等差数列
中
,
. 若集合
中仅有2个元素,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1cfff6fef1f7f62ce30f599cc22cdf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9969f8f56f6f7fe32c120b98a3c0ac74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033c52d3d1e7608c4c72c5bb26269c84.png)
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21-22高三·四川南充·阶段练习 查看更多[4]
四川省南充高级中学2021-2022学年高三第六次月考数学(理)试题陕西省西安交通大学附属中学2022届高三下学期第七次模拟考试理科数学试题(已下线)1.1 集合(精练)-【一隅三反】2023年高考数学一轮复习(提升版)(新高考地区专用)(已下线)专题1-1 集合与常用逻辑用语-1
更新时间:2022-03-17 17:05:54
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【推荐1】设
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【推荐2】等差数列
,
,且
是
与
的等比中项,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5d881b0a9f333f1fefad6167ecdd0b.png)
______ .
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【推荐1】定义
为数列
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,设
,数列
的前
项和为
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_________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐2】已知数列
的前n项和为
,
,
,
.则数列
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___________ ;若
,
,
成等比数列,
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【推荐1】等差数列
中
,且
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______ ;若集合
中有2个元素,则实数
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【推荐2】若集合
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