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Phạm Quý Hưng
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Hồ Thu Giang
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Trần Thị Loan
15 tháng 8 2015 lúc 14:02

dòng cuối: em sửa lại kết luận:  tam giác DIE vuông nhé!

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chu thi thuy van
25 tháng 8 2017 lúc 21:40

2. Cho tam giác ABC vuông cân tại A.. Qua A vẽ đường thẳng d ở ngoài tam giác ABC . Vẽ BD vuông góc với d taị D. CE vuông góc với d tại E. M là trung điểm CB. Chứng minh rằng:

a) BD + CE = DE

b) Tam giác MDE là tam giác vuông cân

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Đào Thị Phương Mai
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HÀ DUY KIÊN
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Trần Minh Hoàng
31 tháng 12 2020 lúc 12:10

Mình nghĩ M là trung điểm của BC.

Xét tam giác MAE và tam giác MBD có: MA = MB (do tam giác ABC vuông cân tại A), AE = BD (chứng minh trên), \(\widehat{MBD}=\widehat{MAE}\).

Do đó \(\Delta MAE = \Delta MBD(c.g.c)\Rightarrow MD=ME; \widehat{AME}=\widehat{BMD})\Rightarrow MD=ME; \widehat{EMD}=\widehat{AMB}=90^o\Rightarrow\text{Tam giác MDE vuông cân tại M}\).

 

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Trần Minh Hoàng
31 tháng 12 2020 lúc 12:02

Ta có \(\Delta ADB=\Delta CEA\left(g.c.g\right)\)

\(\Rightarrow BD=EA\).

Do đó \(BD^2+CE^2=EA^2+CE^2=AC^2\) không đổi.

 

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Nguyễn Thảo Vy
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Lê Trần Bảo Ngọc
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neko Miru
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Phùng Nguyễn Huy Toàn
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Kaito Kid
13 tháng 2 2016 lúc 16:01

a) Ta có BD và CE đều vuông góc với d

   Nên góc CEA=góc BDA (=90 độ)

  Mà 2 góc này ở vị trí đồng vị

  Nên BD//CE

b)  Ta có d// BC

  ---------> góc ECB=góc DBC=góc CED ( =90 dộ )

 Nên ECDB là HCN

Mà ABC là vuông cân            nên góc ECA=góc  DBA= 45 độ

-------->tam giác CEA = tam giác DBA ( cạnh huyền góc nhọn)

c)( mình lười bấm quá nên mình làm tắt nha)

 Chứng minh góc CAE= góc BAD   ( do góc ECA= góc DBA  và góc ACB=góc EAC=45 độ do ED//BC)

 Nên CE=EA và DB=AD, mặt khác AE=AC ( do 2 tam giác bằng nhau cm câu b)

 

 

 

 

   

 

  

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Hoàng Trang
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Cao Linh Chi
13 tháng 2 2016 lúc 11:30

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CUTE vô đối
7 tháng 3 2017 lúc 20:37

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

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cô nàng bạch dương
18 tháng 3 2017 lúc 12:04

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