题目
题型:不详难度:来源:
设锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044150-74748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044150-62580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-18298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-95272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-86663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-54172.png)
(1) 求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-52037.png)
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-55068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-28081.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-38922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-76285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-53530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-32385.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-95272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-32960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-86663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-50346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-52037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044154-16630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-55068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044154-16908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-53530.png)
(1) 因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044151-95272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044154-17405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-32960.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044154-17476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044154-90340.png)
因为sinB>0,则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-50346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-38922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044152-76285.png)
(2) 因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044155-56319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044155-57385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044155-77508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044155-58023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044154-16908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044156-22490.png)
故函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-53530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044153-32385.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044142-56200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044143-75677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044143-95166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044143-68890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044142-56200.png)
A.![]() | B.![]() | C.![]() | D.![]() |
A.△ABC中,a=7,b=14,A=30°,有两解 | B.△ABC中,a=30,b=25,A=150°,有一解 |
C.△ABC中,a=6,b=9,A=45°,有两解 | D.△ABC中,b=9,c=10,B=60°,无解 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044133-69528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044134-86056.png)
(1)求角B的大小;
(2)若b=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044134-99735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044128-33979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044129-56590.png)
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