已知函数
,
.
(1)若
,求自变量
的取值范围;
(2)设
,根据定义证明
在区间
上单调递减.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482d08227480d9f8b35420eff2ce7695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab409bb25958c2f01c73e26042c6f51e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
更新时间:2023-02-01 22:45:10
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解答题-证明题
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【推荐1】已知函数
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(Ⅰ)用定义证明
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(Ⅱ)用定义证明
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894bb40d32426c7c52a5950842ba2d4e.png)
(Ⅲ)作出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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![](https://img.xkw.com/dksih/QBM/2015/1/5/1571946840948736/1571946846339072/STEM/37e3031dbb0b4a2f99ab448bab899955.png)
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名校
解题方法
【推荐2】已知函数
.
(1)判断
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(2)求函数
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(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐1】已知不等式:①
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【推荐2】(1)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67948c49940b5786ad1e4c3548249fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00713ae1220e268e2a8cb7c785745d7.png)
(2)已知命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3876a36c1d9150471047aae09381f50.png)
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