daca a+b= 999, iar a-b= 1, afla ce valoare are a . dar b

Răspuns :

a + b = 999

a - b = 1

Adunam relatiile

a + b + a - b = 999 + 1

2a = 1000

a = 500

b = 499

999-1=998
998:2=499-b
499+1=500-a


500+499=999
500-499=1