已知各项均为正数的等差数列
的前三项和为12,等比数列
的前三项和为
,且
,
.
(1)求
和
的通项公式;
(2)设
,其中
,求数列
的前20项和.
![](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/82fb5ba0c997563002ee3c9d00e97f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fe0f4e8a80a2840c0f6929a8a6351b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769fe52ac96348d3b12d23d06d702595.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42aa7963c57031e17427a72f5a12641b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
2022·重庆·二模 查看更多[3]
重庆市2022届高三第二次联合诊断检测数学试题(已下线)2022年高考考前20天终极冲刺攻略(三)【数学】(新高考地区专用) (5月30日)江西省宜春市丰城市东煌学校2023-2024学年高二下学期3月月考数学试题
更新时间:2022-04-12 17:14:54
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【推荐2】等比数列
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【推荐1】设数列
是各项均为正数的等比数列,
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