题目
题型:福建省模拟题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010230-35961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010230-42088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010230-29546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010230-63105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010231-17687.png)
B. 5
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010231-14353.png)
D.13
答案
核心考点
试题【已知向量,,且,则的值为 [ ]A. B. 5 C. D.13】;主要考察你对平面向量模和夹角的坐标表示等知识点的理解。[详细]
举一反三
B.若a⊥b,则|a+b|=|a|-|b|
C.若|a+b|=|a|-|b|,则存在实数λ,使得a=λb
D.若存在实数λ,使得a=λb,则|a+b|=|a|-|b|
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010221-90097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010221-60274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010222-34601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010218-15373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010218-85068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010213-59064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010214-91241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010214-83331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010214-15503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010214-98943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010204-76994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010205-26864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010205-26177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010205-88248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010205-18477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010206-34728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010206-64015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010206-47861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010206-21146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010206-24101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010207-79639.png)
题型:
|sinθ.如果|
|=
,|
|=2,
×
=﹣12,那么|
×
|等于
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010207-39615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010207-82088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010207-80964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010208-35995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010208-87465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010208-89573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010208-59123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105010209-11338.png)
B.﹣5
C.12
D.﹣12