】记等比数列
的前n项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953c689174badf195a98fe1fc3fbbfb8.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601c29c347a3deac22100c57b50a8be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953c689174badf195a98fe1fc3fbbfb8.png)
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