решите уравнения: 1) х/4+х/3=х/6+5 ; 2) 2х/3-4х/5=х/15+1; 3) 3х/8 - х/6=х/12-1

Ответ:

Пошаговое разъясненье:

1)

х/4 + х/3 = х/6 + 5;  * 12

3x + 4x = 2x + 60

7x = 2x + 60

7x - 2x = 60

5x = 60

x = 60 : 5

x = 12

2)

2х/3 - 4х/5 = х/15 + 1;  *15

10x - 12x = x + 15

-2x = x + 15

-2x - x = 15

-3x = 15

x = 15 : (-3)

x = -5

3)

3х/8 - х/6 = х/12 - 1;  *24

9x - 4x = 2x - 24

5x = 2x - 24

5x - 2x = -24

3x = -24

x = -24 : 3

x = -8