题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054357-37155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054357-39309.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054357-99170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-95418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-57083.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-57083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-12602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-13833.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-95282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-80693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-36958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-16357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-57083.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-89591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-28988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-85456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-69664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-70031.png)
其中命题正确的是 .(填序号)
答案
解析
试题分析:对于①若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054357-99170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054358-95418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054401-83845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-95282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-80693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-36958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-16357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054401-83845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054359-89591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-28988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-85456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-69664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054400-70031.png)
点评:解决此类题目的关键是能否根据相应的判定定理与性质定理进行推理并结合空间想象能力进行判断。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054348-44066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054348-25616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054348-16471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054348-36126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054349-43180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054349-80101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054349-52752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054349-48017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054350-17348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054350-86792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054339-30337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054340-36478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054340-59533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054340-34474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054340-60290.png)
求证:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054341-90658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054341-14432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054329-92225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054329-37884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-44095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-44698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-41138.jpg)
(1)求四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-34628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-18937.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-43473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-19707.png)
(3)试问:在线段
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054330-77409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054331-24419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054331-26354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054331-24569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054331-24419.png)
如图,已知平面QBC与直线PA均垂直于
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054309-48768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054309-50936.png)
(Ⅰ)求证:PA∥平面QBC;
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054309-67356.png)
A.α∥β,m⊥α,则m⊥β |
B.m∥n,m⊥α,则n⊥α |
C. n∥α,n⊥β,则α⊥β |
D.α![]() |
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