Răspuns:
a) 2/3+1/2=
numitorul comun 6
4+3/6=7/6
b) 2-1/3-(1/2-3/8)
=2-1/3-(4-3/8)
=2-1/3-1/8
=48-8-3/24=37/24
c) 7/3×9/14=63/42
d)7/9:7/3=7/9×3/7=21/63
