解题方法
1 . 设函数
,
的定义域分别为
,
,且
.若对于任意
,都有
,则称
为
在
上的一个延拓函数.给定函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c332d01efc9ad173021b48bd9080270.png)
(1)若
是
在给定
上的延拓函数,且
为奇函数,求
的解析式;
(2)设
为
在
上的任意一个延拓函数,且
是
上的单调函数
①判断函数
在
上的单调性,并用单调性的定义给出证明;
②设
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e03ad0c315806342d6cd732a0b91a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5886cf72ed5a1073263eb9ff485c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48101d1755703877e99969012ddb4448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48007f4bc82fa1ab912fe97cc4f38baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b8531591e59e8ced5ff0d3b30764d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790eacf3ea708dc5cfbb85164e57fb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e03ad0c315806342d6cd732a0b91a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48101d1755703877e99969012ddb4448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c332d01efc9ad173021b48bd9080270.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74314814cdc6fb803abb4692458af131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b85da66243efd91e7c606c42f17da5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74314814cdc6fb803abb4692458af131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74314814cdc6fb803abb4692458af131.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e03ad0c315806342d6cd732a0b91a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74314814cdc6fb803abb4692458af131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fce155963060b2e5b9147a185897cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6c6f4483a885a1747c7bf0adb6367d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fce155963060b2e5b9147a185897cc.png)
①判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6c6f4483a885a1747c7bf0adb6367d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2501720149908efa11f777f9327aa754.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1419108104429f6df5d5352a05211e36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bccb7ffc67a018d6548454a3337b276.png)
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