Bonjour;

a)

35/10+3/0 = 38/10 ( = 19/5)

b)

30/36-5/36 = 25/36

c)

3/7 +42/7 = 45/7

d)

48/55 -11/55 = 37/55

e)

180/20-17/20 =163/20

f)

15/56 +72/56= 87/56