1 . 数列
满足:①
;②
最小.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672c681fca1ef390ca47a9f94aade005.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3d4ca554fc3672ed8b02f43b3e6e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92daff51fd165c8107631e4648978bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672c681fca1ef390ca47a9f94aade005.png)
您最近一年使用:0次
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解题方法
2 . 已知函数
,
.
(1)若不等式
对
恒成立,求实数a的范围;
(2)若正项数列
满足
,
,数列
的前n项和为Sn,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681d6d27b23b1c41834d7516122f73f9.png)
(1)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a527fde68b2bbeec4fe524dafff4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b60302d80d8613675bb3dd5c03164.png)
(2)若正项数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e940969885f8098b4b166a0d368cf88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13044f8fdbf680c2cc612ad74b0a62ba.png)
您最近一年使用:0次
2021-05-12更新
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624次组卷
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3卷引用:陕西省西安市西北工业大学附属中学2021届高三下学期第十二次适应性考试理科数学试题
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