Question

daca a+b=641,b+c=685,a+c=506,atunci a+b+c=?

Answer 1

dacă adunăm toate relațiile

a+b+b+c+a+c=641+685+506
2a+2b+2c=1832
a+b+c=1832:2
a+b+c=916

Answer 2

a+b=641,b+c=685,a+c=506,atunci a+b+c=?
(a+b)+(b+c)+(a+c)=641+685+506
2xa+2xb+2xc=1832
2x(a+b+c)=1832
a+b+c=1832:2
a+b+c=916