在等差数列
中,
,
.
(1)求
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888cc0e4792d7fdbd704837a26fd0b7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feff63be81acfd0efa846fe6098118e2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91adba8efbf964e9e35547b0fd0ea36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
更新时间:2021-12-27 16:23:56
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【推荐2】已知等差数列{an}满足a3=5,a5﹣2a2=3,又等比数列{bn}中,b1=3且公比q=3.
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【推荐1】在等差数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐2】已知等比数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43325c782ad95b0ac590b9478ae7041d.png)
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