题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034442-22005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034442-55623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034442-50038.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034442-75805.png)
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034442-37326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034443-83055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034443-34831.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034443-31541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034443-30594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034444-62463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034444-66451.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034444-36279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034444-12817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034444-36195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034445-88765.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034445-38022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034445-64395.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034445-26811.png)
整理可得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034446-23639.png)
综上可得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034444-66451.png)
核心考点
试题【在直角坐标系中,分别是与x轴,y轴平行的单位向量,若直角三角形ABC中,,则实数m=________________.】;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/20191104/20191104034437-74572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034437-41242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034437-16631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034437-74572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034430-47316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034430-49298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034431-86384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034431-15728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034431-97056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034431-49637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034432-65071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034432-34516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034420-61078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034420-86606.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034420-92188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034420-92188.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034421-53989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034420-92188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034410-51116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034410-90618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034410-81034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034411-79122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034400-15714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034400-72028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034400-34373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034401-20126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034401-62579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034401-92973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104034401-87476.png)
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