题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022111-42743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022111-75012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022111-42257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022111-20782.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-43105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-15919.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-42284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-34064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-30323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-13399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-29830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-74656.png)
答案
解析
试题分析:(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-61977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-56097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-16553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-58460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-43105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-15919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-13399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-29830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-38555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-29830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-27715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-71414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-13399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-29830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-74656.png)
试题解析:(1)证明:
连结
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-61977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-56097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-16553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-16553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-61977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022114-58460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-17716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022116-81152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022111-75012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022111-42257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022116-93773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-17716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022116-58237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-15919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022116-84788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-15919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022116-58510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-43105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-15919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022117-66855.png)
(2)若在线段
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-34064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-30323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-13399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-29830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-38555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-29830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-27715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022117-19611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022117-75591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022118-67475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022117-75591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022118-85125.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022118-26866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022118-10218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-71414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022118-60137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-71414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022119-59123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022115-71414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022119-21001.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022119-93243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022119-65042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022120-53286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022120-27307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022120-85366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022120-56686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022121-47138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022121-60022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022121-18663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022112-34064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022113-30323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022121-93236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022122-66575.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022056-18284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022056-70884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022056-84236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022056-74798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022056-48524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022057-11548.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022057-94791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022057-67148.png)
(2)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022058-84949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022058-12304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022048-44806.png)
(1)PA∥平面MDB;
(2)PD⊥BC.
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022040-17516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022040-99637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022041-12316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022040-99637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022041-84327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022034-99197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-66595.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-29549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-85641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-44714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-29549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-86586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-45547.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-94896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022036-36299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022036-15981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022035-29549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022036-47547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022036-88751.png)
其中真命题是_ __.(写出所有真命题的序号).
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022023-52915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022024-37952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022024-46265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022024-30979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022025-75315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022025-96099.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022025-44320.png)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106022025-23528.png)
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