Răspuns:
x=9/24+13/24+15/72
x=22/24+15/72=amplificam prima fractie cu 3
x=66/72+15/72=81/72=se simplifica si numitorul si numaratorul cu 9
x=9/8
y=23/40+49/40+6/80
y=72/40+6/80 amplificam prima fractie cu 2
y=144/80+6/80
y=150/80=15/8
x+y=9/8+15/8
x+y=24/8 se simplifica fracta cu 8
x+y=3