Решите уравнения: 1)16-3=8х-43 2)-0,9(х-4)-3,3=0,6(2-х)2 3)х+3=3-х 3 8 4)(7х-2)*(7х+1,4)=0 5) (-2х-5)*(0,3+2,7)=0 В

Найдем корешки:

1) 16 - 3 = 8 * х - 43; 

13 = 8 * x - 43;

8 * x = 13 + 43;

8 * x = 56;

x = 56/8;

x = 7.

2) -0,9 * (х - 4) - 3,3 = 0,6 * (2 - х); 

-0.9 * x + 0.9 * 4 - 3.3 = 0.6 * 2 - 0.6 * x;

-0.9 * x + 3.6 - 3.3 = 1.2 - 0.6 * x;

-0.9 * x + 0.3 = 1.2 - 0.6 * x;

-0.9 * x + 0.6 * x = 1.2 - 0.3;

-0.3 * x = 0.9;

x = -0.9/0.3;

x = -9/3;

x = -3.

3) х + 3 = 3 - х; 

x + x = 3 - 3;

2 * x = 0;

x = 0.

4) (7 * х - 2) * (7 * х + 1,4) = 0; 

7 * x - 2 = 0;

7 * x + 1.4 = 0;

7 * x = 2;

7 * x = -1.4;

x = 2/7;

x = -1.4/7;

x = 2/7;

x = -0.2.

5) (-2 * х - 5) * (0,3 + 2,7) = 0; 

-2 * x - 5 = 0; 

-2 * x = 5; 

x = -5/2; 

x = -2.5.