a) 7/9(amplificam cu 5)=35/45
5/3(amplificam cu5)=25/15
11/15(amplificam cu 5)=55/75
b)7/9(amplificam cu3 )=21/27
5/3(amplificam cu3 )=15/9
11/15(amplificam cu3 )=33/45
c)7/9(amplificam cu10 )=70/90
5/3(amplificam cu10 )=50/30
11/15(amplificam cu10 )=110/150
d)7/9(amplificam cu8 )=56/72
5/3(amplificam cu8 )=40/24
11/15(amplificam cu8 )=88/120