题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075139-57386.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-95357.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-67051.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-41688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-17130.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-39357.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-89734.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075139-57386.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-96742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-93046.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-77948.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-89521.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-84278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-59147.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-89422.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-21982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-71979.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-39676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075142-41996.gif)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075140-96742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075142-12004.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075142-70123.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075141-89521.gif)
点拨:向量的数量积经常涉及到,要足够重视.且对三角函数的化简、求值、证明要加强练
核心考点
举一反三
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075129-76970.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075129-89389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075130-53938.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075130-94378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075130-16912.gif)
1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075130-33160.gif)
2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075130-62318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075131-24495.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075131-76543.gif)
已知ΔABC中,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075125-29506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075121-26397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075121-37022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075116-67101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075116-36517.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075116-95979.gif)
已知向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075101-21921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075101-56414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075102-80700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075102-63059.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075102-31298.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075102-69853.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075103-48073.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075102-31298.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075103-86870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075103-86639.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075103-33209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075104-72711.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075104-83595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075104-64812.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075104-25571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075104-30955.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075105-72707.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075105-96312.gif)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075104-72711.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075103-33209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075105-23472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075105-32526.gif)
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