помогите с математикой!
1) 7х-3/(дробь) 16=2/4
2) 5х-2х/9=16/4

Ответ:

1.   х = 11/112

2.  х = 36/43

Пошаговое объяснение:

1) 7х - 3/16 = 2/4  = 1/2

7х = 3/16 + 2/4

7х = 11/16

х = 11/16 : 7

х = 11/112

Проверка:

7 * 11/112 - 3/16 = 1/2

77/112 - 3/16 = 1/2

56/112 = 1/2

1/2 = 1/2

2) 5х - 2х/9 = 16/4 = 4

4 7/9х = 4

х = 4 : 43/9

х = 4 * 9 : 43

х = 36/43

Проверка:

5 * 36/43 - 2 * 36/43 : 9 = 4

180/43 - 72/43 : 9 = 4

180/43 - 8/43 = 4

172/43 = 4

4 = 4