[tex]a-b=12.2\\\\ \frac{a+b}{2}=34.2 \\ ********************\\ \\ \frac{a+b}{2}=34.2 \to \boxed{a+b=34.2*2} \\ \\ a+b=68.4 \\ a-b=12.2 \to \boxed{a=12.2+b} \ \text{inlocuim pe a in relatia de sus} \\ \\ 12.2+b+b=68.4\\12.2+2b=68.4\\2b=68.4-12.2\\2b=56.2\\ b=56.2:2\\ \bold{b=28.1}[/tex]
[tex]a-b=12.2\\a-28.1=12.2\\\bold{a=40.3}[/tex]
daca faci verificarea o sa dea bine ;)
