Răspuns:
3) 3/2 + 2/2=5/2
10/8 + 10/8
5/4 + 5/4
20/16 + 20/16
5/12 + 5/12
4)5/3 - 1/3
60/30 - 20/30
40/9 - 20/9
16/6 - 8/6
20/12 - 4/12
5) x + 3/99=14/99 + 25/99= 38/99
x=38/99 - 3/99
x=35/99
