Question

ajutoor cu ex2, azi am avut teză!!!!

Answer 1

8/3x+2€Z→
3x+2|8→
3x+2€{-8,-4,-2,-1,1,2,4,8}
3x€{-8-2,-4-2,-2-2,-1-2,1-2,2-2,4-2,8-2}
3x€{-10,-6,-4,-3,-1,0,2,6}
x€{-10:3,-6:3,-4:3,-3:3,-1:3,0:3,2:3,6:3}
Alegem de aici doar elementele care vor da ca rezultat un numar apartinand multimii numerelor intregi (rezultatul in care se impart multiplii de-ai lui 3 la 3)
x€{-2,-1,0,2}