Реши уравнение: А)-4(х-5)-3(х+4)=1 Б)-4(х+2)+15х-(х+3)=-1 В)2,3(3-х)-4,5(2-6х)=22,6 Г)1/2(5х-0,4)-2(1/2х-2х)=5,3

Найдем корни.

А) -4 * (х - 5) - 3 * (х + 4) = 1; 

Скобки раскроем.

-4 * x + 4 * 5 - 3 * x - 3 * 4 = 1;

-4 * x + 20 - 3 * x - 12 = 1;

-7 * x + 8 = 1;

-7 * x = 1 - 8;

-7 * x = -7;

x = 7/7;

x = 1.

Б) -4 * (х + 2) + 15 * х - (х + 3) = -1; 

-4 * x - 8 + 15 * x - x - 3 = -1;

10 * x - 11 = -1;

10 * x = -1 + 11;

10 * x = 10;

x = 10/10;

x = 1.

В) 2,3 * (3 - х) - 4,5 * (2 - 6 * х) = 22,6; 

6.9 - 2.3 * x - 9 + 27 * x = 22.6; 

-2.1 + 14.7 * x = 22.6; 

14.7 * x = 22.6 + 2.1; 

14.7 * x = 24.7; 

x = 247/147. 

Г) 1/2 * (5 * х - 0,4) - 2 * (1/2 * х - 2 * х) = 5,3; 

2.5 * x - 0.2 - x + 4 * x = 5.3; 

5.5 * x = 5.3 + 0.2; 

5.5 * x = 5.5; 

x = 5.5/5.5; 

x = 1.