Решите уравнения: 2×/36=5/6;4/9=3×/54;7/21=3×/54;11/33=2/3×;8/5=4×/15;9/16=3×/64

2х/36=5/6

2х=5/6*36

2х=30

х=30/2

х=15

Проверка: 2*15/36=5/6    5/6=5/6

Ответ: х=15

4/9=3 х/54

3 х *9=4*54

27 х=216

х =8

7/21=3x/54

1/3=x/18

3x=18

x=6