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

Найдем корни:

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.