1.(6 2/9 -5 5/6):(-7/36)
2.7х -5(2х+1)=5х+15
3. А)2(6х+5)-2х
Б)6х-2(5-3х)​

Пошаговое объяснение:

1.

1) 6. 2/9 - 5. 5/6 =

6. 4/18 - 5. 15/18 =

5. 22/18 - 5. 15/18 = 7/18

2) 7/18 : (-7/36) = 7/18 * (-36/7) = -36/18 = -2

2.

7х - 10х - 5 = 5х + 15

7х - 10х - 5х = 15 + 5

-8х = 20

х = 20 : (-8)

х = -20/8

х = -2. 4/8

х = -2. 1/2

3.

А)

12х + 10 - 2х = 10х + 10

Б)

6х - 10 + 6х = 12х - 10