Show:
restas de fracciones
suma de fracciones
100

9/2 - 19/7 = 

15/14


100

5/2+ 19/7=

83/14

200

7/3 - 4/5 =

23/15

200

17/3+ 1/7=

122/21

300

13/5- 5/3=

14/15

300

5/6+ 8/3= 

63/18

400

23/9 - 4/3 =

33/27

400

1/5 + 2/4 

14/20

500

15/4 - 1/5 =

71/20

500

2/7+ 2/8=

30/48