Răspuns:
[tex]a = {2}^{2} + \frac{2}{3} + \frac{15}{9} \\ = 4 + \frac{21}{9} \\ = \frac{57}{9} [/tex]
[tex]b = \frac{1}{2} + \frac{5}{2} \\ = \frac{6}{2} \\ = 3[/tex]
[tex] \frac{a + b}{2} \\ = \frac{\frac{57}{9} + 3}{2} \\ = \frac{ \frac{64}{9} }{2} \\ = \frac{32}{9} [/tex]
