Răspuns:
1) 10/15+7/15= 17/15
2) 3/4+9/4= 12/4 = 3 ( simplificat prin 4)
3) 2/3+1/3= 3/3= 1 ( simplificat prin 3)
4) 10/11-4/11= 6/11
5) 10/3+7/3-1/3=17/3- 1/3= 16/3
6) 21/30+9/30= 30/30= 1 ( simplificat prin 30)
7) 25/15-15/15= 10/15= 2/3 ( simplificat prin 5)
8) 1- 1/10= ( numitor comun 10 )
10 /10-1/10= 9/10
9) 2- 4/3 = 2/1- 4/3= ( numitor comun 3)
6/3-4/3= 2/3
10) 7/8+1/4= ( numitor comun 8)
7/8 + 2/8= ( amplificam cu 2 a doua fractie)=
9/8
11) 3/2+6/3= ( numitor comun 6)
9/ 6 + 12/ 6 = 21/6
