Răspuns :
rad 5/ rad 2 - rad 2/ rad 5 - 1 =
rad10/2-rad10/5-1=
5rad10-2rad10 totul /10 - 1=
3rad10/10-1=
(3rad10-10)/10
rad10/2-rad10/5-1=
5rad10-2rad10 totul /10 - 1=
3rad10/10-1=
(3rad10-10)/10