题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014638-32432.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014638-61492.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014638-24730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014639-24371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014639-43709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014639-16488.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014639-93450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014639-16892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014640-81534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014638-24730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014639-24371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014640-51868.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014631-24360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014631-10667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014631-75766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014631-93309.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014632-28990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014632-18969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014632-60074.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014624-76337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014624-78630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014624-33469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014624-94541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014625-55650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014625-18674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014625-19229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014625-98484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014626-76889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014626-77455.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014615-98798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014615-95333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014615-68538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014616-12259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014616-43194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014616-42094.png)
A.60° | B.45° | C.30° | D.90° |
纸片的右下角折起,使得该角的顶点B落在矩形的边AD上,且折痕MN的
端点M, N分别位于边AB, BC上,设∠MNB=θ,sinθ=t,MN长度为l.
(1)试将l表示为t的函数l=f (t);
(2)求l的最小值.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022014604-29801.gif)
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