Решите уравнение: 1) 0,4 (x-3) - 1.6=5 (0.1x-0.5) 2) 1.5 (2x-5) + 2x=5 (0.5x-1.5) - 10 3) 2/3 (1 1/2x+3/5) - 4/5 (5/12x-1/2) = 1 3/5

Найдем корни.

1) 0,4 * (x - 3) - 1.6 = 5 * (0.1 * x - 0.5);

0.4 * x - 1.2 - 1.6 = 0.5 * x - 2.5;

0.4 * x - 2.8 = 0.5 * x - 2.5;

0.4 * x - 0.5 * x = - 2.5 + 2.8;

-0.1 * x = 3;

-x = 30;

x = - 30.

2) 1.5 * (2 * x - 5) + 2 * x = 5 * (0.5 * x - 1.5) - 10;

3 * x - 7.5 + 2 * x = 2.5 * x - 7.5 - 10;

5 * x = - 10;

x = - 10/5;

x = - 2.

3) 2/3 * (1 1/2 * x + 3/5) - 4/5 * (5/12 * x - 1/2) = 1 3/5;

2/3 * (3/2 * x + 3/5) - 4/5 * (5/12 * x - 1/2) = 8/3;

x + 2/5 - 4/12 * x + 2/5 = 8/3;

x - 1/3 * x + 4/5 = 8/3;

2/3 * x = 8/3 - 4/5;

1/3 * x = 4/3 - 1/5;

1/3 * x = 20/15 - 3/15;

1/3 * x = 17/15;

x = 17/5.