题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041425-56320.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:2a
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041425-56320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041425-56320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041425-56320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041426-20690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041427-46370.png)
核心考点
试题【已知空间向量a=(1,n,2),b=(2,1,2),若2a-b与b垂直,则|a|等于 ( )A.B.C.D.】;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/20191104/20191104041416-62874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041416-26685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041416-23430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041416-56010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041417-59386.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041417-37520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041417-45502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041417-78813.png)
其中正确的为( )
A.②③④ | B.①②⑤ | C.④⑤ | D.③④⑤ |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041407-19581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041407-22885.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041407-46225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041407-14554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041408-71361.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041408-47074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041408-13682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041408-35657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041408-15941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041359-63234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041400-48420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041400-99163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041400-77277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041400-41618.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041401-56142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041401-41031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041401-24242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041343-50238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041343-19691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041343-85426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041344-40485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041344-20303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041344-64677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041344-93195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041343-50238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041343-85426.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041344-27163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041345-27860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041345-60959.png)
(2)判断
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041345-46818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041345-83209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041346-71303.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041346-49666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041343-50238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041337-71006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041337-30455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041338-28578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041337-71006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041338-73587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104041338-37748.png)
A.1 | B.3 | C.5 | D.7 |
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