名校
解题方法
1 . 记
为数列
的前n项和,已知
是公差为
的等差数列.
(1)证明:
是等差数列;
(2)若
可构成三角形的三边,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd5cb06fedc07658ab3ac64eb126d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0dda391f51b090fb65d2a0fe359f5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641382b80972a7c5fd7c7a7226be2c59.png)
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2022-08-02更新
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1114次组卷
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4卷引用:福建省福州第一中学2023届高三上学期开学质检考试数学试题