1 . 已知函数
.
(Ⅰ)证明:
是奇函数;
(Ⅱ)用函数单调性的定义证明:
在
上是增函数.
![](https://img.xkw.com/dksih/QBM/2016/5/4/1572614968516608/1572614974742528/STEM/feae75122b484ac1935bf1966dc4e1a2.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2016/5/4/1572614968516608/1572614974742528/STEM/312ae9ab911a4401a9ecffab84a85e75.png)
(Ⅱ)用函数单调性的定义证明:
![](https://img.xkw.com/dksih/QBM/2016/5/4/1572614968516608/1572614974742528/STEM/312ae9ab911a4401a9ecffab84a85e75.png)
![](https://img.xkw.com/dksih/QBM/2016/5/4/1572614968516608/1572614974742528/STEM/d4f700d1a08943dd823c6bfb0259b0aa.png)
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解题方法
2 . 函数f(x)的定义域为D,函数g(x)的定义域为E.规定:函数![](https://img.xkw.com/dksih/QBM/2016/3/23/1572554388209664/1572554394329088/STEM/464d15edf4e8485d920b7cf463fbf0f1.png)
(Ⅰ)若函数
,写出函数h(x)的解析式;
(Ⅱ)判断问题(Ⅰ)中函数h(x)在(1,+∞)上的单调性;
(Ⅲ)若g(x)=f(x+α),其中α是常数,且α∈(0,π),请设计一个定义域为R的函数y=f(x),及一个α的值,使得h(x)=cos4x,并给予证明.
![](https://img.xkw.com/dksih/QBM/2016/3/23/1572554388209664/1572554394329088/STEM/464d15edf4e8485d920b7cf463fbf0f1.png)
(Ⅰ)若函数
![](https://img.xkw.com/dksih/QBM/2016/3/23/1572554388209664/1572554394329088/STEM/c1e0d0677e484394b18ff0a3aac4722a.png)
(Ⅱ)判断问题(Ⅰ)中函数h(x)在(1,+∞)上的单调性;
(Ⅲ)若g(x)=f(x+α),其中α是常数,且α∈(0,π),请设计一个定义域为R的函数y=f(x),及一个α的值,使得h(x)=cos4x,并给予证明.
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3 . 已知函数
.
(Ⅰ)证明:f(x)是奇函数;
(Ⅱ)用函数单调性的定义证明:f(x)在(0,+∞)上是增函数.
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572544585506816/1572544591568896/STEM/f404017697c045f690996339f9c5e450.png)
(Ⅰ)证明:f(x)是奇函数;
(Ⅱ)用函数单调性的定义证明:f(x)在(0,+∞)上是增函数.
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解题方法
4 . 已知函数
.
(Ⅰ)判断并证明函数
的奇偶性;
(Ⅱ)判断并证明函数
的单调性;
(Ⅲ)若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c7b91b091151c2f425952a561f984f.png)
(Ⅰ)判断并证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(Ⅱ)判断并证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26df7212871e4a4859653e632e8289d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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12-13高三上·北京东城·期末
5 . 对于函数
,有如下三个命题:
①
是偶函数;
②
在区间
上是减函数,在区间
上是增函数;
③
在区间
上是增函数;
其中正确命题的序号是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d188aefbf250eb86494d60918164416.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0328dbb8131d8b24b5f767d1e0a2a4.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80bd03a1113a3c036eed26a72e90ec6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa2953facaa48d1616c0da2e988bb680.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6a89796c3c24a3d348d97fe1878db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa2953facaa48d1616c0da2e988bb680.png)
其中正确命题的序号是
A.①② | B.①③ | C.②③ | D.①②③ |
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12-13高一上·北京·期末
6 . 函数
的定义域关于原点对称,但不包括数0,对定义域中的任意实数
,在定义域中存在
使
,
,且满足以下3个条件:
(1)
是
定义域中的数,
,则
;
(2)
,(
是一个正常数);
(3)当
时,
.
证明:(1)
是奇函数;
(2)
是周期函数,并求出其周期;
(3)
在
内为减函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd028447f29935835db4e3aafc54dcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de175251f4542ac12e81405fc5ad074e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de175251f4542ac12e81405fc5ad074e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b8532e1352833824ce93be53d896d6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb04d514baf56eec084671b88898770b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441145ab6423aa3155c2d56f42ac8883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
证明:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb3fd46975763046c214db1ed22610b.png)
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10-11高二下·北京·期末
7 . 已知
是定义在
上的奇函数,且
,若
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d476f14a11d6a5aae028fe1d4b52c7.png)
(1)用定义证明:
在
上是增函数;
(2)解不等式
;
(3)若
对所有
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249a976e88133f3b3733f09137cf5c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f989f394645ef2f0c856e0adcd333593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d476f14a11d6a5aae028fe1d4b52c7.png)
(1)用定义证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
(2)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63adedc645ec99e52a2afb25b6ff21e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0519eee9b07f424d5682622512611fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca579006427f1022e7ca3c49b44c41d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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