题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-66199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-82670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-78476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-39579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-18667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-89214.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-15292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-12769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-61033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102727-41892.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102728-74431.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102726-39579.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102728-52320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102728-88268.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102728-27308.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102719-87132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102719-73940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-86246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-89757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-76555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-71259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102720-93486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102721-58848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-74688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-49464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-35274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102714-39987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102715-42970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102715-71415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-25954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-50702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-18063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-35190.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-55224.png)
(2)当锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-55224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102658-98601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-67559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-36136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-40273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-21456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-50968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-37254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-60502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-53150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-89789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-91027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-93573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-99955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-27925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-91342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-68491.png)
(1)若线段
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-22089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-91027.png)
(2)若线段
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102652-60044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102652-75177.png)
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