Question

Помогите пожалуйста!!!!!!!!​

Answer 1

Решение:

1) 2,5(4-2x)-5(1-3x) = 5

10-5x-5+15x = 5

10x = 5-5

10x = 0

x = 0/10

x = 0

2) 2/3(3x-1)-1/9(9x-2 1/4) = 1/4

2x-2/3-x+(1/9•9/4) = 1/4

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

x = 2/3

3) -(x-5)-1,2(5-4x) = 2,8

-x+5-6+4,8x = 2,8

3,8x-1 = 2,8

3,8x = 2,8+1

3,8x = 3,8

x = 3,8/3,8

x = 1

4) -1 1/3(x-3) - 2/3(x+1,5) = 5

-4/3x+(4/3•3) -2/3x-2/3•3/2 = 5

-4/3x+4-2/3x-1 = 5

-6/3x+3 = 5

-2x = 5-3

-2x = 2

x = -2/2

x = -1

Ответ: 1) 0; 2) 2/3; 3) 1; 4) -1;