V
viethoang345


cho tam giac ABC co M la trung diem BC. Ve cac diem F,E,G sao cho B,M,C theo thu tu la la trung diem cac doan thang AF,AE,AG
a,CMR AB song song voi CE
b,CMR ba diem FEG thang hang
a,CMR AB song song voi CE
b,CMR ba diem FEG thang hang