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1 . (1)已知
,求证:
.
(2)已知
,求证:
在定义域内是单调递减函数;
(3)在(2)的条件下,求集合
的子集个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d41acc47493556617fe7b9e55093d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8babf018f42b32990f65768ed81ef5.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ea5e39c4f2025dbd80d8629c6b71e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)在(2)的条件下,求集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fd56c0a0ba232750157d2241284959.png)
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2020-01-16更新
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235次组卷
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5卷引用:上海市七宝中学2017-2018学年高二上学期开学考试数学试题