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1 . 在等差数列
前
项和为
,若
,则
的值为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894aaec56149f880c7cf2bbc0f358d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3903653955c424d3f6135edc5b47e231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e7ab7bf1cdb51138715800edd9178be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b381488d08566330ff0355ebd41b53.png)
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名校
2 . 计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973fd8ae96e73fd27935c190a243358a.png)
________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973fd8ae96e73fd27935c190a243358a.png)
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2017-10-14更新
|
253次组卷
|
2卷引用:山东省济南外国语学校2017-2018学年高二10月月考数学试题
3 . 等差数列{an}中,已知a3+a8=12,那么S10的值是_____ .
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12-13高三·广东广州·阶段练习
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4 . 如果等差数列
的前n项和为
,若
,那么
等于_______ .
![](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/4250e3ff87622580f7e8923e3284891d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194592cb77de8a597d5d64e1c85c3249.png)
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2016-12-04更新
|
460次组卷
|
3卷引用:2015-2016学年山东济南一中高二上学期期末文科数学试卷
5 . 等差数列
中,已知
,那么
的值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bc693d75f7918a49cae6d075da2aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
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6 . 已知
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582d16fdced371746600c4d0e885a601.png)
,则
的前
项和为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582d16fdced371746600c4d0e885a601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea49e8c6e5355358931080991de2b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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10-11高二·山东济宁·阶段练习
名校
7 . 若数列
的前
项和
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.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/a03b9ec5725898e5ea5adabbf9e7c030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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