题目
题型:不详难度:来源:
①若平面
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-62197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-88852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-28428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-82668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-47331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-76313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-99580.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-61748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-17949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-10758.png)
③过空间任一点,可以做两条直线和已知平面
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-62197.png)
④平面
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-62197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-88852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-79494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072750-65283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-88852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-65938.png)
⑤若点
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-19537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-19537.png)
⑥
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-24250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-19537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-19537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-24250.png)
其中正确的命题是 .
答案
解析
对于②:a,c也可能相交,所以错.
对于③:过空间任一点,只能做一条直线与已知平面
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072749-62197.png)
对于④:可以采用反证法证明此结论正确.
对于⑤:因为PA=PB=PC,设P在平面ABC内的射影为O,则OA=OB=OC,所以点O为三角形的外心,正确.
对于⑥:如果
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-19537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-19537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072751-24250.png)
核心考点
试题【下面给出的几个命题中:①若平面//平面,是夹在间的线段,若//,则;②是异面直线,是异面直线,则一定是异面直线;③过空间任一点,可以做两条直线和已知平面垂直;④】;主要考察你对简单逻辑联结词等知识点的理解。[详细]
举一反三
A.命题“若![]() ![]() ![]() ![]() ![]() |
B.若命题![]() ![]() |
C.![]() ![]() ![]() |
D.若向量![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072731-38278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072732-30352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072732-68318.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072731-38278.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072732-47455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072731-38278.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072732-15595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072731-38278.png)
④ 当
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072733-87732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072731-38278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072733-94188.png)
A.①③ | B.①④ | C.②③ | D.②④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072723-42015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072723-33072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072723-11603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072723-57668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072723-53920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072723-80450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072724-24521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072724-54024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072724-75274.png)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() |
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