Question

[Pham thi diem quynh]

cho tam jac ABC , goc A =60 do . tia p/g cua goc B cat AC o D . tia p/g cua goc C cat AB o E . cac tia p/g do cat nhau o I . cm rag 

ID = IE 

cac p oi mk can cau tl nhanh nha