题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015939-99662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015939-35262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015939-93358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-87726.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015941-25689.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015941-67244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015941-99845.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015942-20588.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015942-98909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015942-46454.png)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015942-39953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-15752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015940-96259.png)
此题考点为三角形向量数量积运算.
核心考点
试题【在△ABC中,, , ,则下列推导中错误的是 ( ) A.若·>0,则△ABC为钝角三角形B.若·=0,则△ABC为直角三角形C.】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015934-42280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015935-28983.png)
A.![]() | B.![]() | C.25 | D.5 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015928-47914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015928-91521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015928-57458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015929-51602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015929-32104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015929-20009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015929-28053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015930-43952.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015918-71504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015918-53588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015918-32608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015918-59188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015907-11261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015907-34699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015907-49092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015907-34485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015908-79166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015908-88462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015908-77552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015909-33818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015909-84066.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015910-36929.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015858-18646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015858-62410.png)
(Ⅰ)请列出有序数组(m,n)的所有可能结果;
(Ⅱ)若“使得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015858-18646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015858-18646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015858-62410.png)
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