Efectuați: urgentttt plsss dau coroanaaaa

sper ca te am ajutat!
Explicație pas cu pas:
a)3/2+3/4=6/4
b)4/3+10/6=14/6
c)6/4+15/8=21/8
d)25/6+3/4=28/6
e)28/10+3/4=31/10
f)42/9+10/6=52/9