Ответ:

3 3/16

Пошаговое объяснение:

1) 1,6 - 1 14/15 = 1 6/10 - 1 14/15 = 1 18/30 - 1 28/30 = -10/30 = -1/3

2) -1/3 * 6/7 = -1/1 * 2/7 = -2/7

3) -2/7 : 1 11/21 = -2/7 : 32/21 = -2/7 * 21/32 = -1/1 * 3/16 = -3/16

4) 3 - (-3/16) = 3 + 3/16 = 3 3/16