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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
HT
Hoàng Thị Ngọc Ánh
18 tháng 2 2022
Cho tam giác ABC vuông cân tại A, H là trung điểm của BC, M là điểm nằm giữa B và H. Vẽ MB vuông góc AB tại D, ME vuông góc AC tại E.Chứng minh:a) AH vuông góc với BCb) AD=CE; BD=AEc)MB^2+MC^2=2MA^2Mn giúp mik vs, lát 7h mik phải nộp bài rồi...
Đọc tiếp

Cho tam giác ABC vuông cân tại A, H là trung điểm của BC, M là điểm nằm giữa B và H. Vẽ MB vuông góc AB tại D, ME vuông góc AC tại E.Chứng minh:

a) AH vuông góc với BC

b) AD=CE; BD=AE

c)MB^2+MC^2=2MA^2

Mn giúp mik vs, lát 7h mik phải nộp bài rồi ạgianroi
#Toán lớp 7
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NM
nguyễn mai bằng lòng
19 tháng 2 2018

cho tam giác abc vuông cân tại a. h là trung điểm cạnh bc. m là trung điểm cạnh bc. m là điểm nằm giữa b và h. vẽ md vuông góc ab tại d, me vuông góc với ac tại e. Cm:

a) ah vuông góc với bc

b) ad= ce, bd= ae

c) mb mũ 2 + mc mũ 2= 2ma mũ 2
#Toán lớp 7
0
MT
Mathematics❤Trần Trung Hiếu❤Music
8 tháng 11 2018

cho tam giác ABC vuông cân tại A. H là trung điểm cạnh BC.M là điểm nằm giữa B  và H. Bẽ MD vuông góc AB tại D, ME vuông góc AC tại E .chứng minh rằng : a, AH vuông góc BC

         b, ADb= CE , BD = AE

        c, MB2 + MC2 = 2MA2
#Toán lớp 7
0
LN
Le ngoc phuong linh
31 tháng 12 2017

Giup mink với nha !!

Cho Tam giác ABC vuông cân tại A. H là trung điểm BC. M là trung điểm của B và H. Vẽ MD vuông góc với AB tại D, ME vuông góc với AC tại E . CMR

a) AH vuông góc với BC 

b) AD =CE, BD= AE

c) MB2 + MC2= 2MA2

thanks trước nha !! 
#Toán lớp 7
0
NQ
Nguyễn Quỳnh Anh
19 tháng 12 2020
Cho tam giác ABC vuông góc tại A và AB=AC. Gọi H là trung điểm của BC. Điểm M nằm giữa B và H. Vẽ MD vuông góc với AB tại D. ME vuông góc với AC tại E. CMR a) AH vương góc với BC b) AD = CE; BD=AE c) MB ^2 + MC^2 = 2MA^2
#Toán lớp 7
0
NL
nguyen le phuong thao
19 tháng 2 2018
1.Cho tam giác ABC vuông tại A (AB>AC)a) Cho biết AB= 8cm, BC= 10cm. Tính AC.b) Gọi M là trung điểm cạnh BC. Trên tia đối tia MA lấy D sao cho MD =MA. Vẽ AH vuông góc BC tại H, trên tia đối của tia HA lấy E sao cjo HE=HA. Cứng minh rằng:*CD vuông góc AC         *tam giác CAEcân                 *BD=CE                     *AE vuông góc ED 2.Cho tam giác ABC vuông cân tại A. H là trung điểm cạnh BC. M là điểm nằm giữa B và H. Vẽ MD...
Đọc tiếp

1.Cho tam giác ABC vuông tại A (AB>AC)

a) Cho biết AB= 8cm, BC= 10cm. Tính AC.

b) Gọi M là trung điểm cạnh BC. Trên tia đối tia MA lấy D sao cho MD =MA. Vẽ AH vuông góc BC tại H, trên tia đối của tia HA lấy E sao cjo HE=HA. Cứng minh rằng:

*CD vuông góc AC         *tam giác CAEcân                 *BD=CE                     *AE vuông góc ED

 2.Cho tam giác ABC vuông cân tại A. H là trung điểm cạnh BC. M là điểm nằm giữa B và H. Vẽ MD vuông góc AB tại D, ME vuông góc AC tại E. Chứng minh rằng:

a)AH vuông góc BC         b) AD=CE, BD=AE             c) MB2 + MC2 = 2MA2 

Mình cần gấp, các bạn giải nhanh và đầy đủ giúp mình nhé, cảm ơn.
#Toán lớp 7
0
VT
Vũ Thị Hà Phương
21 tháng 2 2017

Cho tam giác ABC cân tại A vẽ BD vuông goác vơia AC tại D, CE vuông góc với AB tại E . Gọi H là giao điểm của BD và CE . Cmr     

a,AH vuông góc BC

b, AD =CE , BD = AE

c, MB mũ 2 + MC mũ 2 = 2 MA mũ 2

b, góc 
#Toán lớp 7
0
HT
Hoàng Trang
20 tháng 7 2015

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
#Toán lớp 7
12
CL
Cao Linh Chi
13 tháng 2 2016

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Đúng(0)
CV
CUTE vô đối
7 tháng 3 2017

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Đúng(0)
YH
Y Hoa Nhược Yến
22 tháng 1 2017

Cho tam giác ABC vuông cân tại A. H là trung điểm của BC. M là điểm nằm giữa B và H. Vẽ MD \(⊥\)AB tại D, vẽ ME \(⊥\)AC tại E. CMR:

a) AH \(⊥\)BC

b) AD=CE ; BD=AE

c) MB2+MC2=2MA2 

Bạn nào giúp mình nhanh mình tick cho nhé
#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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