题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-88778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-28080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-33430.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-13266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-33430.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-13021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-28080.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-88778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-67450.png)
则宽为
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054146-87662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054146-12387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054146-51290.png)
所以当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054146-20053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-33430.png)
(2)设矩形
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-88778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-67450.png)
则宽为
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054146-62344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054147-69684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054147-46878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054147-74160.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054147-72714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054147-59389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-28080.png)
或解:设
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054148-39767.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054148-22901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054148-27373.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054148-31160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054148-85644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054149-64673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054149-21132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054149-47785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054149-53846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054149-20352.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054150-44929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054150-75501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054150-51442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054150-93372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054150-36366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054149-53846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054151-40220.png)
所以当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054147-59389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054151-21452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054145-28080.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054140-81971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054140-30539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054140-79784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054140-94023.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054141-73081.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054141-11763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054141-67360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054141-42780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054137-60338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054137-82552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054138-31126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054138-83464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054138-21444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054133-61625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054134-20996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054134-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054134-17568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054134-34783.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054128-36071.png)
A.(-1,1) | B.(0,![]() | C.(0,1) | D.(1,![]() |
①
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054122-13530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054123-49400.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054123-98954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818054123-66645.png)
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