-2/5: 1/3
7/15 : -7/30
-6 : 6/7
6:8
-16/21 : (-8)
- 5/12:(-3/10)
1 1/4 : 2 1/2

Пошаговое объяснение:

-2/5 : 1/3 = -2/5 * 3/1 = -6/5 = -1 1/5

7/15 : (-7/30) = 7/15 * (-30/7) = 1/1 * (-2/1) = -2/1 = -2

-6 : 6/7 = -6 * 7/6 = -42/6 = -7

6 : 8 = 6/8 = 3/4

-16/21 : (-8) = 16/21 * 1/8 = 2/21 * 1/1 = 2/21

-5/12 : (-3/10) = -5/12 * (-10/3) = 50/36 = 25/18 = 1 7/18

1 1/4 : 2 1/2 = 5/4 : 5/2 = 5/4 * 2/5 = 10/20 = 1/2