Cho tam giac ABC (AB>AC).M la trung diem cua BC.Duong thang qua M va vuong goc voi tia phan giac cua goc A tai H cat AB,AC lan luot tai E,F

a,CM H la trung diem EF va EF^2/4+AH^2=AE^2=AF^2

b,CM goc ACB=2*goc BME+ goc ABC

c, CM BE=CF

help me

cho tam giac abc co ab> ac goi m la trung diem cua bc .Tu M ke duong thang vuong goc voi phan giac cua goc a cat tia phan giac tai H cat AB va AC lan luot tai E va F .CMR a,BE=CF;b,AE=AB+AC/2 VA BE=AB-AC/2

cho tam giac abc (ab>ac), m la trung diem cua bc. Duong thang vuong goc voi tia phan giac cua goc a tai h cat ab, ac lan luot tai e va f.cmr: a)eh=hf

b)2 goc bme= goc acb - goc b

c)fe^2/4+ah^2=ae^2

d)be=cf

(de bai co sai cac ban sua gium nha)

tam giac ABC co ab>ac tu trung diem M cua BC ve mot duong thang vuong goc voitia phan giac cua gocA cat tia phan giac tai H cat AB,AC lan luot tai E va F chung minh 

a) BE=CF

b) ae=ab+ac/2

be=ac-ac/2

c) goc bme=acb-b/2

cho tam giac abc , ab > ac tu trung diem m cua bc ve 1 duong thang vuong goc voi phan giac cua goc a tai h cat ab ac lan luot la e va f

cm be=cf

Cho tam giac ( AB>AC) ,M la trung diem BC. Duong thang di qua M va vuong goc voi tia phan giac cua goc A tai H cat hai tia AB, AC lan luot tai E va F.Chung minh rang :

a) EF^2/4+AH^2=AE^2

b) 2gocBME=gocACB-goc B

c) BE=CF

Cho tam giac ABC(AB>AC).M la trung  diem cua BC .Duong thang di qua M vuong goc voi tai phan giac cua goc A  va cat AB,AC tai Eva F .CM BE =CF

Cho tam giac ABC co AB>AC.M la trung diem cua BC,ke duong thang vuong goc vs tia phan giac cua goc A tu M.Cat nhau tai H va cat AB tai E,AC tai F.CMR

a)BE=CF

b)AE=(AB+AC)/2

BE=(AB-AC)/2

c)goc BME=(goc ACB- goc B)/2