ajutor! va rog!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

a)3/4+5/4=8/4=2
b)2/7+1/7+3/7=6/7
c)1/42+5/42+6/42=12/42=2/7
d)9/100+1/100+90/100=100/100=1