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a+b=22
a-b=12
Determina cele doua numere


Răspuns :

a + b = 22

a - b = 12

a = 12 + b

12 + b + b = 22

12 + 2 × b = 22

2 × b = 22 - 12

2 × b = 10

b = 10 : 2

b = 5

a = 12 + 5

a = 17