已知函数
(
是自然对数的底数).若
,则实数
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a566334dffa59cf84fad988cf242c6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
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2018高三下·江苏·专题练习 查看更多[2]
更新时间:2018-05-16 18:00:13
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解题方法
【推荐1】若不等式
对任意
成立,则实数
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b994efd31f69c1193162f257c2fc28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66692ec49a458f9e48c7315d03dfc37b.png)
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【推荐2】在
中,已知
,边
满足
,则
的最大值是______ . (此空结果保留两位小数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知偶函数
是定义在
上的可导函数,当
时,有
,则
的解集为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7fc858ab3d3ecd62747b97eafdf94f.png)
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【推荐2】已知函数
的定义域为[-1,5],部分对应值如下表,
的导函数
的图象如图所示,下列关于
的命题:
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/07a0711fd3364ccabd4dc971e524082c.png?resizew=167)
①函数
的极大值点为0,4;
②函数
在[0,2]上是减函数;
③如果当
时,
的最大值是2,那么
的最大值为4;
④当
时,函数
有4个零点.
其中正确命题的序号是__________ .
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/d454bc1abd40426e86998926bad4d36f.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/5ea22c337c294dffb2c7acb08fb1c12c.png?resizew=61)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
-1 | 0 | 4 | 5 | |
1 | 2 | 2 | 1 |
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/07a0711fd3364ccabd4dc971e524082c.png?resizew=167)
①函数
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
②函数
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
③如果当
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/63a13fd698694c7986959260129e81e4.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/4eb143cf86df4c829b2e7050a9524f86.png?resizew=9)
④当
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/00b1a3c5c8d848e4912ffdb4d81a575d.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/ebc48be908704f23ae6c0688acb6373a.png?resizew=84)
其中正确命题的序号是
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【推荐1】已知
是定义在
上的偶函数,当
,且
时,
恒成立,
,则满足
的
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
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【推荐2】函数
定义域为R,导函数为
,
满足下列条件:①任意
,
恒成立,②
时,
恒成立,则关于t的不等式:
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a53de2e60c85b2044ed87efc5b76b8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3add1679c27392a1a7f635723a4b36eb.png)
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