题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210639-41430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210639-12630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210639-97167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210639-40231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210640-20031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210640-72112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210640-90055.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210641-68496.png)
(2)若正方形的边长为4,求
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210641-85161.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210639-41430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210641-90777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210641-76290.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210642-65041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210642-68963.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210642-85706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210642-12591.png)
(2)解:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210643-58878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210643-70642.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210643-21561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210644-50705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210644-56756.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210644-14765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210641-85161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210644-23379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210645-87116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210645-27090.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210645-30068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210646-29243.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-63857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-12911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-63769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-24904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-35818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-43147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-24904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-23829.png)
A
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-41219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210632-39200.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210633-93749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210633-29007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210622-12268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210622-60375.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210613-32421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210614-94433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210614-42188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210614-28295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210615-64465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210615-64465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210615-80487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210615-64465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210615-97007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210615-38970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210616-32548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210616-24331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210616-16361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210607-54081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210607-55082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210607-41791.png)
A.![]() | B.![]() | C.![]() | D.以上都不对 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210600-58041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210600-13470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210600-26758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210600-76641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210601-26564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210601-20764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210601-52733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210601-34023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102210602-27073.png)
A.1 | B.4 | C.3 | D.2 |
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