Пошаговое объяснение:

А) 4/5 * 6/4 = 1/5 * 6/1 = 6/5 = 1 1/5

В) 3/8 * 6/16 = 3/4 * 3/16 = 9/64

С) 8/6 * 14/9 = 8/3 * 7/9 = 56/27 = 2 2/27

D) 10/9 * 15/12 = 5/3 * 5/6 = 25/18 = 1 7/18

E) 5/4 * 30/16 = 5/2 * 15/16 = 75/32 = 2 11/32