题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043117-77357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043117-96403.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043117-91864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043117-69916.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043117-14706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043118-98784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043118-20719.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043118-90160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043118-47030.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043118-12378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043119-14289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043119-19153.png)
其中错误命题的序号是_____
答案
解析
【错解分析】:③④⑤中未考虑
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043119-35325.png)
【正解】①
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043119-92944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043120-60927.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043120-25880.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043120-75733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043120-69230.png)
显然
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043120-56175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043120-69230.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043121-21318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043121-79927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043121-58394.png)
⑤
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043121-46341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043122-97413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043122-97897.png)
【点评】对三角形中问题的复习,主要是正、余弦定理以及解三角形,要掌握基本知识、概念、公式,理解其中的基本数量关系,对三角形中三角变换的综合题要求不必太难.
核心考点
试题【在中,已知,b,c是角A、B、C的对应边,则①若,则在R上是增函数;②若,则ABC是;③的最小值为;④若,则A=B;⑤若,则,其中错误命题的序号是_____】;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/20191020/20191020043110-23579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043111-85520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043110-23579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043051-46980.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043051-60109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043051-43784.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043051-75686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043051-74174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043052-80002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043051-74174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043045-35543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043045-41808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043045-96519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043045-35185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043046-71288.png)
A.![]() | B.![]() | C.![]() | D.![]() |
已知△
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043037-66073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043037-70539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043037-51045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043037-64772.png)
(1) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043038-89083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043038-64230.png)
(2) 若△
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043037-66073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043038-51463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043038-79346.png)
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