sa se calculeze x*y:
x=
[tex] \frac{8}{5} \times \frac{12}{7} \times \frac{16}{9} \times ... \times \frac{36}{19} [/tex]
y=
[tex] \frac{10}{6} \times \frac{14}{8} \times \frac{18}{10} \times ... \times \frac{38}{20} [/tex]