12 = 2 la puterea 2 × 3}C.M.M.D.C (12;40) =2 la puterea 2=4
40 = 2 la puterea 3 × 5}
40:12= 3+4
12:4= 3+0
(12;40) = 2 la puterea 2 = 4
C.M.M.M.C
12 = 22 × 3;
40 = 23 × 5;
(12; 40) = 23 × 3 × 5 = 120
40 : 12 = 3 + 4
12:40= 3+0
R:(12; 40) = 120 = 23 × 3 × 5