tong cua tu so va mau so cua mot phan so la 4812 sau khi rut gon phan so do ta duoc phan so 5/7 hay tim phan so chua rut gon

cho phân số c/d. neu rut gon phan so c/d thi duoc phan so 2/5. neu giam tu so di 12 đv roi rut gon thi duoc phan so 4/25. tim phan so c/d.

cho phan so a/b . Neu rut gon phan so a/b thi ta duoc phan so 3/4 . Neu cong them 15 don vi vao tu so roi rut gon thi duoc phan so 7/6. Tim phan so a/b

Theo phan so c/d . Neu rut gon c/d phan so thi duoc phan so 6/7 . Neu gam tu so di 12 don vi roi rut gon thi duoc phan so 36/49 . Tim phan so c/d da cho .

rut gon phan so sau roi quy dong

a    -15/90; 120/600; -75/150

b     54/-90;-180/288;60/-135

\(\frac{\left(-5\right)^3.40.4^3}{135.\left(-2\right)^{14}.\left(-100\right)^0}\)

Giup minh rut gon phan so nhe

tìm phân số biết tong cua tu va mau la 25 va khi rut gon thi duoc phan so -2/3

hieu vua mau va tu la 140 va khi rut gon phan so do thi duoc phan so 2/3

Cho cac phan so 5 / 7, 6 / 9 , 12 / 24 , 23 / 24 va 6 / 14

a Tim phan so toi gian

b Phan so nao rut gon duoc . Hay rut gon 

ai nhanh nhat minh TICK cho

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.