题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210115-53225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210116-61282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210116-40213.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210116-96738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-47203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-11835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-82629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-16976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-86542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-24143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-24143.png)
解析
试题分析:(1)由DE∥BC,AD:DB=2:3,根据平行线分线段成比例定理,可求得AE:AC=2:5,又由
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-62883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-11835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-86542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-71962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210119-66381.png)
(2)取点AB的中点M,作
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-16976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-86542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-24143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-24143.png)
试题解析:(1)∵DE∥BC,
∴AE:AC=AD:AB="2:5" ,
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-62883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-11835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-86542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-71962.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210119-66381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-62883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-86542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-11835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-71962.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210116-96738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-47203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210119-66381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-47203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210119-52070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-47203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-11835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-82629.png)
(2)取点AB的中点M,作
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210117-16976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-86542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-24143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210118-24143.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210108-50512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210109-51550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210102-63221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210102-44644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210059-78418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210055-16329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210050-51289.jpg)
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