Решите уравнения 1.2(2+у)=19-3у 2.(4-с)+2(с-3)=-13 3.-3(3b+1)-12=12 4.3x=15 5.4x-2=14 6.3x+x+2=18 7.3x-12=x 8.4x-2=2x+6 9.2x-2=6+4x

Вычислим корешки:

1. 2 * (2 + у) = 19 - 3 * у; 

Раскроем скобки.

4 + 2 * y = 9 - 3 * y;

2 * y + 3 * y = 9 - 4; 

Приведем к виду a * x = b. 

5 * y = 5;

y = 5/5;

y = 1. 

2. (4 - с) + 2 * (с - 3) = -13; 

4 - c + 2 * c - 6 = -13;

c - 2 = -13;

c = -13 + 2;

c = -11.

3. -3 * (3 * b + 1) - 12 = 12; 

-3 * (3 * b + 1) = 24;

3 * b + 1 = -8;

3 * b = -9;

b = -9/3;

b = -3.

4. 3 * x = 15; 

x = 15/3;

x = 5.

5. 4 * x - 2 = 14; 

4 * x = 16;

x = 16/4;

x = 4.

6. 3 * x + x + 2 = 18; 

4 * x = 16;

x = 4.

7. 3 * x - 12 = x; 

2 * x = 12;

x = 6.

8. 4 * x - 2 = 2 * x + 6; 

2 * x = 8;

x = 4.

9. 2 * x - 2 = 6 + 4 * x; 

-2 * x = 8;

x = -4.

10. 2 * x + 6 = 4 * x - 2; 

-2 * x = -8;

x = 4.

11. -4 * x - 4 = 2 * x + 8; 

-6 * x = 12; 

x = -2.