12. Determinați produsele
a) 3/5*10/9*15/2;
b) (poza))
c) (poza)
d) (poza)

Răspuns:
a) 2/3×15/2= 5
b)7/2×4/7×1/4= 28/14×1/4= 2×1/4= 2/4=1/2
c)7/3×6/7×3/2= 2×3/2= 6/2=3
d)5/6×19/5×30/19=19/6× 30/19= 5.