题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054316-16738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054317-80586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054317-69682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054317-72833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054317-95122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054317-19651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054318-10489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054318-79920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054316-16738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054318-21325.png)
A.68米 | B.70米 | C.121米 | D.123米 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054318-32872.jpg)
答案
解析
在Rt△CEH中,∠CEH=90°-∠EO"P"=45°,∴EH=CH=(x-1.6),
在Rt△CAH中,∠CAH=90°-∠AOP=30°,∴AH=
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054319-28361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054319-28361.png)
∵AH-EH=AE=BF=50,∴
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054319-28361.png)
解得x=25(
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054319-28361.png)
故选B。
核心考点
试题【一次数学活动中,小迪利用自己制作的测角器测量小山的高度.已知她的眼睛与地面的距离为1.6米,小迪在处测量时,测角器中的(量角器零度线和铅垂线的夹角,如图);然后】;主要考察你对相似图形性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054310-15830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054310-82846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054310-82846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054310-61736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054311-85758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054304-25867.png)
(1)画
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054305-18756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054305-26174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054305-64093.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054305-40436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-36163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-65931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-66318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-81323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-31657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-36163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-70751.png)
(1)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-36163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-65931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-31657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-36163.png)
①如图1,若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-23009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-44074.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-52733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-89816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-39795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-23487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-19258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-29574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-35011.png)
②如图2,若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-41382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-44741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-65931.png)
(2)如图3,若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-36163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054257-65931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-36807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054258-50255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054259-51756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054251-31734.png)
A.2.5 | B.3 | C.4 | D.5 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054246-86608.png)
(1)观察: ①如图2、图3,当∠CDF="0°" 或60°时,AM+CK_______MK(填“>”,“<”或“=”).
②如图4,当∠CDF="30°" 时,AM+CK___MK(只填“>”或“<”).
(2)猜想:如图1,当0°<∠CDF<60°时,AM+CK_______MK,证明你所得到的结论.
(3)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054246-91240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103054247-83858.png)
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