a) (13+ 5 intregi si 1/4+ 2 intregi si 3/4) /3=(13+21/4+11/4)/3=(13+32/4)/3=
=(13+8)/3=21/3=7
b) (4,49 + 7 intregi si 1/20 + 5 intregi si 1/2)/3=
= (449/100 + 141/20 + 11/2)/3=
=[(449+141*5+11*50)/100]/3=1704/300=5,68
c) (32 intregi si 7/9+5 intregi si 5/9+ 15, (6))/3=
=[(295/9+50/9+(156-15)/9]/3=
=(345/9+141/9)/3=
=486/27=18
d) (0,015+ 3,475+ 2,11+ 12+ 74,5)/5=
= (3,49+14,11+74,5)/5=
=92,1/5=18,42
e) [7,(6)+ 0,(7)+ 81,(5)]/3=
=[(76-7)/9+7/9+(815-81)/9]/3=
=(69/9+7/9+734/9)/3=
=(810/9)/3=
=90/3=30