题目
题型:不详难度:来源:
在△ABC中,角A,B,C的对边分别是a,b,c,且A,B,C成等差数列.
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054308-49211.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054308-12413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-15129.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-50776.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-36024.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054308-49211.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054308-12413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-53610.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054308-12413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-94687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054310-40456.gif)
因为b=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-15129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054310-73961.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054310-55632.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054310-13159.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054311-79041.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054311-38665.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-50776.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054311-29244.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054311-48588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054311-97972.gif)
因为0<C<
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054312-33274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054311-97972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054312-92467.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054309-50776.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054312-92467.gif)
解析
核心考点
试题【本小题满分14分)在△ABC中,角A,B,C的对边分别是a,b,c,且A,B,C成等差数列.(1)若=,b=,求a+c的值;(2)求的取值范围.】;主要考察你对解三角形应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054304-25404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054304-30755.gif)
已知点A(3,0),B(0,3),C(
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054259-44940.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054259-88038.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054259-22298.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054259-51885.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054300-20963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054300-32278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054259-22298.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054300-37519.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054300-67846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054250-92452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054250-97854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054250-17034.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054250-48705.gif)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054244-48060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054244-26402.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054244-25239.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054245-42038.gif)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054245-46991.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054244-48060.gif)
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