Răspuns :
[tex]
\frac{a+b+c}{3} = 0,5 = \ \textgreater \ a + b + c = 3 * 0,5 = \ \textgreater \ \boxed{a + b + c = 1,5}[/tex]
\frac{a+b+c}{3} = 0,5 = \ \textgreater \ a + b + c = 3 * 0,5 = \ \textgreater \ \boxed{a + b + c = 1,5}[/tex]