x | 180
4207:x = C rest 7
4207 = x · C + 7 | -7
4200 = x · C => x | 4200
D₁₈₀={1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180}
D₄₂₀₀={1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 25, 28, 30, 35, 40, 42, 50, 56, 60, 70, 75, 84, 100, 105, 120, 140, 150, 168, 175, 210 ...... }
x este divizor comun al lui 180 si 4200 mai mare decat 7.
x €(apartine) {10, 12, 15, 20, 30, 60}
P.S: sunt Alex colegul.
Sper ca te-am ajutat!
