Ответ:

Пошаговое объяснение:

7 : 8 = x : 96

8 * x = 7 * 96

8x = 672

x = 672 : 8

x = 84

============

y : 1 5/31 = 7 3/4 : 1/3

1/3 * y = 7 3/4 * 1 5/31

1/3 * y = 31/4 * 36/31

1/3 * y = 9

y = 9 * 3

y = 27

=============

a/0,6 = 25/3

3a = 25 * 0,6

3a = 15

a = 15:3

a = 5

============

(2 + x)/5 = 4/9

9*(2 + x) = 5 * 4

18 + 9x = 20

9x = 20 - 18

9x = 2

x = 2:9

x = 2/9