Verified answer

1)

5/16 + x = 9/16 |*16

5 + 16x = 9

16x = 9 - 5

16x = 4

x = 4/16

x = 1/4

x = 0,25

Ответ: 0,25

2)

(17/28 - x) - 11/28 = 3/28

17/28 - x = 3/28 + 11/28

17/28 - x = 14/28

x = 17/28 - 14/28

x = 3/28

Ответ: 3/28

3)

x/25 - 4/25 = 13/25 |*25

x - 4 = 13

x = 13 + 4

x = 17

Ответ: 17