1. Determinati numerele intregi x ,y care satisfac relatia x²=120-7x³y.
2. Rezolvati in Z·Z ecuatia 2xy-3x-4y+9=0.
3. Rezolvati in multimea numerelor intregi ecuatia x²y+2x³=63.
4. Rezolvati in Z ecuatia x²-2x-143=0.
5. Rezolvati in Z ecuatia xy-3x+2y=1.
6. Determinati perechile de numere intrgi [x,y] pentru care xy+y-3x=-5.
etc.