Verified answer

Пошаговое объяснение:

а)

3 * 1/4 * 1/3 = (3 * 1/3) * 1/4 = 3/3 * 1/4 = 1 * 1/4 = 1/4

б)

2/5 * 4 * 5/2 = (2/5 * 5/2) * 4 = 1 * 4 = 4

в)

1/3 * 2 * 6 = 1/3 * 12 = 12/3 = 4

г)

2/3 * 2/5 * 3/2 = (2/3 * 3/2) * 2/5 = 1 * 2/5 = 2/5