Ajutati-ma va rog la ex.



1. 1+5/13-6/13=6/13+6/13= 12/13
2.73/5-68/5-5/5= 5/5
3. amplificam 3/4 cu 2=6/8
6/8+1/8=7/8
8/8-7/8=1/8
R:1/8