49 / 27 co rut gon dc ko
49 / 84 co rut gon dc ko =
cho p/s a/b. co a+ b = 136 .rut gon a/b ta duoc p/s 3/5.tim a/b
mot phan so co hieu cua mau so va tu so la 15, khi rut gon phan so do duoc 7/10.Tim phan so do
56 / 16 rut gon duoc may
Rut gon phan so 38/57
Rut gon phan so 195/221,duoc toi gian la
rut gon phan so 272727/727272 de duoc phan so toi gian
cho phân số 37/63 hay tim mot so sao cho lấy lay so do cung them vao ca tu so va mau so ta duoc phan so moi sau khi rut gon co ti so la 2/3