题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105130-89131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105130-16011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-59390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-32810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-94497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-81313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-63846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-49337.png)
⑴若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-60314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105133-79339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105133-57274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105133-22255.png)
⑵若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105133-47965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-61342.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-20189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-61342.png)
解析
试题分析:(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-32810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-94497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-81313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-63846.png)
由△ADE∽△BGE 得 AD :BG = AE:BE =" 1" :3
∴BG =" 3" AD
点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105130-89131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105130-16011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-59390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-94115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-19657.png)
由△ADF ≌△ CGF得 AD=CG
∴BG =" 3" CG ∵BC = 8 ∴BG=12,
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-98248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-32810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-94497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105132-81313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105135-92893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105135-50639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105135-73872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105133-47965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105135-40837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105136-48420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-20189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105136-36009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105136-89108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105130-89131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105130-16011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105131-59390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105134-61342.png)
点评:本题考查三角形相似,全等三角形,解答本题需要考生掌握三角形相似的判定方法,三角形全等的判定方法,熟悉三角形相似,全等三角形的性质
核心考点
举一反三
A.∠A∶∠B∶∠C = 1∶1∶2 | B.a∶b∶c =1∶1∶![]() |
C.![]() | D.∠A+∠B=2∠C |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105120-24267.png)
①两条直线平行,同旁内角互补
②同位角相等,两直线平行
③内错角相等,两直线平行
④同一平面内,垂直于同一直线的两直线平行
A.① | B.②和③ | C.④ | D.①和④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105114-78882.png)
(1)若∠AMN=50º,∠EPN=70º,分别求∠MNP,∠DNQ的度数;
(2)若∠AMN=
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105114-51969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105114-56291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105114-51969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105114-56291.png)
(3)试探究:∠DNQ与∠AMN,∠EPN之间的数量关系,并说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105104-28705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105105-80695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105105-18700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021105105-25757.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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