题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-86553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-88618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-75285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-76977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-66766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-88618.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-81628.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-72544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-29377.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-24598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-30515.png)
④对于任意向量
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-88301.png)
其中真命题的序号为__________.
答案
解析
试题分析:①因为
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-35713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-31159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-31002.png)
故①为真命题;
②设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-22947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-16171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-76977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-17279.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-81202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-16691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-40235.png)
第一:若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-76977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-16691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-75239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-29377.png)
第二:若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-69081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-16691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-75239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-29377.png)
第三:若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-76977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093831-95535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-75239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-29377.png)
第四:若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093830-69081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093831-95535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093831-80789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093831-58533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093831-84251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-29377.png)
所以②是真命题
③设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093832-20778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093832-96317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093832-34147.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-24598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-76977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093828-66766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093832-85203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093832-32817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093833-20700.png)
所以是真命题.
④设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093833-73821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093833-98102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093829-24598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093833-87678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093834-40587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093834-79731.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093834-60223.png)
综上答案应填①②③.
核心考点
试题【在实数集R中,我们定义的大小关系“>”为全体实数排了一个“序”.类似的,我们在平面向量集上也可以定义一个称“序”的关系,记为“”.定义如下:对于任意两个向量当且】;主要考察你对平面向量的概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093816-53795.png)
A.若![]() |
B.若![]() |
C.若![]() ![]() ![]() |
D.若存在实数![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093809-27272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093810-47032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093810-20181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093810-43290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093803-69369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093803-14858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093804-93445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093804-97936.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093755-92273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093755-65581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093756-59828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093756-19996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093756-70086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093756-78450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093757-80593.png)
.
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093746-17621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093746-24430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093746-78581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103093747-17527.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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