А) 4 2/4 1 2/7 = (4 + 2/4) (1 + 2/7) = 18 4/28 = 18 1/7
Б) 5/8 * 4/5 = 20/40 = 1/2
В) 9/25 2 1/7 1 5/9 = (9/25) (15/7) (14/9) = 1890/3150 = 2/3
А) 4 2/4 1 2/7 = (4 + 2/4) (1 + 2/7) = 18 4/28 = 18 1/7
Б) 5/8 * 4/5 = 20/40 = 1/2
В) 9/25 2 1/7 1 5/9 = (9/25) (15/7) (14/9) = 1890/3150 = 2/3