Пошаговое объяснение:

5/14+17/42-1 6/8=83/84

-5 8/9:1 17/36+11/4-5/21=-2 83/84

Пошаговое объяснение:

№1

1) 5/14 + 17/42 = 15/42 + 17/42 = 32/42 = 16/21

2) 16/21 - 1. 6/8 = 16/21 - 1. 3/4 = 64/84 - 1. 63/84 = 64/84 - 147/84 = 83/84

№2

1) -5. 8/9 : 1. 17/36 = -53/9 : 53/16 = -53/9 * 16/53 = -16/9 = -1. 7/9

2) -1. 7/9 + 1. 1/4 = -1. 28/36 + 1. 9/36 = -19/36

3) -19/36 - 5/21 = -133/252 - 60/252 = -193/252