1)1/3*(5/12-4м)=4/9*(1 1/2м-3/8) 2)0,3*(5х-7)=3*(0,2х+3,2) 3)(1,4х-3,5):0,25=(4,6х-18):(-1,5) 4)х+3=2

Найдем корешки.

1) 1/3 * (5/12 4* m) = 4/9 * (1 * m - 3/8);

Скобки раскроем.

1/3 * 5/12 1/3 * 4 * m = 4/9 * 1 * m 4/9 * 3/8;

5/36 4/3 * m = 4/9 * 3/2 * m 4/3 * 1/8;

5/36 4/3 * m = 2/3 * m - 1/6;

-4/3 * m + 2/3 * m = -1/6 5/36; 

-2/3 * m = -11/36;

2/3 * m = 11/36;

2/3 * 36 * m = 11;

24 * m = 11;

m = 11/24.

2) 0,3 * (5 * х - 7) = 3 * (0,2 * х + 3,2);

1.5 * x 2.1 = 0.6 * x + 9.6;

0.9 * x = 9.6 + 2.1;

0.9 * x = 11.7;

x = 117/9;

x = 13.

3) (1,4 * х - 3,5)/0,25 = (4,6 * х - 18)/(-1,5);

0.25 * (4.6 * x 18) = -1.5 * (1.4 * x 3.5); 

0.5 * (4.6 * x 18) = -0.3 * (1.4 * x 3.5); 

2.3 * x 9 = -0.42 * x + 1.05;

2.72 * x = 10.05;

x = 3.7.

4) х + 3 = 2;

х = 2 3;

х = -1;

Нет корней.