Question

care este produsul a ori b ori c,stiind ca :
a+b= 21
b+c=5
a+c=22

Answer 1

a=21-b
c=5-b
a+c=22=.21-b+5-b=22=>26-2b=22=>26-22=2b=>4=2b=>b=2
c=5-2=>c=3;
a=21-2=>a=19