Răspuns:
13.948.731.927:39= 357.659.793
a=(3²¹+3²⁰+3¹³)/39
a=(3⁸+3⁷+1)x3¹³:39
a=(6561+2187+1)x3¹³:39
a=8749x3¹³:39
a=(8794x3¹³)/89
a=(673x3¹³)/3
a=673x3¹²
sau =357.679.793
