Pls rpdddd dau coroanaaaa ❤️va roggg ex 12

Răspuns:
a= 2/4+3/4=5/4
b=4/6+1/6=5/6
c=2+2/4=8/4+2/4=10/4=5/2
d=1+3/5=5/5+3/5=8/5