已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e40e838d7042f180c083d90cf5a828e.png)
(1)用定义证明:函数
在
上单调递减,在
上单调递增;
(2)当函数
有两个大于
的零点时,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e40e838d7042f180c083d90cf5a828e.png)
(1)用定义证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0109d06b8be2e402b5ffbb0aeb501009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6d804ef44bfc64f824b0ccef71765e.png)
(2)当函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d747a218282cd5b10d0b441541c808da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2023-01-07 22:32:24
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解题方法
【推荐1】已知函数
.
(1)是否存在实数
使函数
为奇函数;
(2)判断并用定义法证明
的单调性;
(3)在(1)的前提下,若对
,不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075c29580320b762fea88283603e79a8.png)
(1)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)判断并用定义法证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)在(1)的前提下,若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ba775f2c792e4a9a6b7fbf29891cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知函数
定义在
上且满足下列两个条件:
①对任意
都有
;
②当
时,有
,
(1)求
,并证明函数
在
上是奇函数;
(2)验证函数
是否满足这些条件;
(3)若
,试求函数
的零点.
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010144098582528/2012989301628928/STEM/456458b0f5aa4cb197c5bc71c11cfffa.png?resizew=37)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
①对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbf98e40f2f23810467a5c599ea62c7.png)
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010144098582528/2012989301628928/STEM/06a09e9bc365476f809322aeadd03a5c.png?resizew=147)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01d07f3a82196cabb98a2ab98686eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54b6a060d6c51a328341df76013bd89.png)
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010144098582528/2012989301628928/STEM/456458b0f5aa4cb197c5bc71c11cfffa.png?resizew=37)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
(2)验证函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d44c9fbbc4f7810ba9525fb5d0f577.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9ad855ec3dcb275f2ea1e24fb44919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2136acdd5edab8c8262b3aafe3babe90.png)
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【推荐3】已知函数
(
为常数)是定义在
上的奇函数.
(1)求函数
的解析式;
(2)判断函数
的单调性,并用定义证明;
(3)若函数
满足
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4d7d32cf4b3019c2c4072eecd07b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee6a811d0a83e7c5b650d8f96006d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】已知函数
在区间[2,3]上有最大值4和最小值1,设
.
(1)求
,
的值
(2)若
有三个不同的实数解,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81dc73f0246e8555678221636aab594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba94b35258a2fbde34d7e26be524fb6e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a127fd902fcae6a0d1c00dae3d48ed66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】设 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4024e7cb8ed0b2f27b42008028d3d812.png)
(1)求函数
的单调递减区间;
(2)若方程
有3个不同的实根, 求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4024e7cb8ed0b2f27b42008028d3d812.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d375b85fd63202b9e0e24aa6882791a.png)
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