题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222416-29381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222416-27917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222416-52839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222416-23242.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222416-19731.png)
解析
试题分析:先设
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222417-80875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222417-24883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222417-75295.png)
解:设
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222417-12874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222418-98916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222418-40654.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222418-27871.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222419-85406.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222416-19731.png)
点评:本题考查了比例的性质.解题的关键是先假设
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222419-56016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222419-85059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222419-54710.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222404-39465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222404-66424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-48587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-64466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-70580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-94806.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-11136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-89001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222406-91186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222405-64466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222406-58930.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222406-83621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222406-52057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222406-72454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222407-51966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222407-19520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222406-83621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222407-12000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222407-51966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222408-65378.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222358-45503.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222353-23755.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222347-69303.png)
A.4cm2 | B.2cm2 | C.3![]() | D.3cm2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222342-99011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222342-81447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222342-18091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102222343-84114.png)
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