1) 1/2(2-х)+3/4(х-1)=1/12 2) 5(2х+3)-3(4-х)=3 3) 3 1/2(3х+1)=1/2(1-3х) ,до 21; 00

Пошаговое объяснение:

Пошаговое объяснение:

1)

1/2(2-х)+3/4(х-1)=1/12  

1 - 1/2x + 3/4x - 3/4 = 1/12

1/4 - 2/4x + 3/4x = 1/12

1/4 + 1/4x = 1/12

1/4x = 1/12 - 1/4

1/4x = 1/12 - 3/12

1/4x = -1/6

x = -1/6 * 4

x = -4/6

x = -2/3

2)

5(2х+3)-3(4-х)=3

10x + 15 - 12 + 3x = 3

13x + 3 = 3

13x = 3 - 3

13x = 0

x = 0

3)

3 1/2(3х+1)=1/2(1-3х)

7/2(3x + 1) = 1/2 - 3/2x

21/2x + 7/2 = 1/2 - 3/2x

21/2x + 3/2x = 1/2 - 7/2

24/2x = -6/2

12x = -3

x = -3 : 12

x = -1/4