Решите уровнения 0,4x=0,4-2(x+2) 0,2-2(x+1)=0,4x 4x-5,5=5x-3(2x-1,5) 4-5(3x+2,5)=3x+9,5 5(2+1,5x)-0,5x=24 3(0,5x-4)+8,5x=18

1) 0,4x = 0,4 - 2 (x + 2),

0,4х = 0,4 - 2х - 4,

0,4х + 2х = 0,4 - 4,

x (2 + 0.4) = - 3.6.

2.4x = - 3.6.

x = - 3.6 : 2,4 = - 1,5,

Ответ: х = - 1,5.

2) 0,2 - 2 (x + 1) = 0,4x.

0.2 - 2x - 2 = 0.4x.

0.4x + 2x = 0.2 - 2.

x (2 + 0.4) = - 1.8.

2.4x = - 1.8.

x = - 1.8 : 2,4 = - 0,75,

Ответ: х = - 0,75.

3) 4x - 5,5 = 5x - 3 (2x - 1,5).

4x - 5.5 = 5x - 6x + 3 * 1.5.

4x - 5x + 6x = 4.5 + 5.5.

x (4 - 5 + 6) = 10.

5x = 10.

x = 10 : 5 = 2,

Ответ: х = 2.

4) 4 - 5 (3x + 2,5) = 3x + 9,5.

4 - 5 * 3x - 5 * 2.5 - 3x = 9.5.

4 - 15x - 12.5 - 3x = 9.5.

- x (15 + 3) = 9.5 - 4 + 12.5.

- 18x = 18.

x = - 18/18 = - 1.

Ответ: х = - 1,

5) 5 (2 + 1,5x) - 0,5x = 24,

10 + 5 * 1,5х - 0,5х = 24,

7,5x - 0.5x = 24 - 10.

x (7.5 - 0.5) = 14.

7x = 14.

x = 14 : 7 = 2,

Ответ: х = 2.

6) 3 (0,5x - 4) + 8,5x = 18.

3 * 0.5x - 12 + 8.5x = 18.

1.5x + 8.5x = 18 + 12.

10x = 30.

x = 30 : 10 = 3,

Ответ: х = 3.