1 = prima metoda , 2 = a doua metoda
1. (49 + 63) : 7 = 112 : 7 = 16
2. 49 : 7 + 63 : 7 = 7 + 9 =16
1. (63-36):3=27 : 3 =9
2. 63 :3 - 36:3 = 21 - 12 = 9
1.98: 14 - 70 :14 = 7 - 5 = 2
2.(98-70) :14 = 2
1.(64+72):8 = 8 + 9 = 17
2.64:8 + 72 :8 = 8+ 9 =17
1.(63-27):9=36 : 9=4
2.63 :9 - 27:9 = 7- 3= 4