108/234 ;2/1= 108/234 nhan 2/1 dao nguoc la:108/234 nhan 1/2vua dao nguoc xong=108/468 rut gon cho 4=54/234 van chua ve phan so toi gian thi rut tiep cho 2,roi rut cho3 hai lan thi se bang 3/13
co dung khong
ua vay la nham voi de roi cu tuong lay 108/234 chia so nao do roi moi rut gon cho