解题方法
1 .
为数列
的前
项和,已知
,且
.
(1)求数列
的通项公式
;
(2)数列
依次为:
,2、
,
,
,
,
,
,
,
,
,
,
,
,规律是在
和
中间插入
项,所有插入的项构成以2为首项,2为公比的等比数列,求数列
的前50项的和.
![](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/81efcbacaa4c9d3e107fe892cea785da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad4668cc927e277289b2af718f0d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6648bc986a558fa32e752d28d3a68431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa6ec171ea9f8e9be9bf13baea05cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955079ed2708734e50394387cf40c111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed76985f3bec401fc8767c1759037392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a1214b29882870f4627c90b2fae99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638ea7f6b269dbc4c39ff46823df3828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000a24d1cf81b08493232a3ddcb8fd39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9262eca3c9c0ea8b283770834ffea27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217b927efe12a98e1082ecd7f035b921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
2022-03-16更新
|
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|
3卷引用:湖南省益阳市2022届高三下学期3月调研考试数学试题
2 . 已知数列
满足
,
,
,数列
是等差数列,且
,
.
(1)求数列
,
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1d918e7fb74176679d526cdfc8fa16.png)
(2)设
,求数列
的前
项和
.
![](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/02ce9d5623b21817dd182b9058dc271a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c968ef8f37cbc55d57380015e0229f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc7afcb1a91de8aeea374985105ab08.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1d918e7fb74176679d526cdfc8fa16.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d44ddab6e0c60119be69985ae7fa65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2022-09-09更新
|
1742次组卷
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7卷引用:湖南省益阳市2022-2023学年高三上学期9月质量检测数学试题
3 . 已知数列
的首项
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb43e949c257d984f60418949f96f4c.png)
.
(1)证明:数列
是等比数列;
(2)数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352d9b76dcf639368fa68cae70149802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb43e949c257d984f60418949f96f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9221d72c9d12b060579e6f79364a6f69.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cce1c53146283e962f6ea72aa6b2ed.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff7c3c1ee3d3b84eef2be446b33a70a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-04-19更新
|
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5卷引用:湖南省益阳市箴言中学2021-2022学年高二下学期2月入学考试数学试题
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