题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-82787.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-83457.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-16535.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-85918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-33290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-45529.png)
解析
试题分析:(1)直接由向量的运算法则即可得.
(2)将(1)小题的结果代入得:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-96051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-14456.png)
将
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-36585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-15082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-96954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-67807.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043427-27486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043427-73702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043427-47369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043427-25252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043428-51951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043428-80312.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043428-23820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043428-50464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-96954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043429-41536.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043429-80067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-96954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043426-67807.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043427-25252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043429-55352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043429-46313.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043428-51951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043430-22790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043429-46313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043430-76368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043430-28802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-45529.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043428-80312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043430-61849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043429-46313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043431-31971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043431-90205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043431-18012.png)
综上得:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043425-45529.png)
核心考点
试题【(1)求(2).】;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/20191104/20191104043414-75497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043415-94027.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043415-58962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043415-72813.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043416-64323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043416-82228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043409-24239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043409-20686.png)
A.![]() | B.![]() | C.4 | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043403-76637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043404-39325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043404-69257.png)
A.-1 | B.![]() | C.![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043357-53586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043358-80387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043358-74865.png)
A.6 | B.![]() | C.-12 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043349-31554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043350-46422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043350-41201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043350-74225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043350-26967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043349-31554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104043350-46422.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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