Решите уравнения 1)5/14+x=9/14 2)(28/31+x)-14/31=16/31 3)x/36-5/36=7/36

1) 5/14 + x=9/14;

х = 9/14 - 5/14 = (9 - 5)/14 = 4/14;

х = 4/14;

Проверка.

5/14 + 4/14 = 9/14;

9/14 = 9/14; 

2) (28/31 + x) - 14/31 = 16/31;

28/31 + х - 14/31 = 16/31;

х = 16/31 - 28/31 + 14/31 = (16 - 28 + 14)/31 = 2/31;

х = 2/31;

Проверка.

(28/31 + 2/31) - 14/31 = 16/31;

30/31 - 14/31 = 16/31;

16/31 = 16/31;

3) x/36 - 5/36 = 7/36;

х/36 = 7 /36 + 5/36 = 12/36;

х/36 = 12/36;

х = 12/36 / 1/36 = 12/36 * 36/1 = 12;

Проверка.

12/36 - 5/36 = 7/36;

7/36 = 7/36;