题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023732-12839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023733-21960.gif)
正偶数,则向量
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023733-15369.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023733-21960.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023733-62403.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023724-62207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023724-33775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023724-98715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023725-84888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023725-98403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023725-48633.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023714-72769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023714-10128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023714-75353.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023714-99692.gif)
(1)求以线段
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-35285.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-30681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-41818.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-55932.gif)
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-30681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-33526.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-47895.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023715-68108.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023704-76583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023704-19967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023704-67376.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023659-57296.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023659-32924.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023659-13289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023659-83728.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023700-37200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023700-32879.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023700-16953.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023648-77175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023648-20182.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023648-83847.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023648-56381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023649-82975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023649-29511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023649-62403.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023649-82110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023649-74489.gif)
(Ⅱ)如图2,设
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023650-19319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023650-20621.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023650-63416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023650-19319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023649-62403.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023650-74442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023651-44704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023651-88892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023651-65711.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023652-48157.gif)
定值;若不是定值,请说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023652-63090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105023652-77933.gif)
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