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URGENTT, AJUTOR
Calculează,apoi fa proba prin operatia inversa
10+8
11-1
7+10
12-10
10+9
14-4
18-10
5+10


Răspuns :

10+8=18 18-8=10

11-1=10 10+1=11

7+10=17 17-10=7

12-10=2 2+10=12

10+9=19 19-9=10

14-4=10 10+4=14

18-10=8 8+10=18

5+10=15 15-10=5