题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032607-94976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-80800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-33602.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-78756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-48349.png)
(2)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-88716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-54016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-24801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-52605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-15741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-92764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-78756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-79332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-52605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-12635.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-21168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-34566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-41986.png)
解析
试题分析:(1)首先根据向量和的坐标运算和向量数量积的坐标表示将函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-78756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032611-66692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032611-69243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032611-10829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032611-34660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032611-19570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032612-27894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032612-55690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032612-57164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-78756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-79332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032609-92764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032612-97029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032612-18146.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032613-75397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032613-96502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032613-15145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032613-69472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032614-90109.png)
(2)由(1)知:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032614-10121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032614-50273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032614-23712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032614-78877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032615-88622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032608-78756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032615-12428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032615-32893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032614-78877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032615-13424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-34566.png)
由余弦定理,得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032615-55033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032616-38635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032610-41986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032616-96188.png)
核心考点
举一反三
(Ⅰ)求B;
(Ⅱ)若sinAsinC=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032555-26929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032547-95186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032548-38330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032548-31264.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032548-75905.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032548-96570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032547-95186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032542-69820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032542-87509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032542-38063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032542-84664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032543-43265.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032535-45023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032535-85314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032535-31594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032536-50499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032536-69840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032527-12970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032528-89699.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032528-55401.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032528-38895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032527-12970.png)
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