题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055935-12348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-45951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-29224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-91146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-48459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055935-12348.png)
A.正![]() | B.等腰![]() |
C.直角![]() | D.等腰直角![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-91146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-48459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055937-34254.png)
又因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055936-29224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055935-12348.png)
核心考点
试题【已知及所在平面一点,符合条件:,且,则的形状为( )A.正B.等腰C.直角D.等腰直角】;主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055929-71633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055929-90258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055930-73974.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055930-62998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055930-68712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055930-71419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055931-42553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055931-40841.png)
④ 已知
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055931-67432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055931-66606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055932-33960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055930-71419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055932-34106.png)
正确答案的序号的有 .
A.e1="(0,0)," e2 =(1,-2) ; | B.e1="(-1,2),e2" ="(5,7);" |
C.e1="(3,5),e2" =(6,10); | D.e1="(2,-3)" ,e2 =![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055919-32317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055915-45815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055915-30200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055915-80829.png)
A.![]() | B.1 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055907-46263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055908-20474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055908-78601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055908-71926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055908-45173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055908-48583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-66080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-23893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-54465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-73780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-25321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-45412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055909-86068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055910-87922.png)
A.1 | B.2 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104055910-75548.jpg)
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