Explicație pas cu pas:
a. 7/12-3/12=(7-3)/12=4/12=1/3
b. 17/25-12/25=(17-12)/25=5/25=1/5
c. 45/76-27/76=
=(45-27)/76=18/76=9/38
d. 8/9-5/9=(8-5)/9=3/9=1/3
E. 3/2-1/2=(3-1)/2=2/2=1
f. 49/3-18/3=(49-18)/3=31/3
g. 40/7-19/7=(40-19)/7=21/7=3
H.47/20-15/20=
=(47-15)/20=32/20=8/5