题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-68612.png)
(1)求证:MN∥平面PAD。
(2)求证:MN
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-68612.png)
(3)若PD与平面ABCD所成的角为450,
求证:MN
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-68612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-30349.png)
答案
(2)证CD
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-68612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-68612.png)
(3)证MN
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002343-68612.png)
解析
核心考点
试题【(12分)在四棱锥P-ABC中,底面ABCD是矩形,PA平面ABCD,M,N分别是AB,PC的中点。(1)求证:MN∥平面PAD。(2)求证:MNCD.(3)若】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002333-71628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-86255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-79397.png)
①点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-79397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-89048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-65106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-55528.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-65106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002335-60142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002334-65106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002335-90978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002335-74635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002335-66034.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002313-99856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002314-27891.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002314-77663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002314-37934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002314-76379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002315-60162.png)
其中正确结论的序号是:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002302-72201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002302-75296.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002303-60030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002303-31463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002303-30053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002303-27031.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002304-42789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002304-70444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002304-41586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002304-79936.png)
其中所有真命题的序号是 .
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002250-20502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002250-15590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002250-77355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002250-99847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002251-68276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002251-97760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002251-44547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002251-39144.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002252-98156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002252-45578.png)
(Ⅱ)证明
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002252-50815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002252-88421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021002252-55807.png)
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