题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105633-22566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105633-46908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105633-97536.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105633-56253.png)
解析
试题分析:∵sin∠CBD=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105634-90300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105634-34321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105634-72483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105634-90300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105635-67728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105635-43760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105633-56253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105635-30872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105635-27464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105635-45005.png)
解:在Rt△DBC中,∠C=90,sin∠CBD=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105636-23269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105636-87283.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105636-40809.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105637-58966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105637-36985.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105637-82925.png)
AC= AD+CD=2+4=6, 4分
在Rt△ABC中,∠C=90,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105637-99534.png)
点评:熟知三家函数的定义,正弦等于对边比斜边,正切等于对边比邻边。有一点的难度,但不大。属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105626-22107.png)
A.![]() | B.![]() | C.![]() | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105617-44749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105617-62277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105617-98421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-10787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-10787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-10787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-92543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-51047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-76158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105617-98421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-10787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-90161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-46462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105618-35893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105619-28889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105612-12347.png)
A.5m | B.6m | C.7m | D.8m |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105604-77886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105604-44209.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105601-25957.png)
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