Răspuns:
[tex]( \frac{2 - 4}{3} ) \times ( \frac{2}{3} ) {}^{2} = \frac{ - 2}{3} \times ( \frac{2}{3} ) {}^{2} - ( \frac{2}{3} ) {}^{3} = - \frac{8}{27} [/tex]
