Решить уравнение 5x/4-x/2=3; 2x/3+5x/2=19

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

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

5 * x / 1 * 1 - x / 1 * 2 = 3 * 4;

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

5 * x - 2 * x = 12;

x * (5 - 2) = 12;

3 * x = 12;

x = 12 / 3;

x = 4;

Ответ: х = 4.

2) 2 * x / 3 + 5 * x / 2 = 19;

2 * x / 3 * 6 + 5 * x / 2 * 6 = 19 * 6;

2 * x / 1 * 2 + 5 * x / 1 * 3 = 19 * 6;

2 * x * 2 + 5 * x * 3 = 19 * 6;

4 * x + 15 * x = 19 * 6;

x * (4 + 15) = 114;

19 * x = 114;

x = 114 / 19;

x = 6 * 14 / 14;

x = 6 * 1 / 1;

x = 6;

Ответ: х = 6.