de xreiazetai na kaneis fronthsthrio nefelh gia thn oikonometria...fronthse na parakolou8hseis ta ma8hmata kai ta fronthsthriaka.o karaganhs oso k an sou fainetai periergo einai diate8hmenos na boh8hsei kai sto lew ek peiras auto.edwsa fetos oikonometria gia prwth fora k perasa me 10.