题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-70352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-87339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-37327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-42566.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-17553.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-41534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-70352.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-80039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-52395.png)
解析
试题分析:(Ⅰ) 对于
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-42566.png)
试题解析:(Ⅰ)由已知及正弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033411-61136.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033411-11224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033411-64411.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033411-97828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033411-83574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-80039.png)
(Ⅱ) ⊿
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033412-51181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033412-35172.png)
由已知及余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033412-39396.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033412-38726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033412-57416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033413-89419.png)
因此⊿
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033412-51181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-52395.png)
核心考点
举一反三
(Ⅰ)求A;
(Ⅱ)若a=2
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033400-57616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033400-75590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-33479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-73828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-82183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-71046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-70567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-68424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-82598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033353-59967.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-73828.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033353-25911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-33479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033341-15186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-29882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-66632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-30372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-12642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033341-15186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-84679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-30372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-73206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-23505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-42315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-53211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-74062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-36789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-73154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-14230.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-53211.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033345-12082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033345-76339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033345-44856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033336-62055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033337-22056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033337-21723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033337-43379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033336-62055.png)
A.正三角形 | B.等腰三角形 |
C.等腰直角三角形 | D.等腰三角形或直角三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033329-39453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033329-11544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033329-75163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033329-78446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033330-49317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033330-58659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033330-68220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033330-52142.png)
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