Aflati valoarea expresiei
[tex]2 \times \frac{2}{3} - \frac{3}{4} \times \frac{4}{9}b)3 \times \frac{1}{2} \times 2 - \frac{1}{3} c) \frac{2}{5} \times \frac{1}{2} - \frac{7}{25} \times \frac{5}{7} [/tex]
va rog dau coroana urgent