题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-40310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-72588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-65493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-65493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-37653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032007-31391.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() ![]() |
D.![]() ![]() |
答案
解析
试题分析:作出草图:知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032007-42228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032007-92630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-65493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032009-41077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-72588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-65493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032006-72588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032009-41077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032009-41077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032008-53825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032008-53825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032009-41077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032008-56554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032008-75151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032008-17723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032009-30241.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022032000-44069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031949-44454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031950-24485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031950-25597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031950-26835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031950-43585.png)
在折起后形成的三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031951-70979.png)
①面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031951-14379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031951-76640.png)
③三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031951-70979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031951-42541.png)
其中正确命题的序号是_ .(写出所有正确命题的序号)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-65700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-55763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-43526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-43526.png)
为正方形,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-59441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-61317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-40688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031940-59160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-64625.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-71811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-40427.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-63080.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-90383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-38626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-90383.png)
使
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031941-52230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031942-79879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031942-25311.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031925-62760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031926-18186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031926-32359.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() ![]() | D.若![]() ![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031909-33970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031909-19033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031909-82443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031909-89170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031909-73477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031910-88967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031910-72093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031910-10271.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031910-42841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031910-21357.png)
(2)过
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031911-89681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031911-42775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031911-19914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031911-77092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031912-54622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031912-45114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022031912-97967.png)
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