名校
1 . 设数列
的前
项和为
,且
.
(1)若
,求
;
(2)若数列
为递增数列,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/9952ff4bf01d6a800cd25f0463caa38e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894928c685e56ce04c7b1eb586f2229f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85a0ce925a0ac5ca20a28842fe76444.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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2019-06-12更新
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610次组卷
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2卷引用:【全国百强校】黑龙江省哈尔滨市第三中学校2018-2019学年高一下学期期中考试数学试题