Question

determinati multimea a= x € Z| 7/2x+3 € Z

Answer 1

$\frac{7}{2x + 3}$

numitorul il divide pe numarator,deci numitorul apartine divizorilor numarului 7

/-divide

€-apartine

2x+3/7=> 2x+3€D7 => 2x+3€{-1,1,7,-7} |-3 => 2x€{-4,-2,4,-10} |:2 =>

x€{-2,-1,2,-5}