va rog repede !!!!!!!

a) (624;780) = ?
descompunem numerele date in numere prime:
624 = [tex]2^{4}[/tex]*3*13
780 = [tex]2^{2}[/tex]*3*5*13
(624;780) = 4*3*13 = 156
b) (360;864) = 72
c) (630;648) = 18
d) (864;1680) = 48
e) (1568;252) = 28