/= supra, uneori impartire. In acest caz / inseamna supra
2) 3/18+5/18=3+5/18=8/18
5/9+3/9=5+3/9=8/9
6/15+8/15=6+8/15=14/15
3) 8/10+1/10=8+1/10=9/10
5/9+2/9=5+2/9
8/12+3/12=8+3/12=11/12
15/25+1/25=16/25
18/150+ 132/150=18+132/150=150/150
135/195+25/195=160/195
