Răspuns:
Explicație pas cu pas:
[tex]\displaystyle f \ = \ \frac{5}{9} \ \cdot \ \frac{2 \ \cdot \ 5 \ + \ 2}{5} \ + \ \frac{2 \ \cdot \ 3 \ + \ 1}{3} \ = \ \ \frac{5}{9} \ \cdot \ \frac{12}{5} \ + \ \frac{ 7 }{3} \ = \ \frac{4}{3 } \ + \ \frac{ 7 }{3} \ = \frac{ 11 }{3} \ = \ 3\frac{2}{3} [/tex]
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