题目
题型:不详难度:来源:
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答案
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![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174437-81119.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174436-64797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174437-13314.gif)
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由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174438-68237.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174438-45261.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174436-64797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174437-91893.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022174437-81119.gif)
核心考点
举一反三
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