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 \(⊥\)BCb) AD=CE

YH

Y Hoa Nhược Yến

22 tháng 1 2017 - olm

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

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

#Toán lớp 7

0

NM

nguyễn mai bằng lòng

19 tháng 2 2018 - olm

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

YH

Y Hoa Nhược Yến

22 tháng 1 2017 - olm

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

TT

Thanhhoa Tran

25 tháng 2 2017 - olm

Cho tam giac ABC vuông cân tại A, H là trung điểm cạnh BC, M là điểm nằm giữa B và H. Vẽ MD vuông góc với AB tại D.Vẽ ME vuông góc AC tại E. Cmr:

a) AH vuông góc BC

b) AD = CE, BD = AE

c) \(^{MB^2}^{=MC^2=2MA^2}\)

#Toán lớp 7

0

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

#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

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Đúng(0)

LH

Lê Huỳnh

1 tháng 5 2016 - olm

Cho tam giác ABC đều có đường cao AH=h. M là điểm nằm trong tam giác ABC, vẽ MD vuông góc AB tại D , ME vuông góc BC tại E và MF vuông góc AC tại F.

a/ CMR MD+ME+MF=h

b/ xác định vị trí của điểm M trong trường hợp MD=ME=MF

#Toán lớp 9

0