解题方法
1 . 已知函数
.
(Ⅰ)求
定义域;
(Ⅱ)证明
在
上是减函数.
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957154795520/1572957160734720/STEM/584bbe043f8143ff9d9453b3031c73ed.png)
(Ⅰ)求
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957154795520/1572957160734720/STEM/76a4cd8abf7a410daa76dbf02b8a876f.png)
(Ⅱ)证明
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957154795520/1572957160734720/STEM/76a4cd8abf7a410daa76dbf02b8a876f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a141e697b1a31a9a4e759984e899a5.png)
您最近一年使用:0次
12-13高一上·北京·期末
解题方法
2 . 函数
的定义域关于原点对称,但不包括数
,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)
是一个正的常数);
(3)当
时,
.
证明:(I)
是奇函数;
(II)
是周期函数,并求出其周期;
(III)
在
内为减函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.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/e0aff4b41805fecb8ddc7f6990d9a10c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27822887caad20f3a075ca2fb74155c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095be928748d6aee0cae4e9f69981f9e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a606c7099a87a8403c9c8c905d1bff4.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441145ab6423aa3155c2d56f42ac8883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
证明:(I)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(II)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(III)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682f449e32b92543daf6c08bfefdcb9c.png)
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12-13高一上·北京·期末
3 . 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
4 . 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)
您最近一年使用:0次
5 . 已知函数
.
(Ⅰ)求f(1)的值;
(Ⅱ)判断函数f(x)的奇偶性,并加以证明;
(Ⅲ)若f(2x)>0,求实数x的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572544560381952/1572544566321152/STEM/9024b9b589914e7ea684778af18902e0.png)
(Ⅰ)求f(1)的值;
(Ⅱ)判断函数f(x)的奇偶性,并加以证明;
(Ⅲ)若f(2x)>0,求实数x的取值范围.
您最近一年使用:0次
解题方法
6 . 已知函数
.
(Ⅰ)求f(x)定义域;
(Ⅱ)证明f(x)在(0,+∞)上是减函数.
![](https://img.xkw.com/dksih/QBM/2016/3/16/1572540736413696/1572540742500352/STEM/9608b85c25cd4a2398984b74105dbd2d.png)
(Ⅰ)求f(x)定义域;
(Ⅱ)证明f(x)在(0,+∞)上是减函数.
您最近一年使用:0次
解题方法
7 . 对于任意的n∈N*,记集合En={1,2,3,…,n},Pn=
.若集合A满足下列条件:①A⊆Pn;②∀x1,x2∈A,且x1≠x2,不存在k∈N*,使x1+x2=k2,则称A具有性质Ω.如当n=2时,E2={1,2},P2=
.∀x1,x2∈P2,且x1≠x2,不存在k∈N*,使x1+x2=k2,所以P2具有性质Ω.
(1)写出集合P3,P5中的元素个数,并判断P3是否具有性质Ω.
(2)证明:不存在A,B具有性质Ω,且A∩B=∅,使E15=A∪B.
(3)若存在A,B具有性质Ω,且A∩B=∅,使Pn=A∪B,求n的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9df41d67a96fb8ffc19bbbcf5597dfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2623bcade9e7521db92dfcb45b90f91.png)
(1)写出集合P3,P5中的元素个数,并判断P3是否具有性质Ω.
(2)证明:不存在A,B具有性质Ω,且A∩B=∅,使E15=A∪B.
(3)若存在A,B具有性质Ω,且A∩B=∅,使Pn=A∪B,求n的最大值.
您最近一年使用:0次
8 . 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)
您最近一年使用:0次
9 . 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.
您最近一年使用:0次
解题方法
10 . 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)
您最近一年使用:0次