Question

numerele naturale x care verifica relatia (x+2)|(2x+7) sunt:

repede dau coroana

Answer 1

x+2 l 2x+7

x+2 l x+2 l×2

x+2 l 2x+7

x+2 l 2x +4

x+2 l 2x+7-2x-4 => x+2 l 3 => x+2 €{1,3} l-2

x€{-1,1}

x€N

deci x€{1}