Problema 4 cu rezolvare va rog frumos repede DAU COROANA

408:[2*9+2^20:(2^3)^6+1+(3^3)^13:3^39]
408:[18+2^20:2^18+1+3^39:3^39]
408:[19+2^2+1]
408:[20+4]=408:24=17