PGCD=a(57;84)   b.PGCD=(120;48)


Sagot :

84 = 1 x 57 + 27
57 = 2 x 27 + 3
27 = 3 x 9 + 0 

pgcd (57 ; 84) = 3

120 = 2 x 48 + 24
48 = 2 x 24 + 0

pgcd (120 ; 48) = 24