解题方法
1 . 已知等差数列
满足
,设
是数列
的前
项和,记
.
(1)求
;
(2)比较
与
的大小;
(3)如果函数
对一切大于1的正整数
,其函数值都小于零,那么
应满足什么条件?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d11141ecb82398a9adc5dfdb0b9d94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c38fb4d9ed4f1debb61d97e693fb5f5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b08d8e48f1a494bd7fa205362035952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35d879b534a1dc0102d8fdf0005a4f2.png)
(3)如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859e3e04d48088f02fd81881604c5975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
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2024-04-07更新
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218次组卷
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2卷引用:第五届高一试题(初赛)-“枫叶新希望杯”全国数学大赛真题解析(高中版)