在等差数列
中,已知
,
.
(1)求数列
的通项公式;
(2)若________,求数列
的前
项和
.在①
,②
这两个条件中任选一个补充在第(2)问中,并对其求解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad30249f4c029f04e602e7a349006b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be41a5a4965ebd346e7ee74d21f0f3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若________,求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/d81b57d696441836b63b25b2547b92d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b7adab471d41ac1b0451f07ab94aa0.png)
20-21高二上·江苏无锡·期中 查看更多[2]
江苏省无锡市江阴二中、要塞中学等四校2020-2021学年高二上学期期中数学试题(已下线)高二上学期期末综合测试一+(A卷基础卷)-2020-2021学年高二数学上学期同步单元AB卷(苏教版,新课改地区专用)
更新时间:2020-11-25 19:15:50
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相似题推荐
【推荐1】在①
,②
为常数
,③
,这三个条件中选择一个,补充在下面横线中,并给出解答.
已知等差数列
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项和为
,
,且________.
(1)求
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(2)求数列
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已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d31d838f1c9455b912e71317b4d9bb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8170fd7e51aa2c8bb82e1be17f4922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
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解答题-问答题
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适中
(0.65)
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解题方法
【推荐2】公差
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(1)求
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(2)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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(2)已知
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解答题-问答题
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【推荐1】已知数列
的前
项和为
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,
.
(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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(1)求
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(2)记
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解答题-证明题
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(0.65)
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解题方法
【推荐2】已知数列
的前
项和为
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的通项公式;
(2)设
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前
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67fd0eb54561cd1df683a08cf049bfc.png)
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【推荐1】已知公差为正数的等差数列
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【推荐2】已知等差数列{an}的前n项和为Sn,且S5=
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