题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-78991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-67137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-61688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-92972.png)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-44489.png)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-61888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-78991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-72757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-25248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-60422.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032702-17186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032702-83802.png)
解析
试题分析:(I)在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-92972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032702-12238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032702-38093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032703-93709.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032700-92972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032703-82603.png)
再移项合并得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032703-49388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032703-70746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-44489.png)
(II)面积公式用哪一个?因为由(I)可得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032703-68751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-43173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-70498.png)
为了求出
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-70212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-70212.png)
因为已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-61888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-44489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-70212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-82664.png)
这样联立①②便可求出
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-70212.png)
试题解析:(I)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032705-56018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032705-32814.png)
(II)由(I)得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032705-80693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032705-87361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032704-70498.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032701-61888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032705-10999.png)
联立①②得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032706-49517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032706-46448.png)
综上:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032702-83802.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032654-70754.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032654-38864.png)
(Ⅱ)若cosB=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032654-93552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032654-95596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032655-94213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032647-12127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032648-25862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032648-24208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032648-85678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032648-61725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032648-15843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032649-19582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032649-94420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032644-65996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032644-69117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032634-25320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032635-57002.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032635-53057.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032635-44736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032629-28411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032630-71023.png)
A.5或3 | B.5 | C.3 | D.5或6 |
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