Verified answer

Ответ:

Пошаговое объяснение:

№1

2 2/3х = 4 16/21

х = 4 16/21 : 2 2/3

х = 100/21 : 8/3

х= 100/21 * 3/8

х = 1 11/14

№2

1/4х + 1/6х + 1/8х = 39/56

6/24х + 4/24х + 3/24х = 39/56

13/24х = 39/56

х = 39/56 : 13/24

х= 39/56 * 24/13

х= 1 2/7

№3

4 2/15 - (3 1/9х) = 1 4/5

3 1/9х = 4 2/15 - 1 4/5

3 1/9х = 4 2/15 - 1 12/15

3 1/9х = 3 17/15 - 1 12/15

3 1/9х = 2 1/3

х = 2 1/3 : 3 1/9

х= 7/3 : 28/9

х = 7/3 * 9/28

х= 3/4