Question

Daca a+b=999,iar a-b=1,afla ce valoare are a.Dar b?

Answer 1

Daca a-b=1,atunci a=b+1
Si in ecuatia a+b=999 il scrii pe 'a' drept b+1 si va rezulta 2b+1=999, deci b=499
Si cum a=b+1, atunci a=500

Answer 2

 a=999-1        a=998       998+1=999                                                                                                            b=998+1                                                                                                                b=999-998=1