题目
题型:福建省月考题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023203-19010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023203-75199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023203-75885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023203-31578.png)
(2)若AB=AD,试求△ADC的周长的最大值.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023203-61253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023204-83706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023204-81226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023204-85414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023204-17353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023204-21318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023205-55523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023205-48226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023205-84437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023205-31876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023206-66656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023206-27048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023206-96757.png)
在△ADC中,由余弦定理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023206-15959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023207-63412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023207-83870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023207-16158.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023207-65509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023208-54956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023208-84902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023208-89784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023208-35705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023208-37217.png)
在△ADC中,根据正弦定理,可得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023209-27118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023209-10470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023209-28033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023209-48621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023210-19480.png)
=8(sinC+
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023210-93233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023210-24506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023210-41058.png)
=8(
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023211-54486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023211-98212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023211-22285.png)
=8sin(C+
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023211-39901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023211-15565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023212-33603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023212-85424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023212-53792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023212-18041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023212-17301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023213-20449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023213-35089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023213-14059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023213-26408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023214-88502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023214-87929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023214-32567.png)
核心考点
试题【如图,在△ABC中,已知B=,AC=4,D为BC边上一点. (1)若AD=2,S△DAC=2,求DC的长;(2)若AB=AD,试求△ADC的周长的最大值.】;主要考察你对余弦定理等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023158-84308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023158-65213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023151-74657.png)
(1)若△ABC的面积等于
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023151-83625.png)
(2)若sinC+sin(B﹣A)=2sin2A,求△ABC的面积.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023145-81761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023145-80488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023145-82773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023138-44551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023138-59168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023139-63767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023139-91442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023139-97015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023139-37739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020023140-63506.png)
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