名校
解题方法
1 . 已知
,则
的最小值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c730a3973fedee4f0df156d0472e861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d733da5fc73a29b4b1e157fd4a221c79.png)
您最近一年使用:0次
2021-03-28更新
|
3033次组卷
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6卷引用:天津市宝坻区第一中学2020-2021学年高三上学期第四次月考数学试题
名校
2 . 已知正项数列
的前n项和
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117eae42ae149fb6d70091f87be00a08.png)
(1)求数列
的通项公式;
(2)若
(n∈N*),求数列
的前n项和
;
(3)是否存在实数
使得
对
恒成立,若存在,求实数
的取值范围,若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117eae42ae149fb6d70091f87be00a08.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb7ff46fdaab86f900334c55b766ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3576181ad1203cc30b25d4c87b832873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2aa78c96db411c9e1e939ae16de78d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2020-01-01更新
|
2929次组卷
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8卷引用:天津市宝坻区第一中学等六校2020-2021学年高二下学期期中联考数学试题