Rút gọn các phân số sau

7/21

8/20

24/56

36/81

12/14

400/700

121/132

100780

114/90

84/108

`7/21 = (7:7)/(21:7) = 1/3`

`8/20 = (8:4)/(20:4) = 2/5`

`24/56 = (24:8)/(56:8) = 3/7`

`36/81 = (36:9)/(81:9) = 4/9`

`12/14 = (12:2)/(14:2) = 6/7`

`400/700 = (400:100)/(700:100) = 4/7`

`121/132 = (121:11)/(132:11) = 11/12`

`100/780 = (100:20)/(780:20) = 5/39`

`114/90 = (114:6)/(90:6) = 19/15`

`84/108 = (84:12)/(108:12) = 7/9`