Question

determinati nr naturale a b c stiind ca a+b=84 b+c=64 a+c=34

Answer 1

Adunam toate cele trei relatii si obtinem
2a + 2b + 2c = 84 + 64 + 34
2a + 2b + 2c = 182
a + b + c = 91
Scadem relatia obtinuta cu a + b = 84 si obtinem:
c = 91 - 84
c = 7
b + 7 = 64 => b = 57
a + 57 = 84 => a = 17

Answer 2

a + b      = 84

     b + c = 64

a      + c  = 34

_______________

2 × a + 2 × b + 2 × c = 84 + 64 + 34

2 × ( a + b + c ) = 182

a + b + c = 182 : 2

a + b + c = 91 → suma celor trei numere

_______________________________

91 - 64 = 27 ( a ) → primul numar

84 - 27 = 57 ( b ) → al doilea numar

64 - 57 = 7 ( c ) → al treilea numar