x = 24a + 11 x = 12·2a +11
y = 36b + 22 y = 12·3b + 22
a) x : 12 = 2a r = 11 y : 12 = 3b r = 22
b) 3x + 2y = 72a + 33 + 72b + 44 = 72 (a + b + 1) + 5
(3x + 2y) : 72 = a + b + 1 r = 5
c) 15x + 5y = 360a +165 + 180b + 110 = 360a + 180b + 275
Uc(360a) = 0 Uc(180b) = 0 Uc(275) = 5 ⇒Uc(15x + 5y) = 5