exercitiu

[Karla_79]

Care sunt nunerele naturale ab care verifica egalitatea ab+bc=45?

[sifu22]

ab+bc=45
b(a+c)=45
b=1; a+c=45 rezulta a apartine mult. (0,1,2,3,4...45) si b apart. mult.(45,44,43,42...0)
b=3; a+c=15 rezulta a=(0,1,2,3...15); b=(15,14,13,12...0)
b=5; a+c=9 rez. a=(0,1,2,...9); b=(9,8,7...0)
b=9; a+c=5 rez. a=(0,1,2,3,4,5); b=(5,4,3,2,1,0)
b=15; a+c=3 rez. a=(0,1,2,3); b=(3,2,1,0)