Question

afla numerele a.b.c daca a+b=c a-b=c b+c =20

Answer 1

a + b = c 
a - b = c ⇒ a = b + c = 20 
b + c = 20

a + b + c = 20 + 20 = 40 → suma celor 3 numere
a + b = a - b = 20
dar a = 20 ⇒ b = 20 - 20 = 0
c = 20 - 0 = 20 
a = c = 20 
b = 0 

Verific:  20 + 0 = 20 - 0 = 20


Raspuns: 20 (a),  0 (b),  20 ( c)