选修4-5:不等式选讲
已知函数
,
.
(1)解不等式
;
(2)对任意的实数
,不等式
恒成立,求实数
的最小值.
已知函数
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573135353397248/1573135359991808/STEM/af8122a903704735a9dc9504c0c1167b.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573135353397248/1573135359991808/STEM/ba4af19c688b44aaa50746e9771a9ee5.png)
(1)解不等式
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573135353397248/1573135359991808/STEM/f692f8587e264d47aeb168c435c51980.png)
(2)对任意的实数
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573135353397248/1573135359991808/STEM/5e15af906308432195c5bb9418af81cd.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573135353397248/1573135359991808/STEM/4d42a44912254355a1b59beb0d77b218.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573135353397248/1573135359991808/STEM/84b3b03efb7840059f27a051fdf8c705.png)
更新时间:2016-12-05 00:14:59
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解答题-问答题
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适中
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解题方法
【推荐1】已知函数
.
(1)若
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e838534eb49726d16b80ac20f436c60f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188281cc0c7af6e95c32b9bbb94ffc21.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26cf44f6eb3a0b07394cb8eafaf08a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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适中
(0.65)
名校
【推荐2】已知函数
.
(1) 若不等式
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对一切实数
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2daa41db1b882367821f648b6d75104.png)
(1) 若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a35bb2f4b9a572b80e337808c3bad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427b025b829b1f46ee7b7a19406fa192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2) 在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf08aee8cf961c8ed2e52563b9e5e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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适中
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【推荐3】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752d8db8a05b3ec7312f6ac8b64a07.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86be2de99fbf7f99cd54ab399146b00.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】设函数
.
(1)当
时,解不等式
;
(2)若存在实数
,使得不等式
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e260b8d584ed8aec07d51cf42b38309e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208bb43c5a98cc66bcb58b53f0039340.png)
(2)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398d4d8b9318bb02a76ad32d1175428c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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适中
(0.65)
【推荐2】选修4-5:不等式选讲
已知函数
,
,
(Ⅰ)当
时,解不等式:
;
(Ⅱ)若
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时,
,求
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已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e492f99249ff3e42e725e81ce8355d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6c86deb114585729f72fb2c92f8e2c.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab42740d8f095b5f7825d14c4c312096.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7b5582e1931243dbb90b7591137f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facf8c2f4c22876875f75e856ea0a2a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4955c5adc717b7f6f0b975e0724ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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