Пошаговое объяснение:

1) = 1/ 1/5 = 1•5=5

2) = 1/ 5/4 = 1•4/5 = 4/5

3) = 1/ 5/6 = 1• 6/5 = 6/5= 1 целая 1/5 (1 1/5)

4) = 1/ (41/9-29/9) = 1/ 12/9 = 1• 9/12 = 9/12 = 3/4