题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084424-53674.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084424-38909.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-99513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-57419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-91992.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-70263.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084426-92013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084426-12556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084426-85273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084427-77775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084427-90194.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084427-16069.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084428-53212.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084428-63586.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084428-74554.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084428-66329.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-91992.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-70263.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084426-92013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084429-15255.gif)
显然
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084429-71258.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084429-42738.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084427-90194.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084429-37252.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084430-90609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084428-74554.gif)
(2)由于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084430-57998.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084430-45330.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084430-78450.gif)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084425-57419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084431-59977.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084431-62828.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084431-67665.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084431-39285.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084432-32962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084427-77775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084432-55751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084428-66329.gif)
核心考点
试题【(本小题满分14分)设向量,向量,.(1)若向量,求的值;(2)求的最大值及此时的值.】;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/20191104/20191104084417-13757.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084417-26469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-46846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-75018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084417-26469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-46846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-28397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-75018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-28397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084417-26469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084418-46846.gif)
A.充要条件 | B.充分不必要条件 |
C.必要不充分条件 | D.既不充分又不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-60577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-50293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-60577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-50293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-50293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-60577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084412-50293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084413-20966.gif)
A.充分非必要 | B.必要非充分 | C.充分且必要 | D.非充分且非必要 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084409-89984.gif)
A.7 | B.-7 | C.-25 | D.25 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084358-68080.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084358-89931.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084359-33348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084359-35557.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084359-13635.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084353-18978.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084353-59986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084353-29752.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084353-35150.jpg)
A
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084354-86053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084354-61736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104084353-35150.jpg)
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