2. a) 2/4,5/6,4/5,3²/50:5,5²/2⁵,3²²/2³³,8⁴/2¹³.
b) 6/6,2³/8,4²/2⁴.
c) 6/5,7/3,7³⁴/7³².
3. 5/4 amplificat cu 7=35/28
12/7 amplificat cu 7=84/49
75/19 amplificat cu 7=525/133
7³/7⁵=343/16807 amplificat cu 7=2401/117649
8/8 amplificat cu 7=56/56
4. 6/12 simplificat cu 6=1/2
18/12 simplificat cu 6=3/2
48/24 simplificat cu 24=2/1
6/12 simplificat cu 6=1/2
18/27 simplificat cu 9=2/3
45/25 simplificat cu 5=9/5
42/49 simplificat cu 7=6/7
240/18 simplificat cu 6=40/3
100/75 simplificat 25=4/3
360/420 simplificat cu 60=6/7
5. a) 4/5=8/10
4×10=5×8=40(A)
b) 2/4=9/18
2×18=4×9=36(A(
c) 2/3=4/5
2×5≠3×4(F)
d) 4/5=8/10
10×4=8×5=40(A)
e) 3/6=5/9
3×9≠6×5(F)
