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Tất cả Toán Vật lý Hóa học Sinh học Ngữ văn Tiếng anh Lịch sử Địa lý Tin học Công nghệ Giáo dục công dân Âm nhạc Mỹ thuật Tiếng anh thí điểm Lịch sử và Địa lý Thể dục Khoa học Tự nhiên và xã hội Đạo đức Thủ công Quốc phòng an ninh Tiếng việt Khoa học tự nhiên
Mua vip
NV
Nguyễn Văn Anh Kiệt
26 tháng 8 2016 - olm

Cho tam giác ABC vuông ở A vẽ phía ngoài tam giác ấy các tam giác đều BAD và CAE vuông cân tại A.Vẽ AH vuông góc với BC,AH cắt DE ở K. Cm:K là trung điểm DE
#Hỏi cộng đồng OLM #Toán lớp 7
0
TT
Trần Thu Hiền
26 tháng 8 2016

Cho tam giác ABC vuông ở A vẽ phía ngoài tam giác ấy các tam giác đều BAD và CAE vuông cân tại A.Vẽ AH vuông góc với BC,AH cắt DE ở K. Cm:K là trung điểm DE
#Hỏi cộng đồng OLM #Toán lớp 7
1
NK
Nguyễn Kim Thảo
23 tháng 3 2017

vừa vuông cân vừa đều là sao

Đúng(0)
LT
Lê Thanh Vy
24 tháng 3 2017

\(\Delta BAD\) đều

\(\Delta CAE\) vuông cân tại A nhé bạn!

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NM
Nguyễn Mai Anhh
3 tháng 2 2020 - olm

Cho tam giác ABC. Vẽ ở phía ngoài tam giác ấy các tam giác BAD, CAE vuông cân tại A. Vẽ AH vuông góc với BC, đường thẳng HA cắt DE ở K. Chứng minh rằng K là trung điểm của DE
#Hỏi cộng đồng OLM #Toán lớp 7
1
F
FuryGons
18 tháng 3 2020

Hỏi lằm hỏi lốn

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MT
Mai Thanh
2 tháng 1 2022

Cho tam giác ABC vuông tại A. Vẽ ở phía ngoài tam giác ấy các tam giác BAD, CAE vuông cân tại A. Vẽ AH vuông góc với BC, đường thẳng HA cắt DE ở K. Chứng minh rằng K là trung điểm của DE
#Hỏi cộng đồng OLM #Toán lớp 7
0
NH
Nguyễn Hồng Anh
27 tháng 2 2018 - olm

cho tam giác ABC. dựng ra phía ngoài tam giác abc là các tam giác abd và ace là các tam giác vuông cân rại đỉnh A ké ah vuông góc với BC đường thẳng AH cắt de tại m vẽ DI và EK cùng vuông góc với AH chứng Minh rằng :

a, DI=EK=AH

b, M là trung điểm của DE
#Hỏi cộng đồng OLM #Toán lớp 7
6
BH
Bạch Hoàng Anh Thư
27 tháng 2 2018

khó qá kết bạn nhé?

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BH
Bạch Hoàng Anh Thư
27 tháng 2 2018

hic em chào chị em mới lớp 5 em thật vô lễ qá xin lỗi chị

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HT
Hoàng Trang
20 tháng 7 2015 - olm

1. Cho tam giác ABC vuông ở A có AB<AC. AH vuông góc với BC tại H, D là điểm trên cạnh BC sao cho AD=AB. Vẽ DE vuông góc với BC tại E. Chứng mih rằng AH=HE.

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
#Hỏi cộng đồng OLM #Toán lớp 7
12
CL
Cao Linh Chi
13 tháng 2 2016

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CV
CUTE vô đối
7 tháng 3 2017

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L
LUFFY
23 tháng 1 2017 - olm
Cho tam giác ABC có góc A nhọn, phía ngoài tam giác vẽ các tam giác vuông cân tại A là ABD, ACE. Gọi M là trung điểm của BC. Cm AM = 1/2 DE và AM vuông góc DECho tam giác ABC có góc A nhọn, phía ngoài tam giác vẽ các tam giác vuông cân tại A là ABD, ACE. Gọi M là trung điểm của BC. Cm AM = 1/2 DE và AM vuông góc DECho tam giác ABC có góc A nhọn, phía ngoài tam giác vẽ các tam giác vuông cân tại A là ABD, ACE. Gọi M là...
Đọc tiếp

Cho tam giác ABC có góc A nhọn, phía ngoài tam giác vẽ các tam giác vuông cân tại A là ABD, ACE. Gọi M là trung điểm của BC. Cm AM = 1/2 DE và AM vuông góc DECho tam giác ABC có góc A nhọn, phía ngoài tam giác vẽ các tam giác vuông cân tại A là ABD, ACE. Gọi M là trung điểm của BC. Cm AM = 1/2 DE và AM vuông góc DECho tam giác ABC có góc A nhọn, phía ngoài tam giác vẽ các tam giác vuông cân tại A là ABD, ACE. Gọi M là trung điểm của BC. Cm AM = 1/2 DE và AM vuông góc DE
#Hỏi cộng đồng OLM #Toán lớp 7
0
VT
vietphuonghat76 Trinh
8 tháng 4 2018 - olm

Cho tam giác ABC có góc A nhọn. Vẽ phía ngoài tam giác ABC ,tam giác BAD vuông cân tại A và tam gác CAE vuông cân tại A. Chứng minh: 

a/ DC = BE ; DC _|_ BE b/ BD² + CE² = BC² + DE² 

c/ Đường thắng qua A vuông góc với DE cắt BC tại K. Chứng minh K là trung điểm của BC. 
#Hỏi cộng đồng OLM #Toán lớp 7
0
NT
Nguyễn Thị Ngọc Ánh
7 tháng 8 2016

1) Tam giác ABC vuông tại A. Vẽ ở phía ngoài các tam giác ABD, ACE vuông cân tại A. Có AH là đường cao tam giác ABC, AH cắt DE tại K. CMR: K là trung điểm DE. 

2) Cho tam giác cân ABC, M bất kì thuộc BC. Kẻ ME, MF vuông góc với AC, AB. Kẻ BH vuông góc AC. Chứng minh ME + MF = BH
#Hỏi cộng đồng OLM #Toán lớp 7
0
HT
Hà Thị Ánh Tuyết
25 tháng 3 2020 - olm

Cho  tam giác ABC. dựng phía ngoài tam giác ABC các tam giác ABD và tam giác ACE là các tam giác vuông cân tại A. kẻ AH vuông góc với BC. đường thẳng AH cắt DE tại M. vẽ DI và EK cùng vuông góc với AH, CMR:

a, DI = EK = AH

b, M là trung điểm của DE

giúp mình làm càng sớm càng tốt ( thêm hình nữa nha:))
#Hỏi cộng đồng OLM #Toán lớp 7
0
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Tất cả Toán Vật lý Hóa học Sinh học Ngữ văn Tiếng anh Lịch sử Địa lý Tin học Công nghệ Giáo dục công dân Âm nhạc Mỹ thuật Tiếng anh thí điểm Lịch sử và Địa lý Thể dục Khoa học Tự nhiên và xã hội Đạo đức Thủ công Quốc phòng an ninh Tiếng việt Khoa học tự nhiên
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