Решите Уравнения: 1. х+2,6=3,4 2. 6х=1,2 3. 3х-8=15 4. 6х-2(4х-1)=7 5.

Найдем корешки.

1. х + 2,6 = 3,4; 

x = 3.4 - 2.6;

x = 0.4 + 0.4;

x = 0.8.

2. 6 * х = 1,2; 

x = 1.2/6;

x = 0.2.

3. 3 * х - 8 = 15; 

3 * x = 15 + 8;

3 * x = 23;

x= 23/3.

4. 6 * х - 2 * (4 * х - 1) = 7; 

6 * x - 8 * x + 2 = 7;

-2 * x = 5;

x = -2.5.

5. 0,2 * х - 0,1 * (2 * х - 6) = 0,6; 

0.2 * x - 0.2 * x + 0.6 = 0.6; 

0 * x = 0;

Любые корешки.

6. х^2 = 4; 

x = 2; 

x = -2.

7. 5 * x^2 = 10; 

x = 10/5;

x^2 = 2;

x = 2;

x = -2. 

8. x^2 - 8 * x = 0; 

x * (x - 8) = 0;

x = 0;

x = 8.

9. 3 * x^2 - 2 * x + 4 = 0; 

D = 4 - 4 * 3 * 4 = 4 - 48 = -44;

Нет корней.

10. 5 * x^2 + 2 * x - 3 = 0; 

D = 4 - 4 * 5 * (-3)  = 64; 

x1 = (-2 + 8)/10 = 6/10 = 3/5 = 0.6; 

x2 = (-2 - 8)/10 = -1.