49 / 27 co rut gon dc ko
49 / 84 co rut gon dc ko =
38 / 48 CO RUT GON DUOC KO
tim x
2/9 * x= 6/11
ko can rut gon
cho p/s a/b. co a+ b = 136 .rut gon a/b ta duoc p/s 3/5.tim a/b
Cho phan so tong cua tu so va mau so la 136 . Tim phan so do biet phan so do co the rut gon 3/11
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
TINH ROI RUT GON
Hay rut gon cac phan so sau :
9 phan 6 ; 12 phan 4 va 90 phan 70
Cac ban hay rut gon va doc giong nhu minh nhe.
56 / 16 rut gon duoc may