已知函数
,在函数
图象上任取两点
,若直线
的斜率的绝对值都不小于
,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18148e0a90e2f91ba13add839f70b19b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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19-20高三下·全国·阶段练习 查看更多[2]
更新时间:2020-04-08 07:32:36
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解题方法
【推荐1】已知函数
对定义域内任意
,都有
,则正实数
取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0803f73027eb1eda725c4af835fed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知函数
在
上存在单调递减区间,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e7dc8a2f21ea76818177bf0cb231b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2afd20da41561ef54a5b56c1eaaacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
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较难
(0.4)
【推荐1】已知函数
,在函数
图象上任取两点
,若直线
的斜率的绝对值都不小于5,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e75c41d8b065b290764289da17b467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】丹麦数学家琴生(Jensen)是19世纪对数学分析做出卓越贡献的巨人,特别是在函数的凹凸性与不等式方面留下了很多宝贵的成果.设函数
在
上的导函数为
,
在
上的导函数为
,若在
上
恒成立,则称函数
在
上为“凸函数”.已知
在
上为“凸函数”,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92873c8b9756f629932605381668fc74.png)
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【推荐3】已知函数
,(
,
为实数),若存在实数
,使得
对任意
恒成立,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0269b6e8ca1ac83e8bec771ae99bd15.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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