题目
题型:陕西省期末题难度:来源:
(1)若k∈R,且k
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223904-15973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-16346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-51042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-51900.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-70834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-81466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-37566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-14455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223905-87062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-74444.png)
(3)若不平行的两个非零向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-45801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-69388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-70495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-68559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223906-20638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-97042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-95408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-41091.png)
(4)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-97562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223907-66761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223908-17385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223908-74223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223908-51778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-21331.png)
(5)(
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-27480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-78989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223909-48510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223910-46952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223910-73054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223910-41331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223911-67550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223911-79028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223911-47678.png)
其中真命题的个数是
B.1
C.2
D.3
答案
核心考点
试题【已知下列命题中:(1)若k∈R,且k=,则k=0或=,(2)若·=0,则=或=(3)若不平行的两个非零向量,满足||=||,则(+)·(﹣)=0(4)若与平行,】;主要考察你对四种命题的概念等知识点的理解。[详细]
举一反三
B.若b?α,b∥c,则c∥α
C.若c∥α,α⊥β,则c⊥β
D.若c∥α,c⊥β,则α⊥β
①若命题P和命题Q中只有一个是真命题,则
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223855-13945.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223855-53256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223855-37210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223855-37179.png)
③若定义在R上的函数y=f(x)满足f(x+1)=1﹣f(x),则f(x)是周期函数;
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223856-29472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223856-94065.png)
其中所有正确命题的序号是( )
B.若b?α,b∥c,则c∥α
C.若c∥α,α⊥β,则c⊥β
D.若c∥α,c⊥β,则α⊥β
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223847-97331.png)
B.(¬p)∨q为真命题
C.p∧(¬q)为真命题
D.(¬p)∧(¬q)为真命题
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223843-34662.png)
B.若α∥β,l⊥α,则l⊥β
C.若l∥α,m
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102223843-41649.png)
D.若α⊥β,α∩β=l,m?α,m⊥l,则m⊥β
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