已知等差数列
中,
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3197b5438982369b554442a8400a0d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a20010b5a5b3a682d5c1f5efc81d64.png)
23-24高二上·江苏扬州·期中 查看更多[3]
江苏省扬州市宝应县2023-2024学年高二上学期期中数学试题新疆维吾尔自治区喀什地区疏勒县实验学校2023-2024学年高二上学期12月月考数学试题(已下线)第4章 数列 (单元重点综合测试)-2023-2024学年高二数学单元速记·巧练(沪教版2020选择性必修第一册)
更新时间:2023-11-15 10:40:57
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【知识点】 利用等差数列的性质计算
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【推荐1】已知
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项和为
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填空题-单空题
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容易
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【推荐2】设等差数列
的前n项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a944cf5b9342ac78a5c51bd7f6fb120c.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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