а) 10/30 9/9 = (109) / (30*9) = 90/270 = 1/3
б) 12/14 14/16 16/18 = (6/7) (7/8) (8/9) = 6/9 = 2/3
в) 14/21 15/20 = (2/3) (3/4) = 6/12 = 1/2
а) 10/30 9/9 = (109) / (30*9) = 90/270 = 1/3
б) 12/14 14/16 16/18 = (6/7) (7/8) (8/9) = 6/9 = 2/3
в) 14/21 15/20 = (2/3) (3/4) = 6/12 = 1/2