题目
题型:不详难度:来源:
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答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085313-56396.gif)
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又
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085314-73335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085314-66556.gif)
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同理
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085315-13066.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085303-78257.gif)
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求证:
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![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022085227-25074.gif)
(1)
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