Question

Fie x apartine multimii numerelor intregi (Z).
Aflati numarul x astfel incat 23 supra 3x+2 apartine multimii numerelor intregi (Z).
Dau coronita!!!!!

Answer 1

23/3x+2
3x+2 apartine D23
D23=+-1,+-23

3x+2=1⇒3x=-1⇒x=-1/3
3x+2=-1⇒3x=-3⇒x=-1
3x+2=23⇒3x=21⇒x=7
3x+2=-23⇒3x=-25⇒x=-25/3

x=-1/3;-1;7;-25/3